What this MCCB is and what it does
The Siemens 3VM1163-4ED32-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection — the main disconnect or feeder breaker in a panel that takes the incoming power and splits it to downstream loads. It's a 3-pole unit rated 63 A continuous, with a TM210 thermal-magnetic trip unit that handles overloads (thermal) and short circuits (magnetic) in one package. The breaking capacity climbs to 121 kA at 240 V AC and still holds 76 kA at 415 V AC, 53 kA at 440 V AC, and 12 kA at 500 V AC — numbers that tell you it can live upstream of a high-fault transformer or a big motor control center without needing a current-limiting fuse ahead of it.
Thermal derating and real-world current
The 63 A rating holds solid from 40 °C right up to 50 °C — no derating needed in a warm panel. At 55 °C it drops to 62 A, at 60 °C to 61 A, at 65 °C to 60 A, and at 70 °C to 58 A. That's a gentle slope, so if your panel ambient runs 55 °C on a summer afternoon you still get 62 A continuous. The rated insulation voltage is 800 V, and the max operating voltage is 690 V AC or 500 V DC, which covers most 480/277 V and 600 V industrial systems in North America and 400 V in Europe.
Mounting and panel fit
It measures 130 mm high, 76.2 mm wide, and 70 mm deep — a compact three-pole footprint that fits standard MCCB mounting bases in a distribution panel. The front face carries an IP40 rating, meaning it's protected against tools and wires over 1 mm but not sealed against water; that's typical for indoor panel mounting. No trip indicator, no undervoltage release, no communication module — this is a basic thermal-magnetic breaker, not a smart or remotely-tripped unit. Power loss at rated current is 17 W, which matters for heat buildup in a dense panel.