What it is and what it does
This is a Siemens SENTRON 3VA2063-5HL36-0DH0, a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current across its full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. It's a line-protection design, so it's the main overcurrent guard between the transformer or bus and a downstream distribution panel. The interrupting capacity is what earns its place: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That means it can safely clear a fault at the service entrance or in a high-fault industrial mains panel without cascading upstream. It carries an undervoltage release (UVR) built in, and the auxiliary switch complement is two auxiliary switches plus one trip alarm switch HQ — enough to signal status back to a PLC or annunciator panel.
Panel fit and mounting
Mounts on a DIN rail or can be screw-fixed to a backplate. The footprint is 105 mm wide, 181 mm tall, 86 mm deep — a three-pole frame that fits standard 200 mm-deep enclosures with room for wiring gutters. The 63 A rating means it uses a 63 A frame (not a 100 A frame), so it's compact for its interrupting class. No communication module on this variant — it's a standalone breaker, not a smart metering unit. If you need remote trip indication, the HQ alarm switch covers that.