20 Terms
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Circuit breakers
Industry: Electrical equipment
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Circuit breakers
Amperes interrupting rating (AIR)
Electrical equipment; Circuit breakers
The highest current at rated voltage that an overcurrent protective device is intended to interrupt under specified test conditions (NEC).
Adjustable rating plug
Electrical equipment; Circuit breakers
A component which plugs into the trip unit, establishing the ampere rating of the circuit breaker
Accessory cover
Electrical equipment; Circuit breakers
A removable cover on the front of a circuit breaker behind which are mounted the trip unit and all electrical accessories.
Accessory
Electrical equipment; Circuit breakers
An electrical or mechanical device that performs a secondary or minor function apart from overcurrent protection.
Unit-mount circuit breaker
Electrical equipment; Circuit breakers
A circuit breaker mounted such that it cannot be removed without removing primary and sometimes secondary connexions or mounting supports.
Undervoltage trip release (MN, UVR)
Electrical equipment; Circuit breakers
An accessory which trips the circuit breaker automatically when the monitored circuit voltage falls below a predetermined percentage of its specified value.
Trip unit
Electrical equipment; Circuit breakers
A programmable device which measures and times current flowing through the circuit breaker and initiates a trip signal when appropriate.
