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You are here: Home / Electronic Components / High Current Triac BTA41/600B – Datasheet, Application Note

High Current Triac BTA41/600B – Datasheet, Application Note

Last Updated on December 3, 2020 by Swagatam 122 Comments

Triacs are one of the most important active electronic components which are exclusively used for power switching applications, these devices are especially suited to AC mains loads, and are able to switch large currents consistently.

Triacs are the solid state replacements to mechanical relays, and come configured as static relays.

The modern triacs today are high sophisticated with their specifications and make, one such example is the BTA41, 600B, let's understand its technical specification and datasheet from the following points:

Identifying Print Value of BTA41/600B

  • BT indicates series number,
  • "A" represents that the device is insulated, while B would mean non-insulated. The insulation is provided on the Tab of the device upto 2500 volts.
  • 41 = 4 and "one" zero, that equals 40 Amps
  • 600 is the voltage handling capacity, therefore here it's 600 volts.
  • B represents the triggering sensitivity that's 50mA in this case
  • Absolute Maximum Rating (at around 25 to 40 degrees Celsius)
  • RMS, continuous current handling capacity = 40 Amps
  • Non repetitive peak current = 400 Amp, only for max 20ms.

How to Connect

The pin outs are connected just as we connect other normal triacs. Let's learn them yet again:

A1 should be always connected to ground. The ground doesn't have to be necessarily the neutral of the AC, it can be any one wire out of the two mains input. The other wire will go to one of the load terminals, while the second wire of the load will go to A2 of the triac.

The gate should be connected with the desired trigger input which must be a DC, because the triac will conduct with every rising positive edge of the DC trigger. Here the minimum triggering gate current is 50 mA.

A1 should be made common with one of the AC terminals as well as the ground of the DC trigger circuit, in case an external triggering circuit is incorporated.

Application Notes

As suggested in the above sections, the triac BTA41/600B is best suitable for applications concerning control of AC loads such heater coils, high power halogen lamps, AC motor pumps or simply motors such as in dryers, blowers and so forth.

The following circuit illustrates how the device may be utilized for controlling heater coils such as in furnaces,  induction cookers etc.

The above circuit can also be used for controlling AC motor speeds simply by replacing the heater coil with the motor wires.

The adjoining diagram depicts another application of BTA41/600 where it has been configured as a PWM assisted AC motor controller or even heater coils.




Previous: Voice/Audio Recorder Playback Circuits
Next: Automatic Door Lamp Timer Circuit

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Search Related Posts for Commenting

  2. dylan says

    Hi Swagatam,
    Thank you for the article. I learn something new today. However, I have case and wonder if you could help. I bought a spot welder control module from Amazon. The module can also be seen on aliexpress.com. The issue is every time, I hit the trigger, my circuit breaker tripped. The module uses the “BTA100-800b” . I wonder if I could use the chip BTA41/600B to resolve this issue. My home panel is 100A max. Each breaker is 15A or 10A. Thank you very much.

    Reply
    • Swagatam says

      Hi Dylan, The tripping is happening due to over current drawn by the welding output load. BTA100 is just a switch which is rated according to the load current, so the 100 indicates its maximum tolerable current limit which is 100, which also means that a BTA41 will handle only 41 amps. So if you replace the 100 with 41, it may quickly burn due to the excess current above its tolerance limit.
      If you think the welding machine is correctly producing the 100 amp for a 100 amp output load, in that case you may have to upgrade the tripping limit of the controller from 10A to 100A or as suitable, instead of replacing the triac.

      Reply
  3. Edyrakh says

    Hi Swag,

    What is the consequence if I don’t use choke?

    Reply
    • Swagatam says

      Hi Edyrakh, the circuit will still work, but will generate a lot of RF noise in the atmosphere which may create disturbance in radios or other wireless equipment.

      Reply
      • Edyrakh says

        Can I use the circuit for higher current of triac like BTA100-800b?
        I need to control temperature of various length of nikelin strip that I use to cut artificial fur. Curently I use autotransformator. The voltage that I use between 5V to 70V with maximum current of 30A.

        Reply
        • Swagatam says

          you can do it but if your load is rated at 70V then it can be risky to use this circuit with 220V input, because the 300 peak voltage from the AC can damage your load. You can use the above circuit for controlling 220V load

          Reply
  4. Dang Dinh Ngoc says

    Hi Swagatam,
    I am trying to get calculation for correct value of resistor for triac. As you guided above, look at datasheet and gate current Vgt (12V), Igt (50mA) >> R= 240 Ohm. I also found another person talking about this using the Peak current and R for the gate is calculated by R= V*SQRT(2)/Ipk = 220*SQRT(2)/8Amp=38.8 Ohm.
    Actually, I will use your approach, however, the provided guideline is here (for minimum value of Ohm for gate resistor)
    https://www.onsemi.com/pub/Collateral/AN-3003.pdf.pdf
    Apply for the case of BTA 12, I did not see the parameter for Vg but the test sheet with applied Vg 12 (Max) Ig 50mA and this make me a bit confuse on how to calculate the required resistor value for gate.
    Please take a bit of time to show me.
    Using your guidance, I found the safe ohm value should be 240 Ohm also.
    Thank you very much for your attention.
    From Vietnam

    Reply
    • Swagatam says

      Hi Dang, yes it is definitely not dependent on the Vg parameter, rather solely on the IGT which is the triggering current for the specific triac at a given ambient temperature.

      I have discussed the subject elaborately in the following article, which you can refer below, to get a simpler idea regarding how to select the gate resistor for any triac….just by using Ohm’s law

      https://www.homemade-circuits.com/triac-circuits-working-and-application/

      Reply
  5. N. B. Panjwani says

    Hi, I’m interested in building a SSFR (Solid-state fan regulator) for old model ceiling fans. I thought of using BTA41/600B instead of BT136/BT137. As BT136/BT137 gets damaged in circuit mentioned at url https://www.homemade-circuits.com/how-to-make-simplest-triac-flasher/ Please suggest suitable changes to be made in your above circuit mentioned in the url https://www.homemade-circuits.com/how-to-make-simplest-triac-flasher/.
    Thanks

    Reply
    • Swagatam says

      Hi, BT136 is also a good triac and will not blow if the load is around 200 watts and the triac is mounted on a heatsink.

      BTA41 can be used for 1kv and above loads with a heatsink. No changes in the circuit would be required for this.

      Reply
      • Evans says

        Hello sir swagatam,av been thinking of including a triac in my Inverter charger to control charging currents since my Inverter uses mosfets body diodes for charging and mosfets doesn’t have current control capabilities,are my thoughts right? And if so then suggest for me the best triac that can control charge current to my batteries. Av got 2 batteries rated 12/200Ah connected in series but am planning to add the batteries as time goes by. So any triac u suggest to me should be able to handle high current even if the batteries are increased. Also I’ll really appreciate if you help with aid of a diagram, thanks in advance.

        Reply
        • Swagatam says

          Hello Evans, triacs cannot be used for controlling current with DC supplies, since they will latch permanently ON when triggered, and will not switched OfF until the supply source is switched OFF

          Reply
          • Evans says

            Oh,got you sir. Do you have any in mind that I can use to control charging current in my Inverter?

            Reply
            • Swagatam says

              Evans, current control is supposed to be implemented using the shutdown feature in the oscillator IC, if it is provided in it. If not then you can try the following concept:

              op amp current limiter circuit

            • Seun says

              Good day sir, please I want the full article for the diagram on MOSFET over current control.thanks

            • Swagatam says

              Seun, the explanation is very basic. When current exceeds the set threshold, the voltage across the resistor Rs at the + input of the op amp surpasses the reference level at – pin of the opamp, causing the op amp output to become high, which grounds the MOSFET gates via the BjT shutting them off

          • Evans says

            Thanks for the concept sir,the values not given any help?

            Reply
            • Swagatam says

              for 12V battery the zener can be 3V, and the zener resistor can be 1k. The zener value becomes the Vref, which is shown in the formula for calculating the value of Rs. The value of I will depend on the desired maximum current limit

  6. Anshuman Aggarwal says

    Swagatam,
    Any suggestions on how to connect the Triac to a high current load. If there is a 4 sq mm wire for 25-30A AC what is a recommendation on how to connect the Triac to that.

    Reply
    • Swagatam says

      Anshuman, If you are referring to the circuit shown in the above article, then it has to be connected where the heater is shown, while also ensuring that the associated cables are rated accordingly.

      Reply
  7. Avong says

    hi Swag
    I really learned alot from your tutorials.
    i wish to ask about BTA41, can it be driven by A.C just like others triacs?
    i mean, trigger it using MOC3033 (A.C).
    i asked because you said it must be trigger by D.C.

    Reply
    • Swagatam says

      Thank you Avong, Triac Gate pin always work with a DC, while the MT1, MT2 pins work with AC. MOC also delivers a Dc to the gate of the external triac.

      Reply
  8. Stefano says

    Sir,
    thanks for share your knowledge. I have a question about the right side of the circuit,what is the function of the resistor (100 ohms) and of the capacitor (0.1 uF, 630V). I am especially refering to the difference with the similar circuit: (secod scheme of https://homemade-circuits.com/how-to-make-simplest-triac-flasher/).
    Thanks in advance
    Stefano

    Reply
    • Swag says

      Stefano, it is called snubber network, which helps to safeguard the triac from high current spikes, especially when an inductive load is used.
      However nowadays most triacs have this feature in built.

      Reply
      • Ijalana says

        Sir pls I need booster for iron

        Reply
        • Swagatam says

          Try the second circuit from this article

          https://www.homemade-circuits.com/generatoralternator-ac-voltage-booster/

          Reply
  9. Hamid Hussain says

    Thanks sir for your kind reply for using ac load for triac I have powering the timer 555 with the 5 volts want to flash 60watt bulb through triac but its burning the resistor which is placed at output of 555 timer which is 3 pin out of timer please sir you have also not answer about driving thread mill dc motor 180volt 10amp driver ckt thanks

    Reply
    • Swag says

      THe pin#3 resistor must be at least 1 K rated. Please use a 1K resistor and connect the triac with the correct pinouts, and make sure the MT2 of the triac has a common connection with the IC 555 ground line.

      I have already given you the link for the 180V driver circuit in your previous comment.

      Reply
      • Hamid Hussain says

        Thanks sir I have used 1 kilo ohm for the triac bt137 but still the square wave coming from the timer is stopping at one end of resistor help me this my project of triggering gate of triac using timer I have already used relay which is working can you please show me the calculation of gate triggering resistor for any DC supply thanks once again

        Reply
        • Swag says

          Hamid, the triac gate resistor is not so critical, any value between 330 ohm and 2k2 should work. make sure you have connected the triac pinouts correctly. center pin will go to the lamp, right side pin is the gate, and the left side pin will go the lamp

          Reply
  10. Hamid Hussain says

    Sir i have a question regarding the 555 timer output can the pin 3 of timer can be given to the gate of the triac bt 137 bt 136 in order to achieve flashing the 220 volts 60 watt bulbs a resistive load if so what are the voltage should i used to power up the timer its either 5 volts or higher what current should i used what should be the resistor value should i used to limit the gate triggering current and voltage can i use opto isolator also called as opto coupler Today i have used the 555 basic alternating flashing ckt i have constructed on veroboard i have given the the output to the triac bt137 which is having 50ma of gate triggering current but some how the ckt is not working the leds are flashing but the gare of traic is not triggering please give me proper guide lines how to trigger triac easily in experiment i have used 330ohm quarter watt resistor which indeed not working what should be the resistor value for triggering bt137 Waiting for your reply

    Reply
    • Swag says

      Hamid, for the IC 555 timer you can use 12V DC. Triac cannot be ud for DC load such as LED, that is why your triac is not working. for triggering the triac a 1K resistor will be OK, but the load and its supply should be AC not DC

      Reply
      • Hamid Hussain says

        Thanks for your reply

        Reply
      • Hamid Hussain says

        Thanks

        Reply
  11. just_humble says

    Hi Swagat Sir,
    I want to control a 12v, 100 watts resistive load from a digital signal. What would be the right control element to use?
    Can I use the same triac used here?
    This is for my headlamp on my bike. I upgraded the bulb to 100watts from 50watts, but the switches won't take that heavy current. Can you advice me please?

    Reply
    • Swagatam says

      Hi just humble,
      triac cannot be used for controlling a DC load, you can use a mosfet for example an IRF540 for this application.

      connect positive supply through your switch to the gate of the mosfet.
      connect source of the mosfet with the ground line.
      connect the LED negative with the drain of the mosfet.
      connect the positive of LED with the positive of the battery.

      also do not forget to connect a 10K resistor from gate to source of the mosfet.

      Reply
      • Hamid Hussain says

        I have a 2 hours power 180 volt dc motor I want to control speed control circuit if so kindly guide me waiting for your reply

        Reply
        • Hamid Hussain says

          Salam Sir i have recently asked you a question i want a complete circuit diagram for dc motor thread mill 180volt 2 hp you have asked about using a mosfet for controlling dc motors i need this urgently please help me in this regard

          Reply
  12. Hari Nair says

    Dear Swagatham,
    I have been following your work since the last few years and you are simply unbelievable…your passion and energy has not dimmed a bit all these years and posts later…how do you manage to eat, sleep and make a living?! How can you go on writing, replying(to some occasionally stupid questions too!), providing links and that too in the simplest of terms(the language is really good)…man-you are an inspiration,a one-man inspiration-army!
    May the gods give you the best!
    Prayers and warm wishes to you!
    Dr.Niranjan
    nirugnair@yahoo.com

    Reply
    • Swagatam says

      Thank you very much Dr.Niranjan, as you rightly used the word "passion" that's exactly what helps me to keep going with the present job without tiring….and when one of the valuable viewers like you appreciates me that further boosts by inspirations.

      I wish you too all the best, and may God bless you!

      Reply
  13. Unknown says

    Hello Swagatam…It's very nice info that I get..

    I've plan to make DC rectifying from 220 volt without transformer…And I need DC range from 20 to 100 voltDC..

    if I use your schematic, what the suitable value of pot and resistor ?

    Thanks a lot master…

    Reply
    • Swagatam says

      thanks very much, but sorry the above concept cannot be used for controlling AC voltage levels….you will have to employ some other circuit or a variac for achieving this.

      Reply
    • Arif rezoN says

      hello mr.. thanks for your fast reply.

      I have think before about use variac to regulating and controlling my voltage,, but its too expensive to buy it,, hehe,,
      then I try googling to find information about transformerless supply.

      By the way, i've just read your "treadmill-motor-speed-controller-circuit"
      and it said that
      "a modified dimmer switch circuit design which can be effectively used for regulating a 180 V treadmill motor from zero to max"

      may it control voltage from zero to 180 volt ?

      thank a lot for your support Mr.

      Reply
    • Swagatam says

      yes I recommended the design for treadmill motor since its spec 180V is quite near to 220V, but ideally it is not recommended to use a dimmer switch for controlling voltage.

      But nevertheless you can surely try it and check whether it satisfies your application condition or not.

      Reply
    • fira nozer says

      Dear Mr.Swagatam
      I have done with it..

      First one.. I connect dimmer output to bridge rectifier and 330uF Ecco..but my fuse has blown cause charging huge current.. and then I remove elco and I test it using 100watt bulb lamp..

      It's great..your circuit works well.
      I've upload the test run video at YouTube. "test run Dimmer circuit using triac bta41-600"

      Thanks again Mr.Swagatam for your knowledge share…

      Reply
    • Swagatam says

      Thank you dear Fira, I am really glad to hear your experience with this circuit….keep up the good work

      Reply
  14. Swagatam says

    you can probably try the following concept

    https://homemade-circuits.com/2016/05/mini-welding-machine-circuit.html

    Reply
  15. rohit pandey says

    thank you very muchh swagatamji for your support.

    Reply
  16. rohit pandey says

    thank you swagatamji, my load is purely resistive in nature.
    i have connected MCB at input side for heavy current trip during short circuit. the problem is when light gets fused then sometimes it get short and result in damage of triac because of short circuit.

    i switch on thew light when pot was at max directly many times and still it working fine. now i am using this circuit till 4kw.

    i made 2 triac in parallel but only 1 triac is working, even i gave gate input through diff diac(but from same origin). Only few times both work together. i checked current through clamp meter on each triac.

    Reply
    • Swagatam says

      Hello Rohitji, triacs in parallel will never work since their firing characteristic will mostly, causing one of the triacs to fire before the other, therefore they will never fire together.

      If a short circuit is a possibility then definitely an MCB is the right option, and it must be included.

      Reply
  17. Unknown says

    hello Swagatamji thanks for your circuit.
    Can i used this circuit for lightning application for power around 7.5kW @230V input.
    And circuit to be added for short circuit protection for TRIAC.
    is bidirectional Transil diode required for protection.
    pls help.

    Reply
    • Swagatam says

      Hello,

      yes you can use the first circuit for your specific application. Use a large heatsink with the triac and make sure that the circuit always switched ON while the pot is set at the minimum side of the dial…onec switched ON then it could be adjusted to the required intensity.

      The lights should be resistive in nature, LEDs will not work

      an appropriately rated fuse could be added for the protection, other forms of protection may not be required.

      Reply
  18. Choirul Anwar says

    hello sir
    if i want to make a constant temperature control at 80 degrees celcius from second circuit above. what should i modificate from circuit or add thermistor my be
    thanks

    Reply
    • Swagatam says

      hello choirul,

      if the input mains is not fluctuating then simply setting the given pot control will allow you to achieve any desired temperature level at a reasonably constant rate

      Reply
      • Hamid Hussain says

        salam sir i have a question in my mind That how much current is required to trigger a relay havibng 5volts 6 volts any idea How to calculate total current current required by relay

        Reply
        • Swag says

          Hello Hamid,

          you can get the full explanation under this article

          https://homemade-circuits.com/how-to-make-relay-driver-stage-in/

          Reply
  19. Abdul Wahab says

    Hi! Swagatam,
    Can I use this circuit to make 110V dc from 220V rms ac after usinf triac and rectifier?
    I am trying to make a 36V battery charger ofat least 6 to 7A and I am trying not to use transformer. Is it possible.

    Reply
    • Swagatam says

      Hi Abdul, it is possible but is strictly not recommended for battery charging, because if the triac or the circuit fails at any instant, there could be an explosion in the battery and a catastrophic hazardous situation

      Reply
  20. christina says

    hi! swagatam,
    how do i select the heatsink for this triac (BTA41600b),
    trying to switch a 4hp pump, with this.

    Reply
    • Swagatam says

      Hi Christina, calculating it could be complicated. Better to do it by some practical experiment, in general use the largest possible heatsink to the device for providing maximum cooling…

      Reply
    • christina says

      thanks! Swagatam.
      will try some available options.

      Reply
  21. Abid Hussain says

    can we use this bta41 circuit as a steplizer

    Reply
    • Swagatam says

      no

      Reply
  22. Atinuke Funke says

    Pls How Will I Calculate The Appropriate Resistors(including The Watts) And Capacitors For The Correct Amps And Volts Rating Of A Triac When Constructing

    Reply
    • Swagatam says

      the optimal gate current of BTA41 is 50mA, at 12V.

      you can Ohm law for calculating this

      V= IR

      12 = 0.05 x R

      R = 240 ohms

      any value slightly lower than this can be used as the gate resistor for the BTA41

      Reply
      • Hamid Hussain says

        Sir i have also experimented from the bt137 triac Can you please guide me how to trigger the gate of traic properly i have a dc supply of 9 volts i want to switch on the traic through the 555 timer is this possible if so kindly also help me in this regard waiting for your reply

        Reply
        • Swag says

          Hi Hameed, you can use the following circuit

          https://homemade-circuits.com/make-this-pwm-based-dc-motor-speed/

          triac will not work for DC motors, you will have to use a mosfet based PWM driver as explained in the above link

          Reply
    • Swagatam says

      multiply 12 x 0.05 for getting the resistor wattage

      Reply
    • Atinuke Funke says

      Thanks so much Engineering Genius – Swagatam . You have made engineering so easy for me, more grace to your elbow

      Reply
    • Atinuke Funke says

      pls sir, what about how to calculate the appropriate capacitor for BTA41

      Reply
    • Swagatam says

      thanks Atinuke,

      which capacitor are you referring to?….. the one connected between its MT1 and MT2 is not actually required because the triac is internally protected with a snubber stage.

      Reply
  23. Atinuke Funke says

    Thanks Sir,does Bta41-600 Supply 40amps And 600v To The Appliance Wont It Damage The 2hp Motor

    Reply
    • Swagatam says

      The specs are the maximum breakdown limits of the device, it will supply only what is consumed by the load, and as per the input power.

      Reply
  24. Atinuke Funke says

    Hi sir, pls are scr and triac the same and do they have the same mechanism of operation. Between BTA41-600B and BTA16-800 can we say they have the maximum rating of 24,000va and 12,800va respectively. can either be used to power a 2,200va heater without damage to the heater, what will be there power consumption and their efficiency rate. can BTA41-600B be used to power a 2hp electric pump.for BTA41-600B can we say it supplies 40amps and 600v into appliance.since there are diff thyristors, what will be the criteria of choosing the appropriate one for the right rating for an appliance. Well done sir ,you have been greatly resourceful, please attend to all my questions. thanks

    Reply
    • Swagatam says

      Hi Atinuke,

      your calculations are correct according to me, but the devices will need to be mounted on substantially large heatsinks to implement those figures.

      220va heater and 2hp motor can be operated using BTA41 triac

      all thyristors and triacs basically work in the same way, there are distinguished by their amp and volt ratings including some other factors such as built-in snubber, and other protections…..however today most of these devices are on par with each other, so only their I and V rating needs to be considered while selecting those.

      Reply
  25. MUJAHID SHAH says

    Sir one of your "Simple Dc motor speed Controller" circuit configured around ic 555
    if I use this PWM circuit to drive the Triac to control heating. Is it okay

    Reply
    • Swagatam says

      Yes it will be OK…but I would recommend an optocoupler for this, for example using a MOC optocoupler would make things extremely safe and accurate

      3.bp.blogspot.com/-4dY_nPZyFGk/VXveLFjql3I/AAAAAAAAKbc/mJzqWjJt2xg/s1600/triac%2Bpwm%2Bdriver.png

      Reply
  26. MUJAHID SHAH says

    Sir if I build the PWM circuit with 555 ic as designed by you and control it with a separate 12dc supply
    and make these two supplies (12dc and 220 AC ) common and connect pin three to Triac gate
    will it do?

    Reply
    • Swagatam says

      Mujahid, yes that will be required for proper functioning of the triac, and is OK, but make sure you don't touch the circuit because it will be at the mains potential and extremely lethal..

      Reply
  27. MUJAHID SHAH says

    Kindly explain the PULSE WIDTH MODULATION as I don.t know about it. What is its function in the above circuit

    Reply
    • Swagatam says

      a pulse is a momentary application of a voltage for a selected duration of time, say for 1 second…if this pulse is alternately switched ON and OFF and the ON/OFF period is varied as per the user preference, then it is said to be a pulse width control…and if this ON/OFF period is varied corresponding to another signal's variation then it's called pulse width modulation since the pulse is being modulated by another signal….

      Reply
  28. MUJAHID SHAH says

    a Triac can be used for three phase supply?

    Reply
    • Swagatam says

      yes it can be used

      Reply
  29. MUJAHID SHAH says

    The motor should catch its speed to its peak "Slowly & Automatically "
    that.s what I want to know

    Reply
  30. MUJAHID SHAH says

    What PWM stands for?
    Second

    sir my previous question was incomplete, let me complete it. I want my AC motor to catch its speed slowly and it should be AUTOMATICALLY. you recommeded the PWM one with ic 555. Can it be AUTOMATIC as well

    Reply
    • Swagatam says

      Pulse Width Modulation

      yes the referred circuit will do exactly that!

      it'll automatically allow a slow start for the motor on every power switch ON.

      Reply
  31. MUJAHID SHAH says

    What is CMOS IC ?

    Reply
    • Swagatam says

      ICs made using CMOS technology, these ICs have the characteristic of a high input impedance, and always produce either a high (1) or a low (0), never anything else

      Reply
    • Swagatam says

      …and always produce either a high (1) or a low (0), never anything else at their outputs, when powered

      Reply
  32. MUJAHID SHAH says

    I have a 1Hp 220v AC motor. I want it to catch its speed slowly.
    Is it possible with the above circuit if yes then how? And
    Will it be safe?

    Reply
    • Swagatam says

      not the above circuit…you can use the "PWM soft start motor start circuit" which is posted in this site itself.

      Reply
  33. MUJAHID SHAH says

    Sir I want my exhaust fan(AC) to increase its speed as the temperature in kitchen increases and decrease its speed as the temperature decreases
    is it possible with the above circuit

    Reply
    • Swagatam says

      Mujahid, it's possible, but by including a temperature sensor with the circuit, such as a LM35 sensor or similar.

      although a little different, I have a related circuit posted in this blog, you can check it here:

      https://homemade-circuits.com/2013/01/automatic-temperatureclimate-controlled.html

      Reply
  34. MUJAHID SHAH says

    If I want to trigger the Triac with the mains AC then what should be the resistor value for 220v AC for 50mA gate current

    Second

    The speed of a motor or heater temperature is controlled manually by increasing or decreasing resistance, sir is it possible this thing happens automatically.
    I mean I want to control this resistance automatically how is it possible? So that the temperature or motor speed increase automatically without any manual work.

    Reply
    • Swagatam says

      use Ohms law to calculate the resistor.

      it's not possible to control a triac output with a variable resistor, you will require either a PWM or a phase chopper circuit for that, as explained in the article above.

      Reply
  35. Amar T says

    Hi,

    That part is very old part, And that is not available in online markets and local market. Can u please suggest any other alternative with regular make. Or suggest me for any alternative designs for 100A solid state relay.

    Reply
    • Swagatam says

      I think you should inquire with your local spare part dealer or in the local market for knowing exactly which one may be available…or you can also Google for the same and buy it online, any 600V 100amp triac will do the job

      in other alternative design too the triac will need to be 100amps as per the required specifications.

      Reply
  36. Amar T says

    Hi Swagatham,

    Am planning to design Solid State relay 100A capacity.

    Voltage range is 90 to 264Ac.
    Can u please tell me the part number of triac which is withstands 100A.

    Reply
    • Swagatam says

      Hi Amar,

      you can try the TSR100AA60 it's rated to withstand 100amp at upto 600V

      Reply
  37. Swagatam says

    you can do it by adding a temperature sensor with the circuit as shown here:

    https://homemade-circuits.com/2011/12/make-simple-refrigerator-thermostat.html

    the transistor emitter parts along with the triac is not required and can be removed, the power supply section can also be eliminated as we already have it in the above design

    the transistor collector can then be connected with pin5 of the IC 555 and emitter to ground.

    Reply
  38. Swagatam says

    one method is to connect a 1k resistor across pin5 and ground.

    next, connect a BC547 transistor and connect its emitter to pin5, collector to positive, and its base with a parallel link from positive immersed in water.

    as long as water is present the BC547 will conduct and keep the heater hot, and switch OFF the IC 555 in the absence of water.

    Reply
  39. Swagatam says

    Hi Mikel,

    It's possible but what would be the sensing parameter? this will need to be figured out first…

    Reply
  40. Swagatam says

    Hi Mikel,

    yes you can use the designs for controlling all types of heater devices.

    the 40uH is actually not required, it's included to cancel out the RF emissions or disturbances in the air, alternatively you can easily build it by winding 200 turns of 1mm copper magnet wire over an iron bolt

    for the second design you can use a 100k instead of the shown 220k, but not 500k

    Reply
  41. Eric Woodring says

    What would be the benifit of the PWM ckt over the first Triac control ckt above?

    Reply
    • Swagatam says

      both will vary the RMS effectively…the second circuit will provide slightly more reliable results since it's not dependent on diac's not firing issues

      Reply
  42. Okafor Joseph says

    Hi i wanna build a power control circuit that can power 1000-2000 watts load from a 650 watts 230 voltage source.
    Please Sir help me with the circuit diagram.
    THANKS!

    Reply
    • Swagatam says

      How can you obtain 2000 watts from a 650 watt source?? That's not possible.

      Reply
  43. Mrunal Ahirrao says

    thank you very much. I'll see if I get one locally… as the BTA41 600B is availabe so i purchased it.

    Reply
  44. Mrunal Ahirrao says

    Hi swagatam,
    I wanted to use this triac for AC motor pump control whose load may vary from 3A to 10A. And I am quiet to new to Triacs,especially snubber circuit design,so will you please help me in designing snubber for that load? Thank you.

    Reply
    • Swagatam says

      Hi Mrunal,

      The modern triacs do not require snubbers, they have built-in protections, you can get more info about the part numbers in the following ink:

      http://www.st.com/web/en/catalog/sense_power/FM144/CL1221/SC124/LN1596?icmp=ln1596_prom_sc124promo_dec2013

      Reply
  45. chris milan says

    Hi Swagatam
    How many watts do i need for resistor?

    Thank you

    Reply
    • Swagatam says

      Hi Chris,
      all are 1/4 watt rated

      Reply
    • chris milan says

      thank you very much,
      i think that circuit is good for preheater

      Reply
    • Swagatam says

      you are welcome chris.

      Reply
  46. Celso says

    OK Sir Swagatam Majumdar. Very grateful for the attention and response. Did not think my question would return. I will replace the potentiometer 470K to 220K and return of the information. Hugs Celso Castro. English translated by Google.

    Reply
    • Swagatam says

      You are welcome!

      Reply
  47. Celso says

    Salvador, Bahia, Brasil 24.08.2013.

    Swagatam Majumdar

    Como faço para modificar os circuitos do BTA 41 de 220v para 127v?
    Agradeço pela atenção e se for possivel responder.

    Saudações,
    Celso Castro

    Traduzido do Inglês para Português pelo Google

    Salvador Bahia Brasil, 24.08.2013

    Sir Swagatam Majumdar

    How do I modify the circuitry of BTA 41 220v to 127v?
    I appreciate the attention and if possible answer.

    Regards,
    Celso Castro

    Reply
    • Swagatam says

      Hi Celso,

      You can use the above design with 127V also, just replace the shown 470K pot with a 220K one.

      Reply
    • Celso says

      Swagatam Majumdar, grateful for the guidance. I replaced the potentiometer of 470k to 220 k lin, 330k to 220k resistor.It ran on 120 volts and this perfect today. I had to get away and could not answer.
      Thank you, Celso Castro – Salvador – Brazil. 06/30/2015. Google translator.

      Reply
    • Swagatam says

      that's great Celso, I am glad to hear this…thanks for updating the info.

      Reply
  48. Jootah says

    Hi, I'm interested in building a SSR (Solid-state relay) for use with Arduino, I thought of this uitllizar BTA41/600B
    I have a circuit [api10.net/rele_diagrama.jpg] (if you can access and view, thank you). I'm using a MOC3021.

    My question is: This circuit the way it is, it is safe to 40A?

    Thank You

    Reply
    • Swagatam says

      Yes it is safe, but will require good heatsinking and at least 50mA of gate current.

      Reply


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