The Siemens SENTRON 3VA2063-8KP36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, built around the ETU850 electronic trip unit. It's designed for line protection in distribution panels, with an interrupting capacity of 440 kA at 240 V AC — enough to handle high-fault utility feeds without cascading upstream. The ETU850 brings communication capability, so this breaker can report status and trip events back to a BMS or PLC over the plant network, which is the main differentiator from a thermal-magnetic MCCB in the same frame.
Interrupting capacity and selectivity
The interrupting ratings step down cleanly with voltage: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V (–). At 690 V the 52.5 kA figure still covers most industrial service-entrance faults. The ETU850's electronic trip allows adjustable I²t curves, so an engineer can coordinate this breaker with downstream 3VA feeders — selectivity is achievable down to about 80% of the upstream instantaneous setting, typical for electronic trip MCCBs.
Lifecycle and sourcing posture
The lifecycle stage is marked current, meaning Siemens still actively manufactures this order code. No last-time-buy or phase-out notice is available.
Mounting and panel fit
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep (–). It mounts on a DIN rail or directly to a backplate via the four mounting slots on the frame. The front face carries an IP40 protection class, so it's suitable for enclosed panel installation where tools or fingers won't contact live parts. At 63 A continuous and 3 W maximum power loss, heat dissipation is low enough that standard panel ventilation suffices — no forced cooling required in most enclosures.