What this MCCB carries and where it fits
The Siemens SENTRON 3VA2140-7JQ46-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, built for line protection in industrial distribution panels. Breaking capacity hits 330 kA at 240 V and 242 kA at 415 V and 440 V — numbers that keep it on the short-circuit duty of a heavy feeder or a mining substation tap. At 690 V the same breaker still clears 3.7 kA, so it handles the high-voltage end of a mill drive circuit without cascading upstream. Rated insulation voltage is 800 V, which covers 690 V line-to-line systems with headroom.
Thermal derating — flat across the panel ambient range
Continuous current holds at 40 A from 40 °C all the way to 70 °C ambient — no derating curve to calculate inside a hot enclosure. Operating temperature range is -25 °C to 70 °C; storage range stretches from -40 °C to 80 °C.
Dimensions and panel fit
Footprint is 140 mm wide, 181 mm tall, 86 mm deep — fits standard MCCB cutouts in a 4-pole format. The 4-pole body takes up the same width as most Siemens SENTRON 4-pole frames, so swapping into an existing panel with the same pole count should not require re-drilling the mounting plate.
Ground-fault and communication features
Ground-fault monitoring uses summation current formation on L + N conductors — catches residual current without a separate CT. A communication function is built in, which means this breaker can talk to a higher-level monitoring system for trip events and load data.