The 3-pole design covers three-phase line protection. Interrupting capacity sits at 121 kA at 240 V AC and 75.6 kA at 415 V AC, giving solid SCCR headroom for most industrial distribution panels without cascading upstream. The auxiliary contact block provides two form-C aux switches plus a separate trip alarm contact, so the PLC or SCADA knows the breaker state without adding a separate module. Thermal derating is flat from 40 °C to 50 °C — still 40 A — then drops to 38.4 A at 55 °C and 36 A at 70 °C.
The mechanical endurance rating of 15 000 operations is typical for a 40 A MCCB in panel service — not a daily-switching contactor, but fine for infrequent disconnect or backup protection.
Width 76.2 mm (roughly 3 inches of DIN rail space), depth 70 mm, height 130 mm. That's a standard SENTRON 3VA footprint — drops into the same cutout as other 3VA 3-pole frames.
Interrupting capacity at a glance
The 121 kA at 240 V is the headline number, but the 75.6 kA at 415 V is the one that matters for 400 V class panels — that's well above typical utility fault levels in most industrial plants.