1- What is the Circuit Breaker?:

Circuit breaker is an electromechanical safety device which is used for switching of electrical circuit with protection as overload and short circuit. It protects the system as mechanical function. When any fault or interruption in an electrical circuit then it will trip and equipment will safe.
Different types circuit breakers are used according equipment capacity, fault severity, low voltage or high voltage etc.

2- Working Principle of Circuit breaker:

The mainly work of circuit breaker is to close or open to the any electrical circuit. It has two contact moving and fix.
If the circuit breaker is low capacity-2A to 63A then it is operated as manual. If the circuit breaker is high capacity then it is used as both types auto and manual.

Manual mode:

In manual function a spring mechanism is operated for circuit closing and tripping function. Moving contact is contacted to the fixed contact by pressure of spring mechanism with strip. Due to short circuit or heavy load the tripping mechanism is activated.

Auto mode:

In auto function the spring mechanism is operated with a electromechanical closing coil and tripping mechanism is operated with shunt coil. A operating supply is provided from auto management system and tripping supply is provided from short circuit or over load relay.

3- Types of circuit breakers:

1- Low Voltage Circuit Breaker:

MCB- Miniature case circuit breaker.

MCB is a electromechanical device which is used for protection of circuit from short circuit and overload.
What is the MCCB , working principle and connection diagram?

ELCB- Earth leakage circuit breaker.

ELCB is a earth leakage electromechanical device which is used for protection of circuit from earth leakage. What is the MCCB , working principle and connection diagram?

RCCB- Residual case circuit breaker.

RCCB is a earth leakage electromechanical device which is used for protection of circuit from earth leakage. What is the RCCB , working principle and connection diagram?

MPCB- Motor protection circuit breaker.

MPCB is a electromechanical safety device which is specially designed and used for motor protection.
What is the MPCB , working principle and connection diagram?

MCB- Changeover switch.

MCB changeover is a latest electrical device which is used for operating two source, one is EB source and other is DG backup source. It is operated as manually. One time one source can be connected. What is the MCB changeover, working principle and connection diagram?

MCCB-Molded case circuit breaker.

MCCB is a electromechanical safety device which is used for close or open any circuit with short circuit, overload and earth fault protection. It is used for 100A to 800A capacity.
What is the MCCB , working principle and connection diagram?

ACB-Air circuit breaker.

ACB is a electromechanical safety device which is used for close or open any circuit with short circuit, overload and earth fault protection. It is used for 800A to 4000A capacity. A arc chute is used for extinguish the arc during closing or open contact. What is the ACB , working principle and connection diagram?

2- High Voltage Circuit Breaker:

OCB- oil circuit breaker.

OCB is a electromechanical safety device which is used for close or open circuit with short circuit, overload and earth fault protection. It is used for 11 KV to 33 KV. The insulation oil is used for arc extinguish during contact closing and opening.

VCB- Vacuum circuit breaker.

VCB is a electromechanical safety device which is used for close or open circuit with short circuit, overload and earth fault protection. It is used for 11 KV to 33 KV. The Vacuum chamber is used for arc extinguish during contact closing and opening. What is the VCB , working principle and connection diagram?

SF6-sulphur hexa fluoride

SF6 is a electromechanical safety device which is used for close or open circuit with short circuit, overload and earth fault protection. It is used for 11 KV to 33 KV. The SF6 gas chamber is used for arc extinguish during contact closing and opening. What is the GCB-SF6 , working principle and connection diagram?

3- DC Voltage Circuit Breaker.

DC Circuit breaker is a electromechanical safety device which is used for close or open circuit with short circuit, overload and earth fault protection. It is used for 12 Volt DC. it is used for battery bank and DC motors.

4- which is the best circuit breaker?

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