How Much Current Can 30/40 Amp Relay Hold?

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2000vsm

Copper - Posts: 65

Joined: June 30, 2002

Posted: July 25, 2002 at 12:04 PM / IP Logged

I'm planning on using a relay to power about 5 sirens.. is it ok to just use one relay? cuz like the headlights and foglights use only one relay and the lights are like 55 watt each, so 110 watt.. and each of my sirens are only 15watt and only 3 of them are in use most of the time so that's 45watt and total is 75 watt

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mobiletoys2002

Gold - Posts: 1,050

Joined: April 12, 2002

Location: United States

Posted: July 25, 2002 at 6:24 PM / IP Logged

well your post tells how much current 30/40 amp yes 30 amps of curent a relay can handle .thats more than enough for sirens make sure your wire is big enough to supply all the current required. use a 14 guage or so as the wire to the relay this wire will be used to supply the relay with enough curent for the sirens.

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topinstaller

Member - Posts: 25

Joined: July 29, 2002

Location: United States

Posted: July 31, 2002 at 4:09 AM / IP Logged

This is where Ohm's Law comes in handy. I = P/V or Current(Amps) = Power(Watts)/Volts . Well we know that you have approximately 75 Watts of power. We know that your battery Volts is about 12V. So therefore your maximum current draw will be approximately 6.25Amps. 75 / 12 = 6.25. Your typical relay is rated at 30Amps continuous and 40Amps peak or max. Go ahead and add about 10 more sirens you have plenty more in that relay. LOL.

I'm Don.I can answer all your security questions. I have 12 years in the industry.

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How Much Current Can 30/40 Amp Relay Hold?

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