400 A MCCB with shunt trip — line protection for high-fault panels
The Siemens SENTRON 3VA2340-5KP32-0HA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current, designed for line protection in distribution panels. It carries a shunt trip release (STL) for remote tripping, and includes a communication function for integration into monitored systems. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — so at typical 400 V class distribution voltages it clears fault currents up to 121 kA without cascading upstream breakers. Thermal derating is minimal up to 50 °C (full 400 A), then drops to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. That means in a warm panel — say 55 °C ambient — you lose 25 A of headroom; plan the load accordingly.
Panel fit and dimensions
Dimensions are 248 mm high × 138 mm wide × 110 mm deep. That 110 mm depth is the body only — allow clearance for the shunt trip wiring and any communication module pigtails. The 138 mm width is standard for a 3-pole frame in this class; it occupies one 3-pole position in a SENTRON distribution panel.
Environmental and electrical limits
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 96 W — that's the heat to vent in an enclosed panel. The breaker includes a voltage trigger for undervoltage or overvoltage sensing, but no undervoltage release is fitted as standard.