It is a 3-pole, 50 A unit (rated at 65 °C) designed specifically for motor protection duty, with an interrupting capacity of 100 kA Icu at 690 V AC per IEC 60947-2. It supports motor tripping classes 5, 10, 20, and 30, which means it can be set to match the thermal withstand curve of most standard induction motors — a critical detail for motor branch-circuit coordination. The electronic trip unit also includes an energy meter, LCD display, and communication capabilities that report thermal image, demand current/power, power quality, phase sequence, and time-stamped event histories. The 20-minute thermal memory before and after tripping preserves the thermal state of the motor during a re-start attempt — no spare, no sleep if that memory is missing on a competitor unit.
At 100 kA Icu at 690 V AC, this MCCB sits at the high end of the ComPacT NSX breaking capacity range. The HB2 code means it can handle worst-case fault currents on a 690 V industrial supply without cascading upstream — a key spec for panel builders who need full selectivity with a transformer or generator main breaker. The 100 kA rating holds at 500 V, 525 V, and 660/690 V AC 50/60 Hz, so it does not derate across the common industrial voltage bands. Utilisation category A (no deliberate short-time delay for selectivity) is standard for this class; coordination with downstream devices relies on the adjustable So (short-time) protection curve.
Five accessory slots allow for auxiliary contacts, shunt trips, under-voltage releases, or communication modules. IK07 impact protection covers accidental tool drops during maintenance.
Durability and environmental ratings
Electrical durability varies with load: 20,000 cycles at 440 V at half rated current (In/2), 10,000 cycles at 440 V at full In, and 5,000 cycles at 690 V at full In. For a motor-starting application (AC-3 duty), the electrical endurance will be lower than the resistive-load figures — plan spares accordingly for high-cycle installations. Operating altitude is 0–2,000 m without derating, with derating required above 2,000 m up to 5,000 m. Relative humidity range is 0–95%. The LCD display and flashing LED indicators (green for ready, red for temperature over set point) provide local status without opening the panel door.