What this MCCB is and what it does
The Siemens 3VA2140-5MQ32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Three poles, designed specifically for motor protection, with integrated phase failure detection and a communication function for integration into higher-level monitoring. The 187 kA breaking capacity at 240 V AC gives substantial fault-interruption headroom for most industrial distribution panels; at 415 V it still holds 121 kA.
Sizing and selectivity for the panel builder
At 86 mm deep, 105 mm wide, and 181 mm tall, this MCCB fits standard SENTRON mounting footprints. The 40 A rating holds flat across the operating temperature range — no knock-down factor needed at 50 °C or 60 °C (–), which simplifies panel thermal budgeting. Maximum power loss is 1.6 W, low enough that adjacent devices see negligible heat rise. The ground-fault monitoring variant uses summation-current formation on the L-conductor, so verify the neutral conductor routing if you're wiring a 4-wire system through this 3-pole device.