What this MCCB brings to the panel
The Siemens SENTRON 3VA2163-5JP32-0DL0 is a 3-pole molded case circuit breaker rated for 63 A continuous current at 40 °C, with an interrupting capacity of 187 kA at 240 V — that's the number that decides whether it clears a high-fault bolted fault without welding its contacts shut. At 415 V and 440 V it still holds 121 kA, and at 690 V it's rated 4.25 kA, so the SCCR headroom drops fast once you push above 500 V. The ETU550 electronic trip unit gives you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — this isn't a thermal-magnetic fixed-trip breaker; you dial in coordination with downstream feeders. It ships with an undervoltage release (UVR) wired in, plus a full auxiliary contact block: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch HQ. That means the panel builder gets remote status and shunt-trip capability without ordering separate add-on modules. The UVR drops the breaker if control voltage falls below dropout — common on safety circuits where a loss of control power must kill the load.
Thermal derating and real-world current
The 63 A rating holds flat from 40 °C up to 50 °C — no derating needed in a warm enclosure. At 55 °C it drops to 60.6 A, at 60 °C to 58.3 A, and at 70 °C to 53.6 A. If your panel ambient runs above 50 °C, size the breaker for the derated value, not the nameplate 63 A. The maximum power loss is 6.5 W, so heat buildup inside the enclosure is manageable even in a dense row of breakers. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage minimum matters if the breaker sits in an unheated warehouse before installation — it's fine down to -40 °C, but let it warm above -25 °C before energizing.
Mechanical fit and panel integration
Dimensions: 86 mm deep, 105 mm wide, 181 mm tall. That's the standard 3VA2 frame size — same bolt pattern and busbar spacing as the rest of the 3VA2 line. If you're replacing a 5SQ2370-2YA05 or similar frame, check the mounting centers; the 3VA2 uses a different footprint than the older 3VF or 5SQ series. The 20,000-cycle mechanical endurance is typical for a panel-mounted MCCB — fine for infrequent switching, not a daily disconnect duty cycle. The auxiliary contact block is factory-integrated: 2 form-C aux switches, 1 trip alarm, 1 electrical alarm. That saves a DIN-rail slot versus a separate auxiliary module. The undervolture release is also factory-installed — no field wiring of a shunt trip module. For the commissioning engineer: verify the UVR coil voltage matches your control circuit before applying power; the UVR will hold the breaker closed only when its coil is energized.