What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1040-4ED32-0AH0 is a 3-pole molded case circuit breaker rated for 40 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release. At 240 V it interrupts 121 kA; at 415 V that drops to 75.6 kA, at 440 V to 52.5 kA, and at 690 V to 11.9 kA — so the available fault current at the panel's service entrance decides which voltage column governs your SCCR coordination study. This is the line-protection version — no undervoltage release, no shunt trip, no ground-fault module, no communication function, and no phase-failure detection built in. The auxiliary contact block is populated: 2 auxiliary switches plus 1 trip alarm switch (HQ type). If your BOM calls for a communicating breaker or a UVR-equipped unit, this variant won't deliver it without a field-installable accessory.
Thermal derating — where the 40 A holds and where it tapers
The 40 A rating is flat from 40 °C through 50 °C. At 55 °C it derates to 38.4 A, at 60 °C to 37.6 A, at 65 °C to 36.8 A, and at 70 °C to 36 A. If your panel ambient sits above 50 °C, the continuous current you can actually pull is lower than the nameplate — factor that into the load schedule before committing the BOM line.
Physical fit and panel integration
Dimensions: 70 mm depth, 76.2 mm width, 130 mm height. Front-face protection is IP40 — suitable for enclosed panel mounting where no water jets or dust ingress are expected. The 3-pole footprint matches the standard SENTRON 3VA frame; if your existing panel was cut for a 3VA1010 or 3VA1110 frame, verify the mounting centres against the 76.2 mm width before assuming a drop-in swap.
What the TM210 release means for coordination
The TM210 is a fixed thermal-magnetic release — the thermal element provides long-time protection (adjustable tr max 1 second), the magnetic element provides instantaneous short-circuit pickup. No electronic adjustment of the I²t curve; selectivity with downstream breakers depends on the fixed magnetic threshold. For a distribution board feeding motor starters or lighting panels, this is a standard choice — not a high-end electronic trip unit, but serviceable for most line-protection duties.