Define a Circuit Breaker and Its Types.

 A circuit breaker is a consequently worked electrical change intended to shield an electrical circuit from harm brought about by overabundance current from an over-burden or short out. Its fundamental capacity is to interfere with current stream after a shortcoming is identified. In contrast to a wire, which works once and afterward should be supplanted, a circuit breaker can be reset (either physically or naturally) to continue ordinary activity. 

Circuit breakers are made in fluctuating sizes, from little gadgets that ensure low-current circuits or individual home device, up to huge switchgear intended to secure high voltage circuits taking care of a whole city. The nonexclusive capacity of a circuit breaker, or wire, as a programmed methods for eliminating power from a broken framework is frequently truncated as OCPD (Over Current Protection Device).

Circuit breaker is "An Automatic device for stopping the flow of current in an electric circuit as a safety measure."

MCB (Miniature circuit breaker)

1. The characteristics of miniature circuit breaker are below,
2. MCB rated current is not more than 100 A. means the current limit (or current rating) is maximum 100A).
3. Trip characteristics are normally meant not adjustable.
4. MCB operation is thermal based or thermal-magnetic.

MCCB (Moulded case circuit breaker)

1. The characteristics of Moulded case circuit breaker are below,
2. The current rating of MCCB is from 101 A to 1000 A.
3.  The Current of a trip (switch off the circuit) may be adjustable, means current rating we can adjust in MCCB.
4. MCCB operates in thermal or thermal-magnetic operation.

ACB (AIR Circuit Breaker)

1. The characteristics of ACB (Air Circuit Breaker) are below.
2. The current rating of ACB (Air circuit breaker) is from 1001 A to 10000 A.
3. Trip characteristics of Air Circuit Breaker (ACB) often fully adjustable including configurable trip thresholds and delays.
4. ACB (Air Circuit Breaker) often used in Main Electrical Panels (usually in medium voltage MV or high voltage electrical panels HV). ACB (Air circuit breaker) also usually used for main power distribution in a large industrial plant, where the breakers are arranged in drawn-out enclosures for ease of maintenance.

VCB (Vacuum Circuit Breaker)

Some important characteristics of Vacuum circuit breaker are below,

1. The VCB (Vacuum circuit breaker) current rating is up to 3000 Amperes.
2. The main characteristics of vacuum circuit breaker are, it interrupts the arc in a vacuum bottle.
3. These can be applied at up to 35 thousand volts.