Line protection MCCB with ETU350 — what the ratings mean for fit
The Siemens 3VA2063-5HN32-0CL0 is a SENTRON molded case circuit breaker (MCCB) sized for line protection duty — 63 A continuous at 40 °C, 3-pole, with an ETU350 electronic trip unit. The interrupting capacity at 240 V (187 kA) and at 415 V (121 kA) puts it in the high-fault class for industrial distribution panels where available fault current exceeds typical 25–65 kA MCCB ratings. The 63 A frame holds its rating flat through 50 °C; above that it derates in 2.3625 A steps per 5 °C, reaching 53.55 A at 70 °C — relevant for enclosed switchboards with limited airflow. The ETU350 release provides adjustable overload and short-circuit protection curves without swapping trip units — a time-saver during commissioning when the load profile isn't finalised. The undervoltage release (UVR) is integrated (catalogue designation 3VA9608-0BB24), so the breaker drops open on loss of control voltage, which is standard for emergency-stop or safety-disconnect circuits that need a predictable fail-safe state. Auxiliary contact configuration ships as two auxiliary switches plus one trip alarm and one electrical alarm switch (HQ version) — enough to signal breaker status and trip cause back to a PLC or annunciator panel without adding external relay logic.
Panel integration — footprint and mounting
Mounts on a DIN rail or direct-panel via the 3VA screw-mount kit. Dimensions: 105 mm wide × 181 mm high × 86 mm deep.