What this MCCB does on a line
The Siemens 3VA2063-5JP32-0AA0 is a SENTRON molded case circuit breaker sized for line protection — 63 A continuous, 3-pole, with an ETU550 electronic trip unit. That trip unit gives you adjustable overload and short-circuit protection curves, plus a communication function for remote monitoring or integration into a higher-level control system. Rated insulation voltage is 800 V, so it handles 480 V and 600 V class distribution panels without derating the insulation.
Breaking capacity — the number that decides fit
This breaker's interrupting rating changes with system voltage, and the spread matters for panel coordination. At 240 V it clears 187 kA — that's a very high fault-current capability for a 63 A frame, typical for a main or large feeder breaker. At 415 V and 440 V it's still 121 kA. At 500 V it drops to 75.6 kA. At 690 V it's 3 kA, which is essentially a low-fault backup rating; you wouldn't spec this for a 690 V main unless the available fault current is known to be under 3 kA.
Thermal derating — or lack of it
The continuous current rating holds flat at 63 A from 40 °C all the way up to 70 °C ambient. That's unusual — most MCCBs start derating above 40 °C. The ETU550 electronic trip compensates electronically, so you don't lose capacity in a warm enclosure. If your panel runs hot, this breaker keeps its full 63 A rating.
Panel fit — dimensions and mounting
The 3VA2063-5JP32-0AA0 measures 105 mm wide, 181 mm tall, and 86 mm deep. That's a standard 3-pole MCCB footprint for the SENTRON 3VA platform — it mounts on a DIN rail or directly to a backplate via the breaker's own mounting lugs. The IP40 front protection means it's fine for a closed panel; no special sealing needed for the operator interface.