18 Terms
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Circuit breakers
Industry: Electrical equipment
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Circuit breakers
Thermal imaging
Electrical equipment; Circuit breakers
A trip unit function that accurately maps the heating and cooling effects of load behaviour on rated conductors to provide thermal protection without nuisance tripping.
Stored energy mechanism (SEM)
Electrical equipment; Circuit breakers
A spring mechanism that is compressed or "charged" and then released or "discharged" to close the circuit breaker.
Spring charging motor
Electrical equipment; Circuit breakers
A motor which electrically charges the stored energy closing spring(s).
Spring-charging handle
Electrical equipment; Circuit breakers
A handle located on the front of the circuit breaker used to manually charge the stored energy mechanism.
Shunt trip (MX)
Electrical equipment; Circuit breakers
An accessory which trips the circuit breaker from a remote location using an external voltage source.
Shunt close (closing coil) (XF)
Electrical equipment; Circuit breakers
An accessory which closes the circuit breaker from a remote location using an external voltage source.
Short-time pickup
Electrical equipment; Circuit breakers
The current level at which the circuit breaker shorttime delay function begins timing.
