What this breaker is and what the ratings mean
The Siemens 3VA2063-5HN36-0DL0 is a 3-pole IEC molded-case circuit breaker in the 3VA2 frame, sized for line protection with an ETU350 electronic trip unit configured for LSI (long-time, short-time, instantaneous) protection. The rated current In is 63 A, with overload protection Ir adjustable from 25 A to 63 A, short-time pickup Isd from 1.5 to 10 times Ir, and instantaneous pickup Ii fixed at 12 times In. The breaking capacity Icu is 55 kA at 415 V AC — that is the maximum fault current it can safely interrupt, which puts it in the 'M' (medium) breaking class for this frame. This matters for selectivity: you can coordinate it downstream of a higher-rated upstream breaker to clear a fault without taking the whole panel out.
Built-in accessories and wiring note
This variant ships with an undervoltage release (UVR) rated for 208–230 V AC, 50/60 Hz, plus two auxiliary switches HQ and one trip alarm switch HQ, plus one electrical alarm switch. The UVR drops the breaker when control voltage falls below the dropout threshold — standard for safety circuits that need a guaranteed open on loss of control power. The clamp connection terminals accept copper conductors without lugs, which speeds panel wiring. All accessories are factory-installed; no field-kit assembly required.