What this MCCB delivers in the panel
The Siemens 3VA1040-4ED32-0JC0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. It carries a 40 A continuous rating at 40 °C ambient, holding that full rating up to 50 °C before a gentle thermal derate begins — at 55 °C it's still good for 38.4 A, and at 70 °C it delivers 36 A. That thermal stability means you can pack it into a warm enclosure without oversizing the frame. Interrupting capacity is the headline here: 121 kA at 240 V, 75.6 kA at 415 V, and still 11.9 kA at 690 V. For a 40 A frame, those numbers give serious SCCR headroom — it can sit upstream of a high-fault panel without needing a current-limiting fuse ahead of it. The 800 V rated insulation voltage (Ui) confirms it's built for 690 V systems with margin. The 3-pole design and 70 mm depth fit standard MCCB mounting footprints. Power loss runs 10.8 W maximum — modest enough that ventilation in a typical enclosure handles it without forced air.
Built-in accessories and release options
This variant ships with a shunt trip release (STL) for remote tripping and two auxiliary switches (HQ) for status feedback to a PLC or annunciator. The basic switch assembly is order code 3VA10404ED320AA0. No undervoltage release, no ground-fault monitoring, no communication module — it's a straightforward line-protection MCCB with the most common add-ons already fitted.