40 A MCCB with 121 kA interrupting capacity at 240 V
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.
Panel fit and mounting
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. The 70 mm depth is the dimension that matters most when clearing the enclosure door or adjacent wiring troughs. No undervoltage release, no communication function, and no ground-fault monitoring on this variant — it's a straight line-protection breaker with the TM210 release. If you need those options, you're looking at a different suffix in the 3VA family.
Breaking capacity across voltages
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.