This is a circuit breaker designed to interrupt electrical circuits in case of an overload or short circuit. It has a magnetic hydraulic delay mechanism, which allows for a time lag before the circuit is actually broken, providing some protection against voltage spikes and other transient conditions. The circuit breaker can handle 150 amperes of current at 277 volts AC and 125 volts DC. It features a lever-style handle for manual operation and is mounted on a standard chassis mounting system.