Product identity and ratings
The C-curve trips between 5 and 10 times rated current, so this 40 A unit will hold through the starting surge of a 7.5 kW motor or a bank of LED drivers while still clearing a hard short within the 6 kA limit. For audit purposes, the breaking capacity is verified per EN 60898, and the unit carries energy limitation class 3, meaning it limits let-through energy to a low level during a fault.
Thermal derating and installation constraints
Rated current is temperature-dependent: 40 A at 35 °C, derating to 37.6 A at 40 °C, 36.36 A at 45 °C, 35.04 A at 50 °C, and 33.68 A at 55 °C.