What the ratings mean for your panel
The Siemens SENTRON 3VA2163-5HL36-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 63 A at 40 °C ambient. That 63 A holds flat through 50 °C — only starts to derate above 55 °C, hitting 53.55 A at 70 °C. For a 63 A feeder in a warm enclosure, that thermal curve buys you margin. Breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. That 187 kA at 240 V means it handles a very high available fault current — common on large transformer secondaries or busway taps — without needing an upstream current-limiting fuse. The 121 kA at 415 V covers most industrial 400 V distribution panels. The ETU320 electronic trip unit gives you adjustable overload and short-circuit protection curves. It's paired with a shunt trip (STL) release for remote opening, plus two auxiliary switches and one trip alarm switch — enough to signal status back to a PLC or annunciator panel without adding a separate auxiliary block.
Panel fit and footprint
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for this class — it fits existing SENTRON 3VA mounting bases and busbar connections without adaptor plates. The 86 mm depth includes the rotary handle and terminal covers; verify clearance against the enclosure door or gland plate if you're retrofitting into a tight panel.