The Siemens 3VA1140-3GD46-0AA0 is a SENTRON molded case circuit breaker rated for 40 A continuous, with four poles and a TM210 thermal-magnetic release. It's designed for line protection in distribution panels — no communication module, no ground-fault monitoring, no undervoltage release. The interrupting ratings step down from 75.6 kA at 240 V to 52.5 kA at 415 V, then 32 kA at 440 V, and settle at 11.9 kA at both 500 V and 690 V.
What the ratings mean for fit
The 40 A rating holds flat from 40 °C up to 50 °C — no derating needed in a warm enclosure at those temperatures. At 55 °C it drops to 39 A, and by 70 °C it's at 37 A. That thermal curve matters if this breaker sits near other heat sources on the DIN rail; a panel builder should check the ambient at the breaker's location, not just the room ambient. The TM210 release is a fixed thermal-magnetic type — no interchangeable trip units, no adjustment dial. You spec the breaker for the load, not the other way around. Rated insulation voltage is 800 V, so it's comfortable on 400 V and 480 V systems with headroom. IP40 on the front means it's protected against tools and wires larger than 1 mm, but not against water. Fine for a dry indoor panel; not for a washdown zone. No trip indicator means you won't get a visual flag when it opens — the handle position is your cue.
Panel integration notes
The 3VA1140-3GD46-0AA0 measures 70 mm deep, 101.6 mm wide, and 130 mm tall — a four-pole MCCB that fits a standard distribution panel footprint. Mounts on DIN rail or can be screw-fixed with the optional base adapter. Maximum power loss is 10.8 W, so factor that into enclosure thermal calculations if you're packing several breakers side by side.