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. 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.
The 3VA1040-3ED32-0JH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep.