What this MCCB carries
The SENTRON 3VA2040-8KP42-0AA0 is a 4-pole molded case circuit breaker rated 40 A continuous at 40 °C, and it holds that rating flat through 70 °C — no derate curve to chase. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — numbers that cover most industrial distribution panels without a series-rating dance. It's built around the ETU850 electronic trip unit, which gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — not a thermal-magnetic fixed curve.
Panel fit and footprint
Dimensions are 140 mm wide by 181 mm tall by 86 mm deep — a 4-pole MCCB that fits standard SENTRON mounting plates and busbar systems without overhang. Front face carries IP40 protection, meaning it's sealed against tools and wires over 1 mm but not washdown — keep it inside the enclosure, not on the panel door. Rated insulation voltage is 800 V, so it's comfortable in 480 V and 600 V class panels with margin to spare.
Communication and monitoring
This breaker includes a communication function and an 'other measurement function' — the ETU850 supports Modbus RTU via the SENTRON communication module, giving you load current, power, and energy data back to the PLC or BMS without a separate power meter. Maximum power loss is 1.2 W — negligible for thermal budgeting inside a sealed panel, but it means the internal current path is efficient.
Sourcing posture
Active lifecycle, standard catalog item. Sourced and quoted to order against an RFQ through independent distribution — availability and current pricing confirmed at quote time.