MCCB with ETU550 trip unit — 40 A, 4-pole, line protection
The Siemens SENTRON 3VA2040-8JP46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, designed for line protection in distribution panels. The ETU550 electronic trip unit provides adjustable overload and short-circuit protection with communication capability, making it suitable for selective coordination studies in industrial switchgear. Breaking capacity reaches 440 kA at 240 V AC, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — figures that cover most industrial fault-current scenarios without cascading upstream. Rated insulation voltage is 800 V, and the front face carries IP40 protection — suitable for enclosed panel mounting where the breaker is not exposed to dust or liquid ingress.
Integration and mounting
Dimensions are 86 mm deep, 140 mm wide, and 181 mm high — a standard 4-pole MCCB footprint that fits most Siemens SENTRON panelboards and third-party enclosures with compatible busbar spacing. The ETU550 trip unit supports communication functions, allowing integration with energy management systems for remote monitoring and trip-event logging.