32 A at 40 °C — the real thermal limit
The Schneider NG125L is a 4-pole circuit breaker rated 32 A at 40 °C ambient. That 40 °C reference point matters: if your panel runs warmer — say 50 °C — you need to derate the continuous current, or the bimetal trips early on a load that should hold. The 690 V AC insulation voltage (Ui) and 8 kV impulse withstand (Uimp) place it squarely in industrial distribution, not residential final circuits.
DIN-rail fit and wiring
Clips onto 35 mm symmetrical DIN rail per EN 60715. Tunnel terminals accept 1.5…50 mm² rigid copper; strip 20 mm and torque to 3.5 N·m. At 108 mm wide for four poles, it fills about six modular spaces on the rail — plan your gland-plate fill accordingly. IP20 finger-safe front, so it's fine inside a closed panel but not for outdoor or washdown zones.
Electrical durability and frequency range
Rated for 10,000 electrical cycles — adequate for a distribution feeder or motor branch circuit that sees a few operations per day. Network frequency covers 50…60 Hz, so it works on both 50 Hz European and 60 Hz North American grids without derating.