What it is and what it does
The Siemens SENTRON 3VA2063-5HN36-0JC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with a 187 kA interrupting capacity at 240 V — enough to handle high-fault utility feeds or transformer secondaries. It uses an ETU350 electronic trip unit for line protection, meaning the trip curve is adjustable and the breaker communicates no status over a bus (no communication function on this variant). The 63 A rating holds flat through 50 °C, then derates gradually to 53.55 A at 70 °C, so you don't lose headroom in a warm enclosure unless ambient exceeds 50 °C.
Breaking capacity and selectivity
Interrupting rating drops sharply with voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and only 3.4 kA at 690 V. That 3.4 kA at 690 V is the weak point — if your panel runs a 690 V line-up, this breaker is not the main; it's a downstream feeder with limited fault-clearing. For 400 V class systems the 121 kA rating gives solid selectivity headroom against upstream 63 A fuses or larger-frame MCCBs.
Built-in accessories and panel fit
This variant ships with a shunt trip (STL) for remote tripping and two HQ auxiliary switches for status feedback to a PLC or annunciator. No undervoltage release, no ground-fault module, no phase-failure detection — those are separate add-ons. The base switch is order code 3VA2063-5HN36-0AA0; the integrated auxiliary trip is 3VA9688-0BL32. Dimensions are 105 mm wide by 181 mm tall by 86 mm deep, which is the standard 3VA2 frame size — drops into the same DIN-rail or screw-mount footprint as other 3VA2 breakers. No trip indicator on the front, so fault diagnosis relies on the aux contact state or the ETU's internal log.