The Siemens 3VA2163-5HN36-0BC0 is a SENTRON molded case circuit breaker (MCCB) rated for 63 A continuous current across its full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal calculations for a standard 65 °C switchroom. Interrupting capacity hits 187 kA at 240 V, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. Three-pole construction with an undervoltage release (UVR) built in, plus two HQ auxiliary switches for status feedback. The UVR drops the breaker if control voltage falls below the dropout threshold — standard for emergency-stop circuits or undervoltage protection on motor feeders where restart after a dip is undesirable. Designed for line protection — not motor protection, not feeder protection with ground-fault monitoring. This variant omits the ground-fault module, so if your spec calls for GF protection on a 63 A feeder, you need the -8HM32 sibling or an external relay.
Integration — panel fit and wiring constraints
The 70 °C operating ceiling matches the continuous-current rating table, so no hidden derating curve to chase for high-ambient installations like rooftop enclosures or boiler rooms.
What the auxiliary switch complement means for your control circuit
Two HQ auxiliary switches are included — HQ denotes high-rupturing-capacity contacts rated for control-circuit isolation without welding on inductive loads. The basic switch assembly carries order code 3VA21635HN360AA0 if you ever need to replace just the switching mechanism. No communication function on this variant — no Modbus, no PROFIBUS, no IO-Link. If remote trip indication or energy monitoring is required, look at the -8HM32 or other SENTRON 3VA2 variants with the communication module option.