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Depends upon the voltage, since P = I x E. If we were to assume 120 volts (typical in USA and a few other countries), and design load of 80 percent, you could safely supply 0.8 x 15 x 120 or 1440 watts. Of course, the wiring would also need to support 15 Amps or more.

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11y ago
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13y ago

A 15 amp breaker will trip at 15 amps at an ambient temperature of 40 degree C. If the ambient temperature is higher the breaker will trip before 15 amps and if the ambient temperature is lower the breaker will trip after 15 amps.

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11y ago

Breakers do not limit Watts they limit Amps. When I device is connected to that circuit and draws more than 15 amps the breaker will trip to prevent overheating of the conductors and a possible fire.

However if you do some basic simple math and multiply the 15 amps by the voltage applied to the circuit you could come up with a maximum wattage that will be present.

Therefore assuming you are working with 120V: 15Amps x 120V = 1800 Watts of power.

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The electrical code states that circuit conductors can only be loaded to 80% of their capacity. So the maximum legal wattage load on a 15 amp breaker is 1800 x 80% = 1440 watts.

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14y ago

It will take 8 ohms or less at 120 volts. At 240 volts it will take 16 ohms or less.

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12y ago

The trip point on a 15 amp breaker is 15 amps. So a load that draws a current over 15 amps will trip the breaker.

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Q: How many amps does it take to trip a 15 amp breaker?
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How many amps doe it take to trip a 20 amp breaker?

20 amps on the circuit will trip it unless it is is broken. Then it may trip with a lower current or not at all... Any resistance added to the circuit from a bad or dirty connection will add to the total current causing it to trip sooner than expected.


How many volts can you draw off of a 15amp breaker?

It's the amps that are controlled by the breaker not the volts. You can have a 600 volt 15 amp breaker, you can have a 347 volt 15 amp breaker. The breaker will trip when you exceed 15 AMPS.


How can a 30 Amps fuse for a shower of 9.5KW be replace with a 40 Amps fuse on RCD trip?

If the current safety requirement is 30 amps, you can;t run if off of a larger circuit breaker. It violates NEC and is very unsafe. If the current requirement is 40 amps , it will continuously trip a 30 amp breaker because it is too small of a breaker in electrical requirement.


I have a 15 amp tool hooked up to a 15 amp breaker- This trips the breaker even with nothing else running- There is also a GFCI outlet on the same circuit- Is the breaker or GFCI bad?

A 15 amp breaker will trip at 15 amps at an ambient temperature of 104 degree F. If the ambient temperature is higher the breaker will trip before 15 amps and if the ambient temperature is lower the breaker will trip after 15 amps. I would suspect the circuit is overloaded. But, you can change the breaker and see what happens. Just swap it with another one.


What is the continuous current draw on a 20 amp circuit breaker?

Depends on what you have connected to the circuit. It is less than 10 amps or the breaker would trip. A rule of thumb is you design for about 80% load related to the breaker. For 20 amps that would equal 16 amps.

Related questions

How many amps doe it take to trip a 20 amp breaker?

20 amps on the circuit will trip it unless it is is broken. Then it may trip with a lower current or not at all... Any resistance added to the circuit from a bad or dirty connection will add to the total current causing it to trip sooner than expected.


How many amps would it take to kick a 15 amp breaker with 7 ohms resistance on a 277 volt circuit?

A 15 amp circuit breaker should trip at 15 amps regardless of the load voltages or impedances. If you have 277 volts and 7 ohms, the current would be 39.5 amps and a 15 amp circuit breaker should trip.


How many volts can you draw off of a 15amp breaker?

It's the amps that are controlled by the breaker not the volts. You can have a 600 volt 15 amp breaker, you can have a 347 volt 15 amp breaker. The breaker will trip when you exceed 15 AMPS.


What is KA in Circuit Breaker?

KA stands for kilo-amps, or thousands of amps. Thus a 2KA breaker means it will trip when the load exceeds 2,000 amps.


How can a 30 Amps fuse for a shower of 9.5KW be replace with a 40 Amps fuse on RCD trip?

If the current safety requirement is 30 amps, you can;t run if off of a larger circuit breaker. It violates NEC and is very unsafe. If the current requirement is 40 amps , it will continuously trip a 30 amp breaker because it is too small of a breaker in electrical requirement.


I have a 15 amp tool hooked up to a 15 amp breaker- This trips the breaker even with nothing else running- There is also a GFCI outlet on the same circuit- Is the breaker or GFCI bad?

A 15 amp breaker will trip at 15 amps at an ambient temperature of 104 degree F. If the ambient temperature is higher the breaker will trip before 15 amps and if the ambient temperature is lower the breaker will trip after 15 amps. I would suspect the circuit is overloaded. But, you can change the breaker and see what happens. Just swap it with another one.


What is the continuous current draw on a 20 amp circuit breaker?

Depends on what you have connected to the circuit. It is less than 10 amps or the breaker would trip. A rule of thumb is you design for about 80% load related to the breaker. For 20 amps that would equal 16 amps.


The Function Of A Twenty Amp Breaker?

It limits the current to the circuit at 20 Amps. If a load on the circuit draws more than 20 Amps the breaker will trip and interrupt the current to all devices on the circuit.


Can start amps of 27 trip a 15 amp circuit breaker?

Of course! There may be a rare case where a spike of very short duration above 15 A won't trip the breaker, but in the case of a motor startup it should trip.


How many 115 volt outlets could you run from a 20 amp breaker?

If you never plug anything into them, there is no limit. If the total current drawn from all outlets exceeds 20 amps, the breaker will trip.


How many watts can be on a 15amp breaker?

At 120 volts a 15 amp breaker can be loaded to 1800 watts before it will trip. If it is a continuous load then the electrical code states that it is only allowed to be loaded to 80%. This will be 1800 x .8 = 1440 watts. If the voltage is not 120 volts use the following equation Watts = Amps x Volts. Amps being the breaker size that is to be used.


What is the function of a 15 amp circuit breaker?

To trip when current is in excess of 15 amps and protect the circuit components.