Model ESM1 is a motor protection circuit breaker (MPCB) that provides a suitable solution for no-fuse installation to protect motors and wiring against overloads (overload) and short circuits. The device combines the functions of switching, signaling and protection in a single compact unit. Due to this modular design, various accessories such as undervoltage release (under-voltage release), shunt release, auxiliary contacts, connectors, insulated enclosures, three-phase connecting links, emergency stop buttons, indicating lamps and padlocking can be added, depending on the application.