7 Terms
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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.
Overcurrent trip switch (OTS)
Electrical equipment; Circuit breakers
A mechanical switch that operates when the circuit breaker is tripped by the trip system.
