What this MCCB carries and what it means for your panel
The Siemens 3VA1163-5EF32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated 63 A continuous at 40 °C and 3-pole, designed for line protection in distribution panels. Its breaking capacity hits 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V — so it handles high-fault utility feeds or transformer secondaries without cascading upstream. The frame holds a shunt trip (STL) and comes with 2 auxiliary switches plus 1 trip alarm switch HQ, giving you remote status and emergency trip capability. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with margin. Thermal derating is mild: it holds 63 A up to 50 °C, then drops only 1 A per 5 °C step to 58 A at 70 °C. That means you can load it near nameplate even in a warm enclosure without oversizing. Power loss at full load is 17.3 W — manageable for thermal coordination in a multi-breaker panel.
Mounting and integration notes
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that fits most Siemens SENTRON panelboards and switchgear. No special adapter plate needed for a typical distribution panel. The shunt trip (STL) and auxiliary switch block are factory-installed; verify the wiring diagram for your specific control voltage before energizing.