Siemens SENTRON 3VA2140-6HK36-0AA0 — 40 A MCCB with ETU340 Trip
The 242 kA at 240 V is the ultimate short-circuit current the breaker can interrupt without welding or rupturing — that's the SCCR for a 240 V delta or 277/480 V wye service entrance. At 415/440 V it still holds 187 kA, which covers the high-fault end of a 400 V industrial distribution. The ETU340 is an electronic trip with an LSI curve: long-time pickup adjustable from 0.4x to 1.0x In (16 A to 40 A), short-time pickup and delay for selective coordination downstream, and instantaneous fixed at 10x In (400 A). That means you can set it to ride through motor inrush and still clear a bolted fault in under 100 ms.
Physical Fit — DIN Rail or Direct Mount
Mounting is via four M6 screws on a backplate or onto a DIN rail adapter (sold separately). Panel builders: plan for 105 mm per pole width plus 5 mm side gap for heat dissipation.