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Relay and amperage question

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Old Aug 11, 2005 | 04:58 PM
  #1  
NitrousB.I.G.'s Avatar
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From: abbotsford, bc, canada
Default Relay and amperage question

If I wire two 40A relays in parallel will it allow 80A of flow.
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Old Aug 12, 2005 | 03:14 PM
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Wes V's Avatar
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From: Winnetka, Calif, USA
Default Re: Relay and amperage question (NitrousB.I.G.)

In theory, yes.

However if they are not "matched" in their resistance (everything has a certain amount of resistance), the flow will not be balanced. One will flow 41 and the other 39. The one flowing 41 burns out, and then the other has to flow the total 80. It blows out also.

So dang it, don't do it. Just get a relay that is capable of more than the current flow you expect. Think about the "power relay" Honda's use and try to find a rating for it.

Wes
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Old Aug 12, 2005 | 03:15 PM
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Wes V's Avatar
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From: Winnetka, Calif, USA
Default Re: Relay and amperage question (Wes V)

By the way, "the12volt.com" is your friend in regards to relays (and other electrical stuff)

Wes
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Old Aug 12, 2005 | 07:08 PM
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V8MeatHead's Avatar
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From: Holley 4053, carb 406 stroker anal Luber, Fag
Default Re: Relay and amperage question (Wes V)

Also. What AWG wire do you think they calculated(well usually they just look at a chart) to be used with 40A relay? Do you think they designed the wires to hold 80A? No. So don't do it. You run the possibility of melting them, then shorting something.
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