What this MCCB does — and what the ratings mean for fit
The Siemens 3VA2063-5JQ32-0CA0 is a SENTRON molded case circuit breaker rated for 63 A continuous current from 40 °C to 70 °C. Three-pole construction, so it switches all phases simultaneously. The breaking capacity climbs to 187 kA at 240 V AC, drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V means it can interrupt a fault current up to 187,000 amps on a 240 V line without failing — critical for high-fault installations like large transformer secondaries or industrial mains. The part is configured for line protection — the standard role for a mains or feeder breaker — and includes an undervoltage release (UVR) that trips the breaker when supply voltage drops below a set threshold. That UVR is useful for preventing automatic restart after a brownout or for coordinated undervoltage protection in a motor control center. A ground-fault monitoring function is built in, using summation current formation on the L-conductor. That means it measures the vector sum of phase currents to detect leakage to ground — a common requirement for personnel protection or equipment protection in grounded systems.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for the SENTRON 3VA2 frame — it occupies three 35 mm DIN module positions (at roughly 35 mm per pole) plus a small margin. The 86 mm depth is shallow enough to clear most 200 mm deep enclosures, but verify clearance for the UVR wiring and any communication module that plugs into the front face. The unit is designed for DIN-rail mounting in a distribution panel or motor control center. The communication function suggests it can integrate with a bus system for remote monitoring or trip indication — check the specific protocol (PROFIBUS, PROFINET, or Modbus) against your control network before ordering.
What compliance documentation comes with it
As a Siemens SENTRON product, this MCCB carries CE marking for the European market and is designed to meet IEC 60947-2 for molded case circuit breakers. UL and CSA listings are typical for the 3VA2 series, but verify the specific UL file number against your local code requirement — some variants carry UL 489, others UL 1066 depending on the rating. RoHS and REACH declarations are available from Siemens on request.