The Siemens SENTRON 3VA1140-4EF46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 40 A at 40 °C and an interrupting capacity of 121 kA at 240 V AC. The TM240 thermal-magnetic release handles overloads and short circuits without an undervoltage release or communication module — a straightforward, non-communicating breaker for main feeder or distribution panels.
Ratings that decide the fit
The 40 A rating holds flat through 50 °C, then derates to 39 A at 55 °C and 37 A at 70 °C — so in a warm enclosure you lose only a few amps, not a trip rating step. Interrupting capacity drops from 121 kA at 240 V to 75.6 kA at 415 V and 52.5 kA at 440 V, then settles at 11.9 kA from 500 V up to 690 V. That tells you this breaker is sized for 240–480 V distribution where fault currents are high; at 690 V it still clears 11.9 kA, enough for most industrial service-entrance duty. Rated insulation voltage is 800 V, so the breaker is rated for use in 690 V systems without derating the internal creepage. The front face carries IP40 protection — fine for a closed panel, but not for washdown or outdoor exposure without an enclosure.
Lifecycle and sourcing
This order code carries a current-production lifecycle status, so it is still in active manufacture. No successor or phase-out date is recorded. For a BOM freeze or a panel replacement, the part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.
Physical fit
The breaker measures 130 mm high, 101.6 mm wide, and 70 mm deep — a standard 4-pole MCCB footprint that mounts on a DIN rail or panel-mount adapter. No communication module or undervoltage release is fitted, so no extra wiring or addressing is needed for a basic feeder circuit.