43 Terms
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Circuit breakers
Industry: Electrical equipment
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Circuit breakers
Overcurrent mechanism
Electrical equipment; Circuit breakers
An internal mechanical system which trips the circuit breaker during an overcurrent.
Overcurrent
Electrical equipment; Circuit breakers
Any current in excess of the rated continuous current of equipment or the ampacity of a conductor.
Inverse time
Electrical equipment; Circuit breakers
A qualifying term indicating there is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases.
Interrupting rating
Electrical equipment; Circuit breakers
The highest current at rated voltage available at the incoming terminals of the circuit breaker. When the circuit breaker can be used at more than one voltage, the interrupting rating will be shown ...
Interchangeable trip unit
Electrical equipment; Circuit breakers
A trip unit which can be interchanged by a user among circuit breaker frames of the same design.
Integral ground-fault protection for equipment
Electrical equipment; Circuit breakers
Equipment ground-fault protection on grounded neutral systems provided by components internal to the circuit breaker.
Miniature circuit breaker (MCB)
Electrical equipment; Circuit breakers
A small circuit breaker which is assembled as an integral unit in a supportive and enclosed housing of insulating material, rated 150 A or less and used in 120 V, 120/240 V, 240 V and 480Y/277 V ac ...