 Electrical Question, what happens to the amp rating |
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| 76-914 |
 Feb 18 2011, 04:32 PM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,647 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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If I am using a switch that is rated for 16A @125vac in a 12vdc application does the amp rating of the switch also change?
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| Mike Bellis |
Feb 18 2011, 04:37 PM
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#2
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Resident Electrician Group: Members Posts: 8,346 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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The amp rating is based on the gauge of the conductor. If you need 16A of 12V, you should use the switch to throw a relay.
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| messix |
Feb 18 2011, 07:03 PM
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#3
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
Ohms law. Amp x volts=watts watts/volts=amp
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| zonedoubt |
Feb 18 2011, 08:43 PM
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#4
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Canadian Member Group: Members Posts: 668 Joined: 14-May 03 From: Vancouver, BC Member No.: 696 Region Association: Canada |
QUOTE(messix @ Feb 18 2011, 05:03 PM)  Ohms law. Amp x volts=watts watts/volts=amp Actually, that's Joule's Law. Ohm's law is V=IR. |
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| zonedoubt |
Feb 18 2011, 09:02 PM
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#5
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Canadian Member Group: Members Posts: 668 Joined: 14-May 03 From: Vancouver, BC Member No.: 696 Region Association: Canada |
QUOTE(76-914 @ Feb 18 2011, 02:32 PM) If I am using a switch that is rated for 16A @125vac in a 12vdc application does the amp rating of the switch also change? Use the DC rule of thumb: the highest AC amperage rating on the switch should work up to 30 VDC. In this case, the switch can probably handle 16A up to 30 VDC. But this depends on the switch...check the specifications if in doubt. |
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| 76-914 |
Feb 18 2011, 09:29 PM
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#6
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,647 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Thx, it's just a small winch motor that makes a 30 sec run once a week. I wanted to be sure the switch was large enough.
EDIT: I'm guessing it's less than 4 amp |
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