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Because it needs to be able to cut the power to the load. That's why circuit breakers are always the first piece of equipment in a circuit after the power supply.

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14y ago

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A fuse or circuit breaker used in a circuit is usually inserted in?

A fuse or circuit breaker used in a circuit is usually inserted in series with the load.


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The most common form of a series circuit in a house is a circuit breaker (optionally in series with an on-off switch) in series with a load, usually a light bulb.


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If it is a line thermostat and it is connected across the line instead of in series with the load then yes it will trip the breaker.


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An oil circuit breaker is a breaker that is immersed in a tank of insulating oil. The tank has two electrical bushings through the tank to allow the supply and load to be connected to the breaker. These breakers can be opened under a heavy amperage load. The insulating oil is used to extinguish the arc that is produced when opening a switch under load.


Which circuit the ammeter connected in parallel?

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How is ammeter and voltmeter attached to a circuit?

Ammeters are connected in series with the load under test. This requires the load be disconnected from the source, and the ammeter placed in circuit. Voltmeters are connected in parallel with the load under test. This does not require any circuit changes. Sorry, but WikiAnswers does not support illustrations.


What size circuit breaker should be used on 125 feet of 4 AWG power feed?

The circuit breaker is used to protect the conductor that is connected to it from an overload condition. On a motor load the breaker has to be sized 250% of the motors full load amperage. Some circuits can be only loaded to 80% capacity and this is governed by the sizing of the breaker. Without knowing what the load amperage is, this question can not be answered.


Can multiple circuits be connected on one breaker?

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Does mcb trip if a short circuit occurs?

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A normal transformer should not blow the primary side breaker when it is not connected to a load on the secondary. If it does, something is wrong. Check for shorted or burned windings. Make sure that it is indeed disconnected from the load - it might still be connected to something that is also presenting a fault.


Can the power to your whirlpool be on the same 20 amp circuit as the bathroom lights and outlets?

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