This is a circuit breaker designed to automatically disconnect power in the event of an overload or short circuit. It features a magnetic and hydraulic delay mechanism that prevents the breaker from switching back on immediately after a fault has been cleared. The breaker has a rating of 40 amps at 277 volts AC, as well as 80 volts DC, making it suitable for use in a variety of applications. It is mounted on a lever panel and can be easily installed using a snap-in mechanism.