It is designed for motor and transformer protection in AC networks, with a breaking capacity of 100 kA Icu at 400/415 V AC 50/60 Hz per IEC 60947-2. The 138 A magnetic trip setting handles inrush without nuisance trips, while the thermal element protects against sustained overloads. Suitability for isolation per IEC 60947-1 means it can serve as a disconnecting means in the motor branch circuit.
The 6.3 A rated current (In) sets the continuous ampacity through the breaker. For motor protection, the unit covers 1.1 kW at 220/230 V and 2.2 kW at 400/415 V AC 50/60 Hz — match this to your motor nameplate FLA. The utilisation category AC-3 per IEC 60947-4-1 confirms it is rated for switching squirrel-cage motors during starting and running. Electrical durability is 100,000 cycles at AC-3, 415 V In — enough for frequent start-stop applications like conveyors or pumps.
The 45 mm width (3-module) fits standard enclosure cutouts. IP20 finger-safe terminals accept up to 2 x 6 mm² solid or 2 x 4 mm² flexible with ferrule. Tightening torque is 1.7 N·m on the screw clamp terminals.