The Siemens 3VA2140-5MN32-0AA0 is a SENTRON molded case circuit breaker designed specifically for motor protection — not a general-purpose feeder breaker. It carries a continuous current rating of 40 A across the full ambient range from 40 °C up to 70 °C, so no derating headache when the panel gets warm. Three poles, phase failure detection built in, and adjustable trip classes 10A, 10E, and 20E let you match the thermal curve to the motor start profile — 10A for quick-start pumps, 20E for high-inertia loads like centrifuges or conveyors.
Breaking capacity — what the numbers mean for your panel
At 240 V this MCCB interrupts 187 kA — that's well into industrial-grade SCCR territory, meaning it can ride through a major fault without upstream coordination issues. At 415 V and 440 V it still holds 121 kA, and at 500 V it manages 75.6 kA. The 690 V figure drops to 3.7 kA, so verify your system voltage against that curve before specifying for 690 V applications.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB footprint for DIN-rail or screw-mount panels. The 86 mm depth (3.39 in) means it clears most shallow enclosures without a deep gland plate. Rated insulation voltage is 800 V, so it's comfortable in 480 V and 600 V class panels with headroom. Maximum power loss is 1.6 W — negligible heat contribution inside the cabinet.