What this MCCB carries and what it means for your panel
The Siemens SENTRON 3VA2063-6HN32-0KH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current, with a breaking capacity of 242 kA at 240 V and 187 kA at 415 V — numbers that put it in the high-interrupting tier for industrial distribution, not a general-purpose feeder breaker. That 242 kA at 240 V tells you this breaker is sized for high-fault locations — main switchboard incoming, transformer secondary, or a bus where the available fault current is well above what a standard 25 kA or 65 kA MCCB can handle. The ETU350 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves, so selectivity coordination downstream is actually achievable without guessing at thermal-magnetic tolerances.
Physical fit and mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a 3-pole 3VA2 frame that mounts on a DIN rail or screws directly to a backplate. At 86 mm depth, it fits enclosures with room for rear-connected busbars or cable lugs.
Trip unit and auxiliary wiring
The ETU350 electronic trip unit includes a shunt trip (STL) release for remote tripping, and the auxiliary contact block provides 2 auxiliary switches plus 1 trip alarm switch (HQ configuration) — enough for status feedback to a PLC or SCADA without an extra interposing relay. Maximum power loss is 5.4 W, so thermal rise in a crowded panel is manageable — no forced cooling required for the breaker itself.