What the ratings mean for your panel
The Siemens SENTRON 3VA1040-3ED32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A continuously at 40 °C, with no derating needed up to 50 °C — it holds the full 40 A through that range. Above 55 °C it steps down to 38.4 A, and at 70 °C ambient it still delivers 36 A. That thermal curve means you can mount it in a warm enclosure without losing headroom, as long as you stay under 50 °C ambient. The interrupting rating is 75.6 kA at 240 V, dropping to 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 400 V class panel, the 52.5 kA figure gives solid SCCR headroom for most distribution boards — you'd need a very high-fault utility feed to exceed that. The 7.5 kA at 690 V tells you this is a 400 V class breaker, not a 690 V main. It ships with a shunt trip release (STL) and a 2-auxiliary-switch + 1-trip-alarm-switch (HQ) configuration. That means you can remote-trip it from a safety circuit or PLC output, and get status feedback on both the breaker position and whether it tripped on fault. No undervoltage release, no ground-fault module, no communication function — this is a straightforward line-protection MCCB with a remote trip option.
Panel fit and footprint
The 3VA1040-3ED32-0JH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 3-inch width is standard for a 3-pole MCCB in this frame size — it occupies one 3-module-wide slot on a DIN rail or panel-mount plate. The 70 mm depth leaves room for rear-access wiring in a 200 mm deep enclosure without crowding the gland plate.