The Siemens 3VA2563-5MN32-0DL0 is a 3-pole IEC frame 1000 molded case circuit breaker (MCCB) rated at 630 A continuous, with a 55 kA breaking capacity at 415 V (class M). It is fitted with an ETU350M electronic trip unit configured for LSI protection — long-time (Ir adjustable 250–630 A), short-time (Isd adjustable 3–15 × Ir), and instantaneous (Ii fixed at 15 × In). The unit is designed for motor protection duty, meaning the trip curves are shaped to coordinate with motor inrush and thermal limits.
For selectivity studies, the class M rating (typically 55 kA at 415 V) places it in the middle tier of the 3VA2 family; you coordinate downstream with lower-rated breakers and upstream with a higher-rated main. The 630 A frame with Ir down to 250 A gives flexibility: you can protect a 250 A motor feeder without changing the breaker frame, just dial the Ir setting. The 'M' suffix indicates motor protection — the long-time delay is shaped to ride through motor starting without nuisance tripping, while the short-time and instantaneous settings clear faults fast. The Ir range of 250–630 A covers a wide band of motor FLA ratings; set Ir to 1.0 × motor FLA per NEC 430.32.
Accessories and integration
The nut keeper kit is also included — a panel detail often overlooked: it secures the breaker mounting nuts in the enclosure, preventing them from dropping behind the panel during installation. This is typical for emergency-stop circuits or to prevent automatic restart after a power dip.