What this MCCB carries — and what it means for your panel
The Siemens 3VA2163-5MN32-0AE0 is a 3-pole SENTRON molded case circuit breaker rated 63 A continuous current at 40 °C, with a rated insulation voltage of 800 V. It's the motor protection variant, meaning the ETU350M electronic trip unit is programmed for the thermal and magnetic curves a motor load draws — not a straight feeder breaker. The 187 kA breaking capacity at 240 V tells you this thing will clear a bolted fault on a large distribution transformer without the arc climbing into the buswork. Out here in the grease, that's the difference between a breaker that trips clean and one that welds shut.
Breaking capacity across voltages — where it holds and where it drops
At 415 V and 440 V it still delivers 121 kA; at 500 V it drops to 75.6 kA; at 690 V it's 17 kA. That 690 V number is the one to watch if you're on a 690 V mining or marine distribution — 17 kA is adequate for a downstream MCC but not a main. The 63 A rating holds flat from 40 °C to 50 °C, then derates to 60.48 A at 55 °C and 56.7 A at 70 °C. Mount it in a warm corner of the panel and you lose headroom; keep the ambient below 50 °C to get the full 63 A.
Physical fit and panel integration
The 3VA2163-5MN32-0AE0 measures 105 mm wide by 181 mm tall by 86 mm deep. That 105 mm width is the standard SENTRON 3-pole MCCB footprint — it drops into the same DIN-rail or screw-mount slot as other 3VA frame sizes. The 86 mm depth includes the arc chamber and the ETU; make sure your gland plate or deadfront has clearance for the full 86 mm, especially if you're back-paneling with a shallow enclosure.
What the ETU350M release and aux contacts buy you
The ETU350M is an electronic trip unit with phase failure detection built in — it catches a lost phase on a motor circuit and trips before single-phasing cooks the winding. The breaker also carries four high-quality auxiliary switches (HQ version) for status feedback to a PLC or annunciator. Maximum power loss is 75 W, so factor that into your panel thermal budget if you're stacking several breakers in a sealed enclosure.
Storage and operating temperature range
Operating temperature spans -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit is wider because the breaker isn't carrying current — that's the handling and warehousing spec, not the running limit. If the breaker sits in an unheated warehouse in winter, -40 °C storage is fine; just let it warm up to above -25 °C before energizing.