The MO165 short-circuit circuit breaker with electromagnetic protection represents the compact and powerful series for short-circuit protection of motors up to 45 kW (400 V) with a module width of 55 mm. The device has a rotary handle operation with a clear switch position indicator I/TRIP/0. The rotary handle can be locked directly in the 0 position using a padlock. Auxiliary and signal contacts as well as undervoltage and shunt current releases can be installed without tools. 3-phase rails for 125 A allow several devices to be fed together. Accessories for control cabinet installation complete the range.