What this MCCB delivers
The Siemens SENTRON 3VA1140-5EF36-0JH0 is a 3-pole molded case circuit breaker rated for 40 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It is configured for line protection — no ground-fault monitoring, no undervoltage release, no communication module. The interrupting ratings are the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V. That 187 kA at 240 V means it can safely clear a fault at that level without upstream cascading — critical for high-fault-capacity mains or transformer-fed panels.
Thermal derating and endurance
The breaker holds its full 40 A rating up to 50 °C ambient. Above that, it derates gradually: 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. Mechanical endurance is 15,000 operations — that's the latching endurance figure, not the electrical endurance under load. The storage temperature range is -40 °C to 80 °C; operating range is -25 °C to 70 °C. The front face carries IP40 protection — fine for a dry indoor panel, not for washdown zones.
Auxiliary and trip options
This MCCB ships with 2 auxiliary switches plus 1 trip alarm switch (HQ type), and a shunt trip release (STL) for remote tripping. The integrated auxiliary trip order code is 3VA9688-0BL32. There is no undervoltage release, no phase-failure detection, and no communication function — it is a straightforward, non-communicating line protection device. The voltage trigger is present, meaning the shunt trip can be energized from a control voltage to open the breaker remotely.