What the ratings mean for fit
The 3VA2163-6HN36-0BC0 is a Siemens SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed up to 70 °C. That's unusual; most MCCBs start derating above 40 °C. The 242 kA breaking capacity at 240 V AC means it can safely interrupt a fault current that high without upstream devices having to clear it, which simplifies coordination studies on high-fault panels. At 415 V and 440 V it still holds 187 kA, and at 690 V it drops to 3.7 kA — so on a 690 V system the upstream fuse or breaker still needs to handle the heavy lifting. It's a 3-pole line-protection design with an integrated undervoltage release (UVR) and two HQ auxiliary switches built in. The basic switch variant is 3VA2163-6HN36-0AA0; the -0BC0 suffix adds the UVR and aux switches as a factory-assembled package. No communication function, no ground-fault monitoring — this is a plain thermal-magnetic MCCB for standard feeder or branch protection.
Panel fit and footprint
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard 3-pole MCCB footprint that drops into most Siemens SENTRON distribution panels and third-party enclosures with a 105 mm wide mounting cutout. The 6.5 W maximum power loss means it won't cook adjacent devices in a sealed enclosure, but still account for it in the thermal budget if you're packing the panel tight.