40 A continuous, no derating through 70 °C
The Siemens SENTRON 3VA2140-5MN32-0AF0 is a 3-pole molded case circuit breaker rated for 40 A continuous current across the full operating temperature range from -25 °C to 70 °C — no derating curve to manage, which simplifies panel thermal budgeting. That 40 A holds flat at every 5 °C increment from 40 °C through 70 °C, so the breaker's ampacity is what it says on the nameplate regardless of enclosure heat rise. Interrupting capacity reaches 187 kA at 240 V, stepping down to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V covers high-fault industrial services where the available short-circuit current exceeds typical distribution panel ratings — useful for transformer secondaries or busway taps where SCCR coordination starts at 100 kA. Designed for motor protection, with integrated phase failure detection and a trip indicator. The basic switch (order code 3VA21405MN320AA0) is supplied, and the auxiliary switch configuration includes one auxiliary switch plus one trip alarm switch (HQ type). No undervoltage release, no ground-fault monitoring, no communication function — this is a straight thermal-magnetic MCCB for standalone motor branch circuits.
Panel fit and footprint
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard SENTRON 3VA2 frame footprint that drops into existing panel layouts without re-drilling mounting plates. The 86 mm depth leaves clearance behind the panel door for wiring ducts or busbar connections. Maximum power loss is 1.6 W, negligible for enclosure thermal calculations.