It carries a continuous current of 40 A at 40 °C, with a symmetrical breaking capacity of 75.6 kA at 415 V AC — the figure that governs its fault-interruption capability in a 400 V distribution panel.
At 240 V the interrupting rating rises to 121 kA; at 500 V and 690 V it drops to 11.9 kA. For a 400 V panel fed by a transformer in the 1–2 MVA range, the 75.6 kA figure typically provides enough headroom for a main breaker application without cascading.
Thermal derating and ambient conditions
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A.
Built-in auxiliary and release options
No communication function or ground-fault monitoring is included on this order code.
The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for Siemens SENTRON 3VA1 frames. It mounts via screw terminals to a backplate or DIN rail; the 70 mm depth leaves clearance for rear-connected busbars in a typical distribution board.