What this MCCB carries — and where it fits
The Siemens 3VA2063-5HL32-0JC0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 63 A continuous current at 40 °C, with three poles and an ETU320 electronic trip unit configured for line protection. The 187 kA interrupting capacity at 240 V and 121 kA at 415 V give it the headroom to handle high-fault utility feeds or transformer secondaries without cascading upstream. At 690 V it still clears 3.4 kA, so it covers 480Y/277 V and 600 V class panels within the same frame.
Ratings that govern the selection
The 63 A rating holds flat from 40 °C to 50 °C — no derating needed in a typical ventilated enclosure. Above 50 °C it steps down: 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. The rated insulation voltage of 800 V covers all common low-voltage system voltages up to 690 V phase-to-phase. Maximum power loss is 5.4 W per pole, which matters for thermal budgeting in a multi-breaker panel.
Trip unit and auxiliary hardware
The ETU320 is an electronic overcurrent release with LSI protection (long-time, short-time, instantaneous) — adjustable, so you can coordinate downstream breakers without oversizing the main. A built-in shunt trip (STL) allows remote tripping via a control signal. Two auxiliary switches (HQ) provide status feedback to a PLC or annunciator panel. No undervoltage release, no ground-fault monitoring, no phase-failure detection on this variant — those are separate order-code options in the 3VA2 family.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That width is the standard 3-pole MCCB footprint for the 3VA2 frame — it occupies three 35 mm DIN spaces if mounted on a DIN rail, or bolts directly to a backplate via the screw terminals. The depth of 86 mm leaves room for rear-connected busbars or cable ducts in a 200 mm deep enclosure.