What it is and what it does
The Siemens SENTRON 3VA1140-6ED46-0AA0 is a 4-pole molded case circuit breaker (MCCB) designed for line protection — the main disconnect and fault interrupter in a distribution panel, motor control center, or switchboard. It carries a TM210 thermal-magnetic overcurrent release, meaning it uses a bimetal strip for overload protection and a solenoid for short-circuit response, with no electronic trip unit or communication module. Rated 40 A continuous at 40 °C, it holds that rating through 50 °C, then derates to 39 A at 55 °C and 37 A at 70 °C — useful to know if this breaker lives in a hot enclosure next to other heat sources. The interrupting ratings are where this breaker earns its keep: 220 kA at 240 V, 154 kA at 415 V, 121 kA at 440 V, and 17 kA at both 500 V and 690 V. That 220 kA figure at 240 V tells you it's built for high-fault-current applications — large transformer secondaries, utility service entrances, or industrial feeders where available fault current is well above what a standard 10 kA or 25 kA MCCB could handle. The 17 kA at 690 V is still respectable for a 40 A frame at that voltage class.
Physical fit and panel integration
This breaker measures 70 mm deep, 101.6 mm wide, and 130 mm tall — a standard SENTRON 3VA frame size that drops into the same DIN-rail or panel-mount footprint as other 3VA breakers. The front face carries an IP40 protection class, so it's fine for a dry indoor panel but not for washdown zones or outdoor cabinets without a secondary enclosure. At 10.8 W maximum power loss, heat dissipation is modest; you won't need forced ventilation in a typical 600 mm x 800 mm enclosure, but it's worth accounting for if you're packing several breakers side by side.
What the ratings mean for your installation
The 800 V rated insulation voltage means this breaker can be used in 690 V systems without de-rating the insulation path — common in industrial plants with 690 V motor feeds. The TM210 release is a fixed thermal-magnetic design: the thermal element is calibrated for the 40 A frame, and the magnetic pickup is factory-set. There's no undervoltage release, no shunt trip, no ground-fault monitoring, and no communication function on this variant — it's a straight line-protection breaker. If you need those accessories, you're looking at a different suffix in the 3VA family.