It protects motor branches against short-circuit and overload in a single device, eliminating the need for a separate fuse or breaker upstream for most installations.
Ratings that drive the fit
Rated 18 A continuous (In), the GV3P186 handles motor loads up to 7.5 kW at 400/415 V AC and 9 kW at 500 V AC. The magnetic trip is fixed at 252 A — 14 times In — so it rides through motor inrush without nuisance tripping, yet clears a bolted fault fast. AC-3 utilisation category (IEC 60947-4-1) confirms it is rated for switching squirrel-cage motors under load: starting, stopping, and reversing. Electrical durability is 50,000 cycles at AC-3, 415 V, which aligns with a typical 10–15 year service life in a moderately cycled conveyor or pump application. Breaking capacity steps down with voltage: 100 kA at 230/240 V and 400/415 V, then 50 kA at 440 V, 12 kA at 500 V, 6 kA at 690 V.
The 55 mm width and 136 mm depth fit standard distribution enclosures. Connection pitch is 17.5 mm without spreaders — plan for lug-ring terminals torqued to 6 N·m. IP20 finger-safe protection means it is suitable for enclosed panels where personnel do not contact live parts. The dark-grey rotary handle provides local on/off control and a clear visual indication of contact position.