What this MCCB is and what it does
The Siemens 3VA2163-5HN32-0AB0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current on a 3-pole line protection design. Its breaking capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — so the interrupting rating you rely on shifts with system voltage, and at 690 V the available fault current must be kept under 3.7 kA for this breaker to clear safely.
Key ratings and what they mean for fit
The 63 A rating holds across the full ambient range from 40 °C to 70 °C — no derating curve to calculate for elevated panel temperatures. Insulation voltage is rated at 800 V, so the breaker is suitable for 690 V line-to-line systems with headroom. Maximum power loss is 4 W, a figure to include in enclosure thermal calculations. Dimensions are 181 mm high, 105 mm wide, and 86 mm deep. The 105 mm width is standard for a 3-pole MCCB in this frame class; verify panel cutout and busbar spacing against those numbers.