What this MCCB carries
The Siemens SENTRON 3VA2163-7HN32-0HL0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current Iu of 63 A and an insulation voltage Ui of 800 V. Its ETU350 electronic trip unit gives you adjustable overload and short-circuit protection curves — no communication module, no ground-fault monitoring, just a clean thermal-magnetic replacement with electronic precision. The interrupting ratings tell the real story: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 5.25 kA at 690 V. That 330 kA figure at 240 V means it handles faults upstream of a large transformer or bus riser without cascading — the SCCR headroom is there for high-fault panels.
Thermal derating and panel fit
Full 63 A rating holds through 50 °C ambient. At 55 °C it derates to 60.6 A, at 60 °C to 58.3 A, at 65 °C to 55.9 A, and at 70 °C to 53.6 A. If your panel runs hot — say a packed enclosure near a furnace line — factor that curve into your load schedule. The 86 mm depth, 105 mm width, and 181 mm height fit standard SENTRON 3VA panel cutouts; no rework needed if you're swapping a 3VA frame. Maximum power loss is 4 W — negligible for thermal budgeting in a multi-breaker panel, but worth noting if you're stacking breakers in a sealed enclosure with no forced airflow.
Auxiliary and trip configuration
This variant ships with a shunt trip (STL) for remote tripping and a full auxiliary contact set: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration). The integrated auxiliary trip module is order code 3VA9688-0BL30, and the supplied basic switch is 3VA2163-7HN32-0AA0 — useful to know if you're stocking spares for the contact block. No undervoltage release, no phase failure detection, no communication function. This is a straightforward line-protection breaker with a voltage trigger for remote trip — not a power monitoring node.