What this MCCB is and what it does
The Siemens SENTRON 3VA2163-5HN36-0AC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a rated insulation voltage of 800 V. It's designed for line protection — the primary job is to protect cable and bus from overload and short circuit in a distribution panel. The interrupting ratings are the headline: 187 kA at 240 V AC, 121 kA at 415 V, and still 75.6 kA at 500 V. That kind of high-fault capacity means it handles utility-grade fault currents without needing a current-limiting fuse upstream — saves a fuse holder and a coordination study.
What the ratings mean for your panel
The 63 A rating holds steady all the way from 40 °C up to 70 °C ambient — no derating curve to chase in a hot enclosure. That's unusual for an MCCB; most start dropping current above 40 °C. The 3-pole footprint is 105 mm wide, 181 mm tall, 86 mm deep — standard SENTRON 3VA2 frame size, so it drops into the same DIN-rail or screw-mount slot as its siblings. The auxiliary switch configuration is 2 HQ (high-quantity) switches, meaning two form-C contacts for status feedback to a PLC or alarm panel. No undervoltage release, no ground-fault monitoring, no communication module — this is a straight line-protection breaker with aux contacts.