63 A MCCB with ETU550 — fit and ratings
The Siemens 3VA2063-7JP32-0AA0 is a SENTRON 3VA2 molded case circuit breaker rated for 63 A continuous current across the full ambient range from -25 °C to 70 °C, with no derating required up to 70 °C. The 3-pole unit carries an ETU550 electronic trip unit, which provides adjustable overload and short-circuit protection curves suitable for line protection in distribution panels. Its interrupting capacity reaches 242 kA at 415 V, sufficient for high-fault installations where upstream transformer capacity demands a robust withstand rating. The 105 mm width and 86 mm depth fit standard SENTRON 3VA2 panel cutouts and busbar arrangements; the 181 mm height leaves clearance for cable entry from above or below. Front-face protection is IP40, meaning tools and fingers are kept out but the unit is not sealed against moisture — suitable for indoor switchboards, not washdown environments. Rated insulation voltage is 800 V, so the breaker can be applied in 690 V line-to-line systems with adequate clearance. The unit includes communication functionality via the SENTRON 3VA2 communication module slot.
Interrupting capacity across voltage levels
The breaker's interrupting capacity varies with system voltage: 330 kA at 240 V, 242 kA at both 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. The steep drop at 690 V reflects the physical limits of the arc-extinction chamber at elevated voltage; for 690 V applications, verify the available fault current does not exceed 3 kA. The minimum rated current is 95 A, and the maximum is 756 A, defining the trip-unit adjustment range.