What this MCCB delivers on the line
The Siemens 3VA1140-3EF36-0CA0 is a SENTRON molded case circuit breaker built for line protection in distribution panels. It carries a 40 A thermal-magnetic trip unit (TM240) at 40 °C ambient, holds the full 40 A through 50 °C, then derates to 37 A at 70 °C — so in a warm enclosure you lose only a few amps off the top. Breaking capacity hits 75.6 kA at 240 V AC, 52.5 kA at 415 V, and still delivers 11.9 kA at 690 V, giving you solid SCCR headroom for most industrial feeds. Three poles, 800 V rated insulation voltage, and a factory-fitted undervoltage release (UVR) — the UVR trips the breaker when control voltage drops, standard for motor feeder or safety disconnect circuits where you want automatic dropout on loss of pilot power. No ground-fault module, no communication function; this is a straight thermal-magnetic MCCB with a UVR add-on.
Panel fit and integration
Width is 76.2 mm (3 in), depth 70 mm (2.76 in), height 130 mm (5.12 in) — standard 3-pole MCCB footprint for a 40 A frame. Mounts on a DIN rail or direct panel; the UVR adds a few mm of projection but stays within the same cutout. Power loss at full load is 13.3 W, manageable in a sealed enclosure with basic ventilation. No trip indicator, no voltage trigger — if you need visual trip indication, factor in an auxiliary contact separately.
Breaking capacity across voltages
At 240 V: 75.6 kA. At 415 V: 52.5 kA. At 440 V: 32 kA. At 500 V and 690 V: 11.9 kA. That curve tells you the breaker is most comfortable on 240–415 V systems where it has massive fault-clearing headroom; at 690 V it still handles 11.9 kA, enough for most 690 V motor feeds unless you're near a large transformer.