MCCB with ETU550 — what the ratings mean for fit
The Siemens SENTRON 3VA2140-6JP36-0AA0 is a 3-pole molded case circuit breaker rated for 40 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The ETU550 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, which is what you want when coordinating downstream feeders in a distribution panel. Interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V, so it handles high-fault utility feeds without cascading upstream. The 86 mm depth and 105 mm width fit standard MCCB mounting footprints in SENTRON switchboards.
Panel integration and deployment context
Mounts into a SENTRON distribution panel or switchboard via the standard MCCB bolted connection — no DIN-rail adapter on this frame. The IP40 front protection means it is suitable for indoor panel environments where tools or fingers are unlikely to contact live parts; not rated for washdown or outdoor exposure. The communication function allows integration with a higher-level monitoring system, useful for selective coordination logging or remote trip indication in a plant power distribution network.
Selectivity and coordination notes
With an insulation voltage rating of 800 V and interrupting capacity that drops from 242 kA at 240 V to 3.7 kA at 690 V, the 3VA2140-6JP36-0AA0 is primarily a low-voltage distribution breaker for 240–480 V services. The ETU550 release supports zone-selective interlocking (ZSI) when paired with a compatible upstream breaker, which speeds fault clearing on a downstream fault while maintaining full selectivity on a high-level fault. The 1.6 W maximum power loss is negligible for panel thermal budgeting.