What this MCCB is and what the ratings mean for fit
The Siemens SENTRON 3VA2163-5JQ32-0AD0 is a 3-pole molded case circuit breaker rated for line protection, with a continuous current of 63 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. That 63 A holds flat from 40 °C through 70 °C, so you can mount it in a warm cabinet without recalculating the load. Interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA at 240 V covers high-fault utility feeds; the 121 kA at 415 V handles most industrial distribution. The 3.7 kA at 690 V is a reminder that this breaker is sized for low-voltage mains, not 690 V motor circuits. It carries a communication function (Ethernet or fieldbus via the SENTRON communication module), three auxiliary switches HQ, and a ground-fault monitoring version using summation current formation on the L-conductor. The auxiliary switches report breaker status back to the PLC — useful for remote fault annunciation.
Panel fit and integration
Dimensions are 86 mm deep, 105 mm wide, 181 mm high. That 105 mm width is a standard 3-pole MCCB footprint — it fits the same DIN-rail or screw-mount pattern as other SENTRON 3VA frames. The 86 mm depth leaves clearance for rear-connected busbars or cable lugs in a typical 200 mm deep enclosure. Power loss is 4 W maximum, so heat dissipation inside the panel is minimal — no forced cooling required for a single unit. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses.