Circuit breakers

Circuit breakers

Industry: Electrical equipment

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Circuit breakers

Long-time delay

Electrical equipment; Circuit breakers

The length of time the circuit breaker will carry a sustained overcurrent (greater than the long-time pickup) before initiating a trip signal.

Long-time ampere rating

Electrical equipment; Circuit breakers

An adjustment which, in combination with the installed rating plug, establishes the continuous current rating of a fullfunction electronic trip circuit breaker.

Local current metre

Electrical equipment; Circuit breakers

An ammeter installed as part of the trip unit.

Neutral current transformer

Electrical equipment; Circuit breakers

A current transformer which encircles the neutral conductor; required on circuit breakers with ground-fault protection, when applied on a grounded system.

Motor circuit protector

Electrical equipment; Circuit breakers

A recognised component of construction similar to a circuit breaker except with no thermal elements so that it provides shortcircuit protection only.

Moulded case circuit breaker (MCCB)

Electrical equipment; Circuit breakers

A circuit breaker which is assembled as an integral unit in a supportive and enclosed housing of insulating material, generally 20 to 3000 A in size and used in systems up to 600 Vac and 500 Vdc.