20 Terms
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Circuit breakers
Industry: Electrical equipment
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Circuit breakers
Zone-selective interlocking (ZSI)
Electrical equipment; Circuit breakers
A communication capability between electronic trip systems and ground-fault relays which permits a short circuit or ground fault to be isolated and cleared by the nearest upstream device with no ...
Zero-sequence ground-fault sensing
Electrical equipment; Circuit breakers
A means of providing equipment ground-fault protection utilising an external sensor (surrounding all phase and neutral conductors).
Zero-blind time
Electrical equipment; Circuit breakers
Metering method used by the MICROLOGIC® H trip unit where a dedicated metering data chain is separate from the protection data chain so that a greater number of data samples can be used for ...
Withstand rating
Electrical equipment; Circuit breakers
The level of RMS symmetrical current that a circuit breaker can carry with the contacts in a closed position for a stated period of time–usually stated in cycles.
Trip system
Electrical equipment; Circuit breakers
A system which consists of a MICROLOGIC trip unit and current transformers.
Trip indicator reset
Electrical equipment; Circuit breakers
A button on the trip indicator module used to reset the trip indicator.
Trip indicator
Electrical equipment; Circuit breakers
A module that mounts directly to the circuit breaker trip unit that displays whether the circuit breaker tripped due to an overload, a shortcircuit or a ground-fault condition.
