The Siemens SENTRON 3VA2140-5MN32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated at 40 A, designed specifically for motor protection. It carries a flat 40 A rating across the full ambient temperature range from 40 °C to 70 °C — no derating needed as the panel warms up, which simplifies panel design in enclosed or high-heat environments.
Breaking capacity and selectivity
Breaking capacity sits at 187 kA at 240 V and 121 kA at 415 V — figures that put this MCCB in the high-interrupting category for industrial distribution. At 500 V it still clears 75.6 kA; at 690 V the rating drops to 3.7 kA, which is typical for this frame size and reflects the arc extinction limits at higher voltage. For a 40 A motor-protective breaker, the 121 kA at 415 V gives ample headroom for high-fault installations like transformer secondaries or large motor control centers.
Protection and auxiliary complement
Built-in phase failure detection is standard, and the breaker ships with an undervoltage release (UVR) and a full auxiliary switch set: two auxiliary switches plus one trip alarm switch. That means it arrives ready for remote status monitoring and undervoltage trip without ordering separate accessories. The UVR drops the breaker when control voltage falls below the dropout threshold — common in safety circuits and emergency-stop chains.
Physical fit and integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA frame footprint that drops into existing panel layouts without re-drilling. The 86 mm depth is shallow enough for 200 mm deep enclosures with wiring clearance behind the breaker.