Comments on: We offer 3amps@ 24VDC limit switches but requirement is 0.5amps @ 24VDC?

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By: lare

lare — Wed, 16 Jun 2010 17:15:59 +0000

i think his "limit switch" is what we call a circuit breaker. in that case 2 amps may not be adequate protection for a device that calls for 0.5 amp.
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By: kerry k

kerry k — Wed, 16 Jun 2010 16:34:59 +0000

No switch ever limits current to a certain level of volts or amperage. I hope the guy who mentioned that was being facetious. Using a switch rated for half an amp in a 2 or 3 amp load would be a real problem. I mention this as a reverse to what has been said already to emphasize the point, a switch rated for a higher current can take a current that is less than what it is rated for. I do not wish to be contrary, but your question is like thinking that a 1 ton capacity truck could not carry a 100 pound load. The 2 or 3 amp switch will work just fine with a half amp load. You can always go less than a rating, but not over it. A 500 volt rated ceramic capacitor will work just fine in a 10 volt circuit, but don't try to use it in a 1500 volt circuit.
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By: Craigory

Craigory — Wed, 16 Jun 2010 15:54:59 +0000

Either limit switch will work in your application. If you have a choice, use the one rated closest to your application.

As a point of note, when there is a large discrepancy between the rating and the application, there is a possibility of switch malfunction. If you use a 3A limit switch in a circuit that has just a few milliamps, you may not get enough wiping action on the contacts to ensure a good connection in low current applications.

Not the case here, though.
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By: Sandip P

Sandip P — Wed, 16 Jun 2010 15:40:59 +0000

Can’t use it !
The 0.5 amp limit switch is to keep the current limited to 0.5 amp. The 3 amp switch will not trip till the current reaches 3 amp, ultimately damaging the equipment
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By: aclsal

aclsal — Wed, 16 Jun 2010 15:12:59 +0000

The 3 amp limit switch will work fine. As long as the switch works the same as the 0.5 amp, then everything is great.
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