Line protection MCCB with high interrupting capacity
The Siemens SENTRON 3VA1040-4ED32-0KH0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current of 40 A up to 50 °C and derating to 36 A at 70 °C. Its interrupting capacity reaches 121 kA at 240 V and 75.6 kA at 415 V — figures that place it in the high-fault tier for industrial distribution panels where available fault current is substantial. The TM210 thermal-magnetic release handles overload and short-circuit protection without electronic adjustment, keeping the trip curve predictable for coordination studies. The breaker ships with a shunt trip (STL) auxiliary release and a 2+1 auxiliary contact configuration — two auxiliary switches plus one trip alarm switch HQ. That alarm contact closes only on a fault trip, giving the PLC or annunciator a dedicated signal that distinguishes overload from manual switching. No undervoltage release, no ground-fault monitoring, no communication module; this is a straightforward thermal-magnetic MCCB for conventional line protection where selectivity and simplicity are the priority.
Panel fit and mounting constraints
At 70 mm deep, 76.2 mm wide, and 130 mm tall, the 3VA1040-4ED32-0KH0 fits the standard SENTRON 3VA footprint. The IP40 front protection means it is suited for enclosed panel mounting where the door provides the environmental seal; no washdown rating here. Rated insulation voltage is 800 V, so it can be applied in 690 V systems with margin. The operating temperature range of -25 °C to 70 °C covers most indoor industrial environments, though the storage range of -40 °C to 80 °C matters if the spare sits in an unheated warehouse.