What this MCCB does for a motor circuit
The Siemens 3VA2163-5MN36-0AG0 is a 3-pole molded case circuit breaker from the SENTRON family, rated 63 A continuous current at 40 °C and built for motor protection with an ETU350M electronic trip unit that includes phase failure detection. The interrupting ratings climb to 187 kA at 240 V AC, 121 kA at 415 V, and 121 kA at 440 V, then drop to 75.6 kA at 500 V and 17 kA at 690 V — so on a 480 V panel this breaker clears faults well above typical available fault currents without cascading upstream. The 800 V rated insulation voltage (Ui) gives headroom for systems where line-to-line voltage sits below that ceiling. It ships with one auxiliary switch and one trip alarm switch (HP type), plus a mechanical endurance of 20 000 operations. The front face carries IP40 protection — fine for a clean indoor panel; keep the enclosure door closed against washdown. Maximum power loss is 75 W, so factor that into the panel's thermal budget if you're packing several breakers in a row.
Thermal derating and panel fit
The 63 A rating holds flat from 40 °C through 50 °C, then derates to 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your enclosure runs hot near the top of that range, you lose about 10 % of the continuous current — size the breaker for the actual ambient, not the nameplate. The case dimensions are 105 mm wide, 181 mm tall, and 86 mm deep; that depth is the body only, not counting the handle throw. Mounts on a standard DIN rail or direct panel-mount plate; wire it up with the lug kit that matches your cable size.