What this MCCB delivers on the panel
The Siemens 3VA1040-3ED36-0AA0 is a 3-pole SENTRON molded case circuit breaker rated for 40 A continuous current at 40 °C, with a TM210 thermal-magnetic release that handles overload and short-circuit protection in a single compact package. Breaking capacity reaches 75.6 kA at 240 V AC, stepping down to 52.5 kA at 415 V and 32 kA at 440 V — enough headroom for most industrial distribution panels where high fault currents are a concern. At 690 V the breaker still clears 7.5 kA, so it can serve as a line-side disconnect in 690 V drives or transformer circuits where the available fault current stays within that limit.
Thermal derating and panel fit
The 40 A rating holds steady up to 50 °C ambient; above that it derates gradually to 37 A at 70 °C. If the panel runs hot — say near a drive bank or transformer — factor the 65 °C figure of 38 A into your bus sizing. Dimensions are 130 mm tall, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without re-drilling. Front face carries IP40 protection, adequate for a clean indoor panel; no ground-fault monitoring or motor-drive option is built in, so this is a straight line-protection breaker.
Lifecycle and sourcing posture
Rated insulation voltage is 800 V, and the maximum operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. The breaker is designed for fixed installation without communication or neutral conductor retrofits.