What this MCCB carries
The Siemens SENTRON 3VA2140-8JQ32-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current, with an adjustable thermal-magnetic trip unit covering 60 A minimum to 480 A maximum — so it covers a wide range of downstream loads from a single frame size. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — that SCCR headroom means it can sit upstream in high-fault panels without cascading failure. Rated insulation voltage is 800 V, and the operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. It carries a communication function onboard and a ground-fault monitoring version using summation current formation on the L-conductor — useful for feeding status into a BMS or PLC without an add-on module.
Panel fit and dimensions
The 3VA2140-8JQ32-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA frame footprint that drops into existing DIN-rail or panel-mount layouts without re-drilling gland plates. Maximum power loss is 1.2 W, so heat buildup in a dense enclosure is negligible; no forced cooling required for this single breaker.