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Old Nov 25th, 2009, 02:39 PM   #1
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Question Switch current handling question

So I am trying to replace a rocker switch on a small heating unit. Original switch is rated at 16 Amp 120 Volt.

Locally I can find a switch rated at 20 Amp 12 Volt. It will fit the hole but obviously I will have to cap the lead to the light on the switch.

Will this switch handle 13 Amps at 120 Volts? !3 Amps is the actual load.
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Old Nov 25th, 2009, 03:27 PM   #2
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First switch*handles:

16 amps x 120 Volts = 1920 watts

Second switch handles:

20 Amps X 12 volts = 240 watts

Even at measure the first switch actually handles:

13 amps x 120 volts = 1560 watts

In perspective, your 15 amp circuit in your house is really designed for 1500 watts and is allowed 12 plugs or lights. there is a safety factor. The switch you want to use handles 2 1/2 lights.

There are probably other things there such as designed for AC versus DC, heat load etc.

Off hand it does not sound like a happy replacement.
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Old Nov 25th, 2009, 04:03 PM   #3
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No, it's not rated for 120v. Find one rated 120v or 240v.
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Old Nov 25th, 2009, 06:46 PM   #4
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Originally Posted by yoyo View Post
No, it's not rated for 120v. Find one rated 120v or 240v.
Ah so easy to say when one lives in a major population centre. I shall see what I can find on my next trip to the big city.
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