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Should a relay get warm?

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  • 29-04-2012 6:20pm
    #1
    BrokenArrows
    Registered Users Posts: 7,498 ✭✭✭


    I have wired up something for my motorbike. Part of it is a relay which is triggered when I turn on the bike.

    The relay starts to get warm if the circuit is open for around 5 minutes.

    It's a 40amp relay. The battery its connected to is 12volts.

    Should it be getting hot?


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    #2
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    BrokenArrows wrote: »
    I have wired up something for my motorbike. Part of it is a relay which is triggered when I turn on the bike.

    The relay starts to get warm if the circuit is open for around 5 minutes.

    It's a 40amp relay. The battery its connected to is 12volts.

    Should it be getting hot?

    What are you running through the relay? Its not unusual for them to get a bit warm.


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    #3
    BrokenArrows
    Registered Users Posts: 7,498 ✭✭✭BrokenArrows


    robbie7730 wrote: »
    BrokenArrows wrote: »
    I have wired up something for my motorbike. Part of it is a relay which is triggered when I turn on the bike.

    The relay starts to get warm if the circuit is open for around 5 minutes.

    It's a 40amp relay. The battery its connected to is 12volts.

    Should it be getting hot?

    What are you running through the relay? Its not unusual for them to get a bit warm.

    Just a usb port to charge my phone but it gets warm even when the phone is not connected so should not be drawing a current.


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    #4
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    BrokenArrows wrote: »
    Just a usb port to charge my phone but it gets warm even when the phone is not connected so should not be drawing a current.

    The relay coil itself will still be powered once it has the 12v to it, even if the item you have powered through the relay contacts is not connected.

    The relay coils do warm up a little.


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    #5
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    Yea they can get warm, if you look up coil power ratting its probably a watt or so, so would feel slightly warm. Shouldn't be hot as such.


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