The Siemens SENTRON 3VA1040-4ED42-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, with a TM210 thermal-magnetic overcurrent release designed for line protection. Its interrupting capacity reaches 121 kA at 240 V AC, dropping to 75.6 kA at 415 V and 52.5 kA at 440 V — figures that govern its fault-clearing capability in low-voltage distribution panels. Rated insulation voltage is 800 V, and the breaker dissipates a maximum 10.8 W under full load — a figure worth checking against your panel's thermal budget if you're packing several units side by side on a DIN rail. Operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it handles typical indoor panel environments without derating concerns at standard ambient conditions.
Dimensions are 130 mm height, 101.6 mm width, and 70 mm depth — a 4-pole MCCB footprint that fits standard Siemens SENTRON panel cutouts and busbar systems. If you need those options, you're looking at a different suffix in the 3VA family.
The interrupting ratings tell the real story for fault coordination: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That steep drop above 440 V means you need to verify the available fault current at your system voltage — especially on 690 V circuits where the 11.9 kA ceiling may require upstream current-limiting fuses or a higher-rated frame.