The Siemens 3VA2140-7MN36-0BH0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) built for motor protection. Rated 40 A continuously across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling — it handles motor starts without nuisance tripping while providing phase-failure detection and an undervoltage release (UVR) integrated at the factory. Interrupting capacity is 330 kA at 240 V AC, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That SCCR headroom lets it sit upstream in a high-fault panel without cascading to a larger frame — a real advantage when coordinating with downstream motor starters or smaller branch breakers.
Mounting and integration
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint that fits SENTRON panelboards and DIN-rail adapters. The basic switch (3VA21407MN360AA0) is pre-assembled with two auxiliary switches plus a trip alarm switch (HQ), so you get status feedback without adding external contact blocks.