The protective devices that are used for the oversight and operational decision making in low voltage circuit breakers (LVCBs) are are often simply referred to as a Solid-State Trip device (SST). They are essentially protective relays that are frequently an integrated part of a low voltage circuit breaker and monitor the primary current path of the circuit breaker. In normal operation, these solid-state trip devices will sense changes in the primary current path and make the decision to open the circuit based on the magnitude and duration of the fluctuation.
The Megger SG32-1500M is housed in a rugged yet portable enclosure, which makes it suitable for use in and outdoor conditions.
Relays play a critical role in the protection of electrical power systems. They are used to monitor and control the operation of power system components. For example, if a protective relay were to senses a fault condition, it could tell a circuit breaker or some other protective device to open and thereby isolate the faulted portion of the circuit.