What this 3VA2063-5HN36-0KA0 brings to a panel
The Siemens 3VA2063-5HN36-0KA0 is a SENTRON 3VA2 molded case circuit breaker, rated for 63 A continuous current (Iu) across a 3-pole line-protection configuration. It carries an ETU350 electronic trip unit and an integrated shunt trip (STL) for remote opening — a common fit in distribution panels where you need selective coordination and a separate undervoltage or shunt release without adding external aux boxes. Breaking capacity hits 187 kA at 240 V AC and holds 121 kA at 415/440 V, then drops to 79 kA at 500 V and 3.4 kA at 690 V. That 187 kA at 240 V tells you this breaker is built for high-fault utility or transformer-secondaries where the available short-circuit current is serious — not a light-duty branch breaker. The ETU350 release gives you adjustable long-time, short-time, and instantaneous pickup, plus ground-fault capability if you add the optional module. No auxiliary contacts or communication module on this variant — it's a straight line-protection breaker with the shunt trip as the only add-on release.
Thermal derating and panel fit
Rated 63 A from 40 °C through 50 °C; above that it derates linearly to 53.55 A at 70 °C. If your panel ambient runs hot — say 55 °C inside the enclosure — you're looking at 60.6 A continuous, so plan your load accordingly. Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — standard 3VA2 footprint. Mounts on DIN rail or panel-mount via the screw-on lugs. The 5.4 W max power loss is modest; no special ventilation required in a typical IP54 enclosure.