MCCB for line protection — 40 A, 4-pole, ETU350
The Siemens SENTRON 3VA2040-7HN46-0AA0 is a 4-pole molded case circuit breaker rated for 40 A continuous current, designed for line protection in distribution panels. It carries the ETU350 electronic trip unit, which provides adjustable overload and short-circuit protection curves — a step up from thermal-magnetic breakers for selectivity coordination. Rated insulation voltage is 800 V, and the interrupting capacity reaches 330 kA at 240 V AC, 242 kA at 415/440 V, and 187 kA at 500 V — figures that give substantial headroom for high-fault installations. At 690 V the rating drops to 3 kA, so confirm the available fault current at that voltage before specifying.
Panel fit and thermal profile
Dimensions are 181 mm high, 140 mm wide, 86 mm deep — a 4-pole MCCB that fits standard SENTRON 3VA panel footprints. Front protection is IP40, suitable for enclosed distribution boards where the cover provides the environmental seal. The continuous current rating holds at 40 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that temperature. Maximum power loss is 1.2 W per pole, low enough that internal cabinet heating is negligible for most layouts. Operating temperature range is -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The storage minimum matters for unheated warehouses in cold climates — the breaker can sit at -40 °C without damage.
Sourcing and compliance
This is a current-production Siemens SENTRON 3VA series MCCB. It is sourced and quoted to order against an RFQ through independent distribution channels; availability and current pricing are confirmed at quote time. The breaker carries no undervoltage release, no shunt trip, no communication function, and no ground-fault monitoring — it is a straight line-protection device. The trip indicator is also absent, so fault indication relies on the panel's upstream signaling.