Rated current and breaking capacity — what they mean for your panel
The 3VA2163-7HN32-0KC0 is a Siemens SENTRON molded case circuit breaker rated for 63 A continuous current across the full ambient temperature range from 40 °C to 70 °C — no derating required up to that ceiling. That 63 A holds steady at every 5 °C increment, so the breaker delivers its full nameplate rating in a warm enclosure without a temperature correction factor. Breaking capacity is 330 kA at 240 VAC, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. The 330 kA figure at 240 V is the headline number — it tells you this breaker can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream. For a 480 V panel fed by a large transformer, the 242 kA at 440 V is the more relevant spec; the steep drop to 3.7 kA at 690 V means this is not a 690 V main breaker — it is sized for 240–500 V distribution.
Line protection design with shunt trip and auxiliary switches
This variant is configured for line protection — the basic switch is order code 3VA2163-7HN32-0AA0, fitted with a shunt trip release (STL) for remote tripping and two auxiliary switches HQ for status feedback. The shunt trip lets a safety PLC or emergency-stop circuit open the breaker electrically; the auxiliary switches report open/closed position back to the control system. No undervoltage release, no ground-fault monitoring, no communication function on this unit. Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard 3-pole MCCB footprint that fits SENTRON panel-mounting and DIN-rail adapters. The 105 mm width is the critical panel cutout dimension; verify it matches your existing bus-bar spacing or mounting base before committing the BOM line.