Picking the right relay

Discussion in 'General Electronics Chat' started by Tim Blevins, Aug 15, 2016.

  1. Tim Blevins

    Thread Starter New Member

    May 27, 2016
    4
    0
    I need a 12 volt DPDT relay. I am using it to reverse polarity on four electric actuators operating in unison. Maximum amp draw on the actuators wired parallel is 5 amps each under a heavy load. I think I need a relay that can handle a minimum of 20 amps @ 12 volts.

    For Instance this description:
    • Coil Voltage: AC 12V;
    • Contact Capacity: AC 240V/10A, DC 24V/10A
    • Type: DPDT(2NO 2NC);
    • Pins: 8 Pin;
    • Mount Type: 35mm DIN Rail
    My question is on contact capacity.
    Contact Capacity: AC 240V/10A, DC 24V/10A

    What should I be looking for here to be adequate for the 4 actuators?? DC 24V/40A ? Or More ?
    I just need an adequate relay with socket that will mount on a DIN rail to operate the 4 actuators.
    The one above has been working adequately but I feel it may not be durable enough
    Any suggestion would be great.
    Thanks

    https://drive.google.com/file/d/0B_auNJuo7alIZ2liRHJNOVhLMjg/view?usp=sharing
     
  2. marcf

    Member

    Dec 29, 2014
    137
    19
    You may want to inspect your attached schematic diagram. It appears that when the relay is activated, a short will exist across the battery.

    Also, you may want to use the 'standard' schematic symbol for a DPDT relay.

    The actuators, being inductive should have a suppression diode across them, as should the relay coil.

    Also it is a good idea to connect the load across the C(ommon) contacts and the Power source to the NO NC contacts.
     
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