What this MCCB is and where it fits
The Siemens 3VA1063-4ED32-0CC0 is a SENTRON molded case circuit breaker (MCCB) for line protection in distribution panels. It carries a rated continuous current Iu of 63 A across three poles, with a TM210 thermal-magnetic overcurrent release — that's the fixed-trip version, so the 63 A frame is the breaker you spec, not an adjustable one. The 121 kA breaking capacity at 240 V (75.6 kA at 415 V, 52.5 kA at 440 V, 11.9 kA at 690 V) tells you it handles high-fault-current scenarios like transformer secondaries or large motor branch circuits without needing a current-limiting fuse upstream. The 3VA1063-4ED32-0CC0 includes an undervoltage release (UVR) as the auxiliary release design, plus two auxiliary switches HQ. That UVR means the breaker trips if control voltage drops below a threshold — useful for safety circuits where a loss of control power should open the feeder. The auxiliary switches give you status feedback to a PLC or indicator lamp without adding external relays.
Thermal derating and panel integration
The 3VA1063-4ED32-0CC0 holds its full 63 A rating from 40 °C up through 50 °C ambient. At 55 °C it derates to 60.48 A, at 60 °C to 59.22 A, at 65 °C to 57.96 A, and at 70 °C to 56.7 A. If your panel runs warm — say next to a drive cabinet — check the ambient at the breaker location, not the room thermostat. The IP40 front protection means it's fine for a clean indoor panel; no washdown rating here. Dimensions are 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard MCCB footprint that fits most DIN-rail or mounting-plate layouts. The 3-pole design with no voltage trigger or communication function keeps it a straightforward line-protection device. The 15 000 latching endurance cycles cover typical panel switching for maintenance or load shedding.