SENTRON 3VA2140-5HM36-0AA0 — 40 A MCCB, Line Protection, 187 kA at 240 V
The Siemens 3VA2140-5HM36-0AA0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for a continuous current of 40 A, designed for line protection in distribution panels. Its interrupting capacity reaches 187 kA at 240 V, tapering to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — the voltage-dependent curve governs where it can be applied as the main or branch breaker. Rated insulation voltage is 800 V.
What the interrupting ratings mean for panel fit
The 187 kA at 240 V is the headline — this breaker can handle very high available fault currents at low-voltage transformer secondaries. At 415 V and 440 V the 121 kA rating still covers most industrial switchboards; at 500 V the 75.6 kA handles large motor control centers. The sharp drop to 3.7 kA at 690 V means it is not suited for 690 V distribution with high fault capacity — that is a niche application, and the 3VA2 family has other frame sizes for it. The 40 A continuous rating is flat across the full ambient range from 40 °C to 70 °C — no derating needed in a warm enclosure.
Dimensions and panel integration
Footprint is 105 mm wide by 181 mm tall, with a depth of 86 mm behind the panel. The 105 mm width fits a standard 3-pole MCCB cutout in most switchboard chassis; the 86 mm depth leaves clearance for rear-connected bus bars or cable lugs in a typical 400 mm deep enclosure.