Relay to drive 1500watt load

Discussion in 'The Projects Forum' started by shan90, Dec 28, 2013.

  1. shan90

    Thread Starter New Member

    Dec 28, 2013
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    0
    Could somebody help me selecting a 6Vrelay to drive 1500watt load. I mean the ratings for the relay that must be used??
    Actually I have designed a thermostat circuit to which I have connected a 1500watt heater. As i switched on the thermostat, and as it switched off the heater first, the heater coil started fluctuating and burned out. The relay I used was simple electronic relay used in low power circuits
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    What is the voltage of the heater?
     
  3. shan90

    Thread Starter New Member

    Dec 28, 2013
    2
    0
    220V Ac supply
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    Do you have the schematic of your thermostat?
    Perhaps you could build-in a hysteresis.

    Bertus
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    2,367
    If it is 6v to drive it, look at a Opto22 SSR.
    Max.
     
  6. #12

    Expert

    Nov 30, 2010
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  7. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
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    It could burn out the thermostat heater!

    But then that would really be wrong. Using a thermostat with a heat anticipator to switch a 6 amp load.:eek:
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,770
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    What is the "heater coil"? Is this part of a fan motor, or a solenoid valve, or .....?
    Clearly the relay load is at least partly inductive, so the relay will need to be rated accordingly for switching such a load.
    You mention a "simple electronic relay". Is that an SSR?
     
  9. Ragwire

    Member

    Dec 9, 2013
    36
    1
    Is the 6V coil voltage AC or DC?
    You could probably use a garden variety 2 pole contactor for a central air condensing unit as long as the ratings are OK. You would still need something like a 40VA, 24VAC output transformer to generate the contactor coil voltage and a smaller, 6V (AC or DC, as needed) coil relay just rated to switch the 24 VAC to the contactor coil.
     
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