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The maximum load on a 30 amp breaker is 30 amps at 40 degrees C. If the ambient temperature is higher that 40 degrees C then the breaker will trip at a lower current. Keep in mind the breaker is a dual function device. On a short circuit the magnetic component will trip the breaker instantaneously.

If you are designing a branch circuit for a load that is constantly on, code may require you to "derate" the branch by 20 percent so that the ordinary load is not at the rated load of the overcurrent protection.

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Q: What is the max load on a 30 amp breaker?
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What is a 30 amp circuit breaker used for?

A 30 amp circuit breaker is needed unless the load is a motor circuit, then it has to be sized to 250 percent of the motors full load amps. For 30A circuit is needed breaker 30*1.25=37.5 --> 40A. If load is lamp or heater, then use breaker of group A or B. If load is motor, then use breaker of groupC or D (very hard start) or special safe breaker for motor - with variable amp setpoint. See related link also. By code you are only allowed 80% of the rating of a breaker. So 30x80%=24amps. 24 amps is the MAX allowed on a 30 amp breaker. You would need a 40amp breaker for a 30 amp circuit. 40x80%=32. So you would want a double pole 40amp breaker.


What happens when you plug a 30 amp appliance into a 50 amp breaker?

The appliance works perfectly. If you did it the other way around (50amps on a 30amp breaker, you would be tripping the breaker. Think of it as a mercury thermometer. The circuit breaker is the maximum temperature and the load on that breaker is the mercury. If the load is lower than the max, everything works beautifully. If the load becomes greater than the maximum rating, then things starting popping.


What is breaker size for 240 volt 9 KW?

The formula you are looking for is I = W/E.


How do you turn a 30 amp circuit into a 15 amp cicuit?

Replace the 30 Amp Breaker with a 15 Amp breaker.


Is the 30 amp breaker for a motorhome the same as for a house?

Yes, a 30 amp breaker is a 30 amp breaker. It must however be able to fit the box it is installed in.


Can you use a double 30amp breaker to feed 2 15 amp?

no, load will brake at 30 not 15 as needed


How do I know if I have a 30 amp breaker at my house to plug a trailer into?

If it is a 30 amp breaker then it is a 240 volt outlet.


What size breaker can you use on a 7500watt generator?

Depends on the wire size you are using. If the generator breaker is a 30 amp then install a 30 amp breaker.


How big of a load does a 30 amp plug handle on a 40 amp circuit?

If the overcurrent protection device is 40 Amps, then a 30-Amp plug can overheat and catch fire at 40 Amps before the circuit-breaker blows.


Is a double throw 15amp breaker the same as a 30 amp breaker amp?

You have a double pole breaker for 240Volt supply. The maximum current is 15 amp.


Is a 2 pole 30 amp circuit breaker equivalent to 30 amp?

Yes.


How many electrical outlet can be install to a 30amps breaker?

A 30 amp breaker is usually used for a dedicated 30 amp device. Ordinary 15 amp receptacles can not be connected to a breaker of higher trip capacity than the rating of the receptacle. The wire size for a 30 amp breaker is #10 AWG.