Siemens 3VA1140-6EF42-0AA0 — 40 A, 4-Pole SENTRON MCCB for Line Protection
The Siemens 3VA1140-6EF42-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 40 A rating at 40 °C across four poles, with a TM240 thermal-magnetic overcurrent release — the thermal element handles overloads, the magnetic element clears short-circuits. The 220 kA breaking capacity at 240 V gives it headroom for high-fault installations; at 415 V it still interrupts 154 kA, and at 690 V it holds 17 kA. That kind of SCCR means it can sit upstream of smaller breakers without coordination worries in most industrial panels.
Ratings and What They Mean for Your Panel
The 40 A rating holds steady from 40 °C up to 50 °C, then derates slightly — 39 A at 55 °C and 60 °C, 38 A at 65 °C, 37 A at 70 °C. If your panel runs hot, that derating curve tells you the breaker won't nuisance-trip as long as the load stays under the adjusted figure. The rated insulation voltage is 800 V, so the internal clearances are sized for 690 V systems without derating. Front-side IP40 protection means it's splash-proof from the front but not sealed against dust ingress into the enclosure — standard for panel-mount gear.