What this MCCB carries and what it means for your panel
The Siemens 3VA2063-5JQ32-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated 63 A full-scale, 3-pole, designed for line protection. Its interrupting capacity hits 187 kA at 240 V — enough to clear a high-fault utility transformer secondary without upstream coordination headaches. At 415 V and 440 V it still holds 121 kA, dropping to 75.6 kA at 500 V and 3 kA at 690 V. That 187 kA at 240 V tells you this breaker is sized for the main or a heavy feeder, not a branch circuit. The 63 A rating holds flat across the entire operating temperature range from 40 °C through 70 °C — no derating needed in a warm enclosure.
Panel fit — dimensions and integration
At 105 mm wide, 181 mm tall, and 86 mm deep, this MCCB fits a standard Siemens SENTRON 3VA mounting footprint. The 86 mm depth (3.39 in) means it clears most 200 mm-deep enclosures with room for rear busbars or a gland plate. Two auxiliary switches plus one trip alarm switch (HP type) are built in — no separate add-on block needed for status feedback to a PLC or safety relay. No undervoltage release, no voltage trigger; the protection logic is all internal to the electronic trip unit.
Coordination and selectivity notes
The minimum short-circuit breaking capacity across the voltage range is 3 kA at 690 V — that's the weak point for selectivity studies. Below 500 V the 75.6 kA to 187 kA range gives plenty of headroom for a cascaded trip scheme. The 63 A full-scale rating with a 16 A initial value suggests an electronic trip unit with adjustable long-time pickup. Maximum power loss is 5.4 W — negligible for thermal budgeting in a sealed panel, but worth noting if you're packing six of these side-by-side.