It uses a thermal-magnetic trip unit — the thermal element handles overloads, and the magnetic element (fixed at 51 A) clears short-circuits.
The thermal protection adjustment range is 1.6...2.5 A, so you set the dial to match the motor's full-load current. At the 2.5 A setting, this breaker covers motors rated 0.37 kW at 230 V or 0.75 kW at 400 V. The AC-3 utilisation category confirms it's rated for switching squirrel-cage motors — starting and stopping under load — with 100,000 electrical cycles at rated current. The 690 V rated insulation voltage and 6 kV impulse withstand voltage mean it's suitable for 400 V line-to-line systems with adequate margin.
Snaps onto 35 mm symmetrical DIN rail, or screws to a panel with an adaptor plate. The 45 mm width takes one standard modular slot. Spring-cage terminals on the power circuit accept 1...6 mm² solid or 1...4 mm² flexible with ferrule — no screw torque to verify, which speeds panel wiring. Mount horizontally or vertically; the IP20 finger-safe enclosure suits enclosed panels, not washdown zones.
Certified to EN/IEC 60947-2 (circuit-breaker standard) and EN/IEC 60947-4-1 (contactor-starter standard), so it qualifies as both a branch-circuit protective device and a motor-protective device. It's also suitability for isolation per IEC 60947-1 — meaning you can safely use the toggle as a visible disconnect. Climatic withstand per IACS covers marine and humid environments.