The Siemens SENTRON 3VA2063-5HN36-0JA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 63 A and an interrupting capacity of 187 kA at 240 V AC. That 187 kA rating means this breaker can safely clear a bolted fault at the main distribution board without upstream fuses needing to open — it holds selectivity at the service entrance. The interrupting curve drops to 121 kA at 415 V and 440 V, and to 79 kA at 500 V; at 690 V it still clears 3.4 kA, covering most industrial step-down transformer secondaries.
The ETU350 electronic trip unit on this MCCB provides adjustable long-time, short-time, and instantaneous protection curves — not a fixed thermal-magnetic. That matters when you need coordination downstream of a 2000 kVA transformer or want to set the short-time delay to ride through motor inrush without nuisance tripping. The shunt trip (STL) integrated auxiliary release lets a safety PLC or E-stop circuit open the breaker remotely, which is standard for emergency-off zones on conveyor or press lines.
Mounts on a standard DIN rail or can be screw-fixed to a backplate — the 105 mm width (three-pole) fits a 6-module unit space in a distribution board. Depth of 86 mm and height of 181 mm leave clearance for cable entry from below or busbar connection from the rear. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C, so it's fine for unheated electrical rooms. Power loss is 5.4 W max — negligible for thermal budgeting inside a panel.