63 A MCCB with ETU350 — high interrupting capacity for line protection
The Siemens SENTRON 3VA2163-7HN32-0CL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current with an ETU350 electronic trip unit, configured for line protection. Its interrupting capacity reaches 330 kA at 240 V and 242 kA at 415 V, which means it can safely clear very high fault currents typical of large transformer secondaries or bus-duct feeds without cascading upstream — the kind of SCCR headroom a site electrical engineer needs for a selective coordination study. The breaker carries a 20 000-cycle mechanical endurance, so it holds up in frequent-switching applications like pump or compressor panels where the disconnect is cycled daily. The auxiliary contact configuration is 2 auxiliary switches plus 1 trip alarm and 1 electrical alarm switch (HQ type), giving the PLC or BMS four discrete status points: open/closed, tripped on fault, and a separate electrical alarm signal.
The breaker holds its full 63 A rating up to 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. In a sealed, non-ventilated enclosure the panel builder should account for the 6.5 W maximum power loss when sizing internal temperature rise. Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA footprint that drops into existing DIN-rail or screw-mount panel layouts without re-drilling.