What the ratings mean for fit
The 3VA1040-3ED32-0AH0 is a Siemens SENTRON molded case circuit breaker (MCCB) sized for line protection in distribution panels. Its 40 A rating holds across the 40 °C to 50 °C band without derating — at 55 °C it's still good for 38.4 A, and at 70 °C it delivers 36 A. That thermal continuity means you can mount it in a warm cabinet without stepping up a frame size. The TM210 thermal-magnetic trip unit handles overload and short-circuit response in one package; no separate ground-fault module here. Breaking capacity is the headline number for selectivity work. At 240 V it interrupts 75.6 kA; at 415 V that drops to 52.5 kA, and at 690 V it's still 7.5 kA. For a 40 A frame those are high-interrupt values — you can coordinate downstream of a larger upstream breaker without worrying about cascading failure during a bolted fault. Rated insulation voltage is 800 V, so the 690 V rating is within the design envelope. The auxiliary switch configuration ships with two auxiliary switches plus one trip alarm switch (HQ). That gives you a remote status signal for both the breaker position and the trip event — useful for PLC-based monitoring or for triggering an alarm on a critical feeder.
Panel integration and physical fit
The 3VA1040-3ED32-0AH0 occupies a 76.2 mm wide footprint on the DIN rail, 130 mm tall, 70 mm deep. Three-pole construction, so it fits standard 3-phase distribution sections. Power loss is 10.8 W maximum — negligible for thermal budgeting in a populated enclosure but worth noting if you're packing breakers side-by-side at full load.