It's a 3-pole thermal-magnetic device with a rated current of 2.5 A, sized to protect a 0.75 kW motor at 400/415 V AC 50 Hz. It's phase-failure sensitive per IEC 60947-4-1, so it will trip if one phase drops out — a common cause of motor burnouts on lightly loaded lines.
In a panel with a transformer-fed supply capable of 65 kA fault current, this breaker still has headroom. Utilisation category AC-3 (IEC 60947-4-1) means it's rated for starting and stopping squirrel-cage motors — the standard duty for motor circuit breakers. AC-3e is the energy-efficient motor variant, same switching duty but tested with motors that draw higher inrush. Electrical durability is 100,000 cycles at 415 V at rated current for both AC-3 and AC-3e — that's a solid service life for a panel-mounted breaker. Dimensions are 89 mm high, 45 mm wide, 78.5 mm deep — a standard 45 mm module width that fits alongside contactors in a motor control centre. IP20 finger-safe protection on the front; IK04 impact resistance means it can take a knock from a dropped tool during panel servicing. Operating altitude is limited to 2000 m — above that, derate for air density.
Certified to EN/IEC 60947-2 (circuit-breaker standard) and EN/IEC 60947-4-1 (contactor/motor-starter standard), plus UL 60947-4-1 and CSA C22.2 No 60947-4-1 for North American installations. Fire resistance rated at 960 °C per IEC 60695-2-11. Climatic withstand conforms to IACS for marine and offshore environments.