two switch circuite

Discussion in 'The Projects Forum' started by frank.scott, Nov 21, 2012.

  1. frank.scott

    Thread Starter New Member

    Nov 21, 2012
    I have two thermal switches that are at different temperatures.
    I need to turn on a motor with the higher temp switch and turn it off with the lower temp switch. I have considered flip flops but don't don't know how to get by the not allowed state.
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    Please answer the following questions:

    Are these NO or NC switches? (NO normally open, NC normally closed)
    What is the current carrying capability of these switches?
    What motor do you want to switch? DC, AC? What voltage, what starting current?
  3. williamj

    Active Member

    Sep 3, 2009

    Assuming (as praondevou inquired) all things are sized appropriately, the motor can be wired using two thermal switches. But without knowing the types of switches and the size of the motor you have we can't give you any appropriate suggestions.

    But do consider using just one switch, a "close on rise" thermal switch should take care of your stated requirements. Depending on the size required, most of these thermal switches aren't that expensive.

    As the temperature rises the contacts will close and will energize the motor. As the temperature lowers the contacts will open and de-energize the motor.

    The simpler and less complicated something is the fewer things there are to go wrong.

    just a thought,