63 A SENTRON MCCB with shunt trip — what the ratings mean for your panel
The Siemens 3VA2063-6HN32-0KA0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current, with a flat thermal derating curve from 40 °C through 70 °C — meaning it holds full 63 A across that entire ambient range without needing to upsize the frame. That matters for a crowded panel where internal temperature rises above 40 °C; you don't lose headroom. Breaking capacity is voltage-dependent: 242 kA at 240 VAC, 187 kA at 415/440 VAC, 121 kA at 500 VAC, and 3 kA at 690 VAC. The 242 kA figure at 240 V is exceptionally high for a 63 A frame — it handles high-fault utility feeds or transformer secondaries without cascading upstream. At 690 V the 3 kA limit means this is not the breaker for 690 V motor circuits unless the available fault current is very low. Rated insulation voltage is 800 V, so the internal clearances and creepage are sized for 690 V systems. The 3-pole design is configured for line protection (not feeder or motor protection), with a shunt trip (STL) auxiliary release built in — that allows remote tripping from an E-stop or safety relay, which is the usual integration point in a control panel.
Panel fit and dimensions
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint.