SENTRON 3VA2 MCCB with ETU850 — 400 A, 3-Pole, Line Protection
The Siemens 3VA2340-5KP32-0BL0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, configured as a 3-pole line-protection device with an ETU850 electronic trip unit. It carries a breaking capacity of 187 kA at 240 V, derating to 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — figures that govern its fault-interruption capability at the point of common coupling. The ETU850 release provides electronic overcurrent protection with adjustable trip settings, plus a communication function and other measurement functions for integration into a monitored distribution system.
The 400 A rating holds at ambient temperatures up to 50 °C; above that it derates linearly to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel with a 55 °C internal ambient, the effective continuous current is 375 A — a 6.25 % reduction that must be factored into the busbar and downstream conductor sizing. Dimensions are 138 mm wide, 248 mm high, and 110 mm deep — a standard 3-pole MCCB footprint that fits SENTRON 3VA2 mounting bases and busbar systems.