The Schneider Electric G12F4F40 is a GoPact MCCB 125 molded-case circuit breaker rated at 40 A at 40 °C, with a 30 kA breaking capacity at 380/415 V AC — that F-class performance (per IEC 60947-2) means it handles moderate fault levels typical of distribution sub-panels without needing an upstream current-limiting fuse. The 4-pole construction (4D protected poles) with neutral on the left suits three-phase distribution where you want a switched neutral. The TM-D trip unit gives thermal-magnetic LI protection: thermal for overload, magnetic for short circuit, no electronic adjustment — set-and-forget for fixed-load panels.
The 8000-cycle electrical endurance at rated current means it's designed for infrequent switching — it's a distribution breaker, not a motor-starting contactor. The IP20 finger-safe terminals are fine inside a locked panel; no washdown rating here.
Fixed-mount only — no plug-in base. Backplate mounting, 100 mm wide × 130 mm high × 60 mm deep, with a 25 mm connection pitch between poles. Screw terminals front-connected top and bottom; no rear-connect option. The toggle control is manual, not motor-operated. The grey RAL 7035 housing is the standard Schneider panel colour.