The PLN4 miniature circuit breaker (MCB) is a protective device that’s equipped with both a thermal and an electromagnetic release. The former responds in the event of an overload, while the latter offers protection against short circuits. The 1+N-pole MCB is only 1 HP wide and is available with rated currents from 2 A to 40 A. The switching capacity is 4.5 kA. The circuit breaker, which is available with tripping characteristics B and C, is equipped with a red-green contact-position indicator for indicating the device state.