The Siemens SENTRON 3VA2140-6JP42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection at a continuous current Iu of 40 A. It carries the ETU550 electronic overcurrent release — a microprocessor-based trip unit that gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, meaning you can coordinate selectivity downstream without swapping hardware.
Breaking capacity and voltage levels
This breaker delivers 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V tells you this is a 500 V-class frame — fine for 400/480 V distribution, but if your system runs 690 V with high fault current, you need a different frame. The rated insulation voltage (Ui) is 800 V, so the bus work inside the breaker is rated for that level even if the interrupting rating at 690 V is modest.
Thermal performance — flat 40 A from 40 °C to 70 °C
The 40 A rating holds steady across the entire ambient range from 40 °C to 70 °C. No derating needed if your panel runs hot — that is unusual for a compact MCCB and simplifies panel layout when the breaker sits next to heat sources like drives or transformers.
Communication and integration
This variant has a communication function onboard, so it can talk to a higher-level control system via the SENTRON communication modules — useful for remote trip indication, load monitoring, and energy management without adding a separate power meter. The front face carries IP40 protection, fine for a clean indoor panel; keep it behind the enclosure door for washdown areas.