What it is and what it does
The Siemens 3VA2163-5HN36-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection. It carries a continuous current of 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing in warm enclosures. The 3-pole design handles three-phase circuits, and the 187 kA interrupting capacity at 240 V means it can clear a high-fault bolted short without the arc flashing upstream. At 415/440 V that figure holds at 121 kA, still comfortably above typical industrial service-entrance fault levels.
What the ratings mean for fit
The 63 A frame is the deciding spec for BOM fit — if your load calculation lands at 60 A or below, this breaker lands squarely. The 756 A maximum/minimum figure in the spec table is the short-time withstand or instantaneous magnetic trip threshold, not the continuous rating; don't mistake it for the frame size. The undervoltage release (UVR) is factory-fitted on this variant, so if your safety circuit requires a UVR to drop the breaker on loss of control power, this order code saves a field-install accessory. The UVR release design is built into the supplied basic switch 3VA21635HN360AA0.
Panel fit and environment
Footprint is 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB envelope for a 63 A frame. Mounts on a DIN rail or panel-mount plate; the 86 mm depth leaves clearance behind a 200 mm deep enclosure door. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C, so it lives in unconditioned warehouses and rooftop panels without issue. Power loss is 6.5 W maximum — negligible for thermal budgeting inside a crowded cabinet.