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What is the formula to calculate the fuse or circuit breaker to protect motors?
Wiki User
∙ 13y ago
Motors are rated either in Watts or Amps, and by Voltage. If the motor is rated in Amps, that is the fuse or circuit breaker size you will need. If rated in Watts, you will have to use the formula P=IE, where P is power in Watts, I is current in Amps, and E is Electromotive Force in Volts. Since we know the watts and volts, we solve for current, thus: I=P/E, and I will be your current rating.
One note: These calculations give the MINIMUM rating needed for the motor to run. Fuses and circuit breakers are usually designed so that they will break if the circuit pulls 250% of the Motor's rating.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoCB`s are rated at 250% FLA of the Motor.
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What type of circuit breaker is required for a 240 v branch circuit?
the circuit breaker used will be miniature circuit breaker(MCB) maily used in homes.Answer for USA, Canada and countries running a 60 Hertz supply service.A two pole circuit breaker is used for a load of 240 volts. It is sized, according to the load amps of the device, to protect the wires that supply the load current.
Where circuit breaker are used?
Circuit breakers do not use anything, they are a controlling device. They can automatically open the circuit if the current exceeds the current rating and you can manually disconnect the power from the circuit.
What is the switch on a overload?
to protect the source from overloading a switch can be opened as a circuit breaker, fuse, overload protection schemes
What one is better fuse or circuit breaker?
IMO it would be because the circuit breaker has the possibility of going bad and not working (allowing a short to move through the device), but fuses blow (cause a break) no matter what if shorted.
What are two methods used in most circuit breakers to protect electrical circuits?
There is a heated bimetallic strip that provides a time delay small overload protection. When its contact makes, it energizes a coil to trip the breaker. Some breakers are mechanical, though. There is a coil that trips the breaker instantly on large overload.
What is the function of the fuse or circuit breaker in a circuit?
A circuit breaker/fuse is designed to protect the wiring from getting overloaded.
Can you replace a 20 amp circuit breaker with a 25 amp circuit breaker?
No. The breaker must protect the circuit components such as wiring, outlets and switches that are connected to the breaker. Therefore if you have a 30 amp circuit as dictated by its components you need to protect it with a 30 amp or less breaker.
How are circuit breaker and fuse alike?
They both (try to) protect the rest of the circuit.
A parallel circuit breaker should be connected in a parallel to the circuit it's protecting?
For a circuit breaker to protect anything, it must be wired in series with whatever it is protecting.
What devices do not protect you from electrical fires?
circuit breaker
What is the purpus of a circute breaker?
The purpose of a circuit breaker is to protect electrical circuits from short circuiting.
What materials can be used to protect a circuit?
Fuse, screw in or plug, circuit breaker, fuseable link
Does an electric circuit have a beaker?
Electric circuit need a main circuit breaker that can protect the whole circuit from short circuit even in ground fault. It's safer if you use breaker with built in ground protection.
How does a circuit breaker help to protect against short circuits and circuit overloads?
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How are Branch circuit protected?
Branch circuits are protected by the circuit breaker found in the electrical panel. Each circuit should have its one breaker. The breaker should be rated to protect the insulation of the wire, so you can determine the breaker size based on the circuit conductor size Example #14-2 should be protected by a 15 amp breaker
What devices can help protect homes from overloaded circuits?
Circuit breaker or fuse.fuse
What device is used to protect buildings from electrical fires?
Circuit breaker or a fuse
