Motor circuit breaker - connections

Thread starter Ivan001
Start date Feb 10, 2020
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Circuit Circuit breaker Motor

In summary, a motor circuit breaker is an electrical device that protects electric motors from overloads and other types of faults. It uses an electromechanical mechanism to detect abnormal current levels and interrupt the flow of electricity. There are different types of connections available for motor circuit breakers, including direct, thermal-magnetic, and electronic connections, and the most appropriate type depends on the specific requirements of the motor and electrical system. It is recommended to have a licensed electrician install a motor circuit breaker, but it is possible to install it yourself if you have the necessary knowledge and experience.

Feb 10, 2020

Ivan001

Why we use such connection between 4 and 5 terminals? Why the transformer isn't connected via 2 and 4 terminals from CB, the voltage will still be 380V because it's between two phases? In such situation the terminals 5 and 6 will stay unused, why not on this way?

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Feb 10, 2020

Dullard

Most 3-phase overload relays requires current on all 3 legs. This wiring method provides that.

FAQ: Motor circuit breaker - connections

What is a motor circuit breaker?

A motor circuit breaker is an electrical device that is used to protect an electric motor from damage caused by overloading, short circuits, and other electrical faults. It is designed to interrupt the flow of electricity to the motor when it detects an abnormal current or voltage.

How does a motor circuit breaker work?

A motor circuit breaker works by using an electromagnet to detect abnormal current or voltage in the motor circuit. When this occurs, the electromagnet pulls down a metal lever, which causes the circuit to break and stop the flow of electricity to the motor.

What are the different types of connections for a motor circuit breaker?

There are three main types of connections for a motor circuit breaker: line, load, and control. The line connection is where the power supply is connected to the circuit breaker, the load connection is where the motor is connected, and the control connection is where the control circuit is connected.

What is the purpose of a shunt trip in a motor circuit breaker?

A shunt trip is an additional feature in a motor circuit breaker that allows for remote tripping of the circuit breaker. It is typically used in situations where the circuit breaker needs to be tripped quickly, such as in an emergency or for maintenance purposes.

How do I properly connect a motor circuit breaker?

To properly connect a motor circuit breaker, you should first make sure that the power supply is disconnected and the circuit breaker is in the off position. Then, connect the line, load, and control wires to their respective connections on the circuit breaker. Finally, turn the power supply back on and test the circuit breaker to ensure it is functioning properly.