63 A MCCB with ETU550 — breaking capacity and thermal curve
The Siemens 3VA2163-5JP32-0HA0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current, with an ETU550 electronic trip unit configured for line protection. The interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V — so the high short-circuit ratings at typical distribution voltages mean this breaker can sit close to the transformer without needing upstream current-limiting fuses. Thermal derating is minimal up to 50 °C (full 63 A), then drops to 60.6 A at 55 °C, 58.3 A at 60 °C, 55.9 A at 65 °C, and 53.6 A at 70 °C. That curve matters when the breaker lives in a crowded panel or near heat sources — the 70 °C rating is still 85% of the nominal, so you don't lose much headroom in a warm enclosure.
Dimensions and panel fit
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — standard 3-pole MCCB footprint for the SENTRON 3VA2 frame. Mounts on a DIN rail or directly to a backplate; the depth leaves clearance for rear-connected busbars or cable lugs.
Trip unit and auxiliary options
The ETU550 electronic trip unit supports communication and includes a voltage trigger. A shunt trip (STL) auxiliary release is integrated, part number 3VA9688-0BL30. The basic switch element carries order code 3VA2163-5JP32-0AA0. No undervoltage release, no ground-fault monitoring, no auxiliary contacts are fitted on this variant. Rated insulation voltage is 800 V. Maximum power loss is 4 W. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Mechanical endurance is 20,000 operations.