What this MCCB is and what it does
The Siemens 3VA1063-4ED42-0AE0 is a SENTRON 4-pole molded case circuit breaker (MCCB) designed for line protection — the primary job is guarding feeders and downstream distribution against overcurrent and short-circuit faults in a panel. Rated 63 A at 40 °C with a TM210 thermal-magnetic release, it holds its full current rating up to 50 °C and only begins derating above that: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, 58 A at 70 °C. That means in a warm enclosure you still get nearly the full ampacity without jumping frame sizes. Breaking capacity is the number that decides whether this breaker clears a fault without exploding or upstream devices having to trip. At 240 V it interrupts 121 kA; at 415 V it handles 75.6 kA; at 440 V, 52.5 kA; at 500 V and 690 V, 11.9 kA. Those are high-interrupting ratings — this breaker is sized for high-fault installations, not light commercial. Rated insulation voltage is 800 V, so it's rated for 690 V systems with margin.
Physical fit and panel integration
Panel space is tight, so the dimensions matter: width 101.6 mm, height 130 mm, depth 70 mm. Four poles in that width means each pole takes about 25.4 mm — standard for a 4-pole MCCB in this frame. Mounts on a DIN rail or directly to a backplate; no communication module, no undervoltage release, no ground-fault monitoring on this variant — it's a straight line-protection breaker. Auxiliary switch provision is listed as 4 auxiliary switches HQ, meaning the switching accessory slot is populated, but the breaker itself carries no trip indicator or voltage trigger.