What it is and what it does
The Siemens SENTRON 3VM1463-4GE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 630 A continuous, with a TM220 thermal-magnetic overcurrent release. It's designed for line protection — the main feed into a panel, not branch circuits. The 630 A rating holds flat from 40 °C up through 50 °C; above that it derates gradually to 583 A at 70 °C, which matters if this breaker lives in a hot enclosure near transformers or drives. Breaking capacity is the headline here: 121 kA at 240 V, 76 kA at both 415 V and 440 V, and 53 kA at 500 V. That's serious fault-interruption capability — enough for high-fault utility feeds or large transformer secondaries without cascading upstream breakers. Rated insulation voltage is 800 V, so it can sit on a 690 V system with margin.
Fit and integration
Physical envelope: 110 mm deep, 184 mm wide, 248 mm tall. That's a standard 4-pole MCCB footprint — bolts into a panel on the mounting plate, not a DIN rail. IP40 on the front keeps tools and fingers out; no IP rating on the body sides, so clearance to live busbars inside the enclosure is on you. No undervoltage release, no shunt trip, no ground-fault monitoring, no communication function. This is a straight thermal-magnetic breaker — wire it, torque the lugs, and it protects. The N-conductor is protected at 100% (full-rated), so it's suitable for 4-wire systems where the neutral carries load current.