It combines a circuit breaker and overload relay in one unit, saving panel space and wiring time. The 40 A continuous rating and CLASS 10 trip characteristic mean it handles inrush on standard induction motors up to about 18.5 kW at 400 V and trips fast enough to protect the motor during a stall or jam — not so fast that nuisance trips plague you on startup.
Breaking capacity and fault handling
This breaker is rated to interrupt 100 kA at 240 V, 50 kA at 400 V, 12 kA at 500 V, and 6 kA at 690 V. Those numbers tell you it can handle a dead short on a high-capacity transformer without welding its contacts shut — a key selectivity consideration for the site electrical engineer. The 690 V rated value means it's fine on 480/600 V systems common in North America, not just 400 V European grids.
Width is 70 mm, depth 174 mm, height 165 mm — that's a standard three-pole MCCB footprint, so it'll fit existing panel cutouts. Terminal wiring accepts solid 2x (2.5 to 16 mm²) or stranded 2x (10 to 50 mm²) and 1x (10 to 70 mm²), with AWG equivalents listed for the main contacts. The screw-type box terminals are familiar to any panel wireman; no special crimp tools needed. Mounting position is any, which helps when you're shoehorning this into a tight gland plate layout.
Environmental toughness
That's enough for unheated warehouses or hot Texas pump houses. Shock rated at 25g for 11 ms — it'll stay latched through a forklift bump or a compressor start jolt.
Power dissipation and auxiliary options
Dissipates 23 W in hot operating state (7.7 W per pole). The product extension for auxiliary switches is supported, so you can add a remote status contact for the PLC or a shunt trip for emergency-stop circuits.