What this MCCB carries — and what it doesn't
The Siemens SENTRON 3VA1063-4ED32-0AC0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current (Iu) with a TM210 thermal-magnetic release — fixed thermal, fixed magnetic, no electronic adjustment. It's a line-protection breaker, not a motor-protection or ground-fault device; no undervoltage release, no phase-failure detection, no communication module on board. The 121 kA breaking capacity at 240 V AC is the headline number, but the 75.6 kA at 415 V and 52.5 kA at 440 V are the real-world figures for most industrial panels — that still puts it well above typical available fault current in a 400 V distribution board, so selectivity coordination is straightforward. The auxiliary contact block is already fitted: 2 HQ (high-utilization) auxiliary switches, which means you get two form-C contacts wired and ready for status feedback to a PLC or indication lamp. No need to order a separate aux block for basic signaling.
Thermal derating — the real current rating at panel temperature
Rated 63 A from 40 °C 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 the panel ambient runs hot — say a sealed enclosure near a furnace line — that 63 A breaker is effectively a 57 A device. Plan the load accordingly.
Panel fit — dimensions and mounting
Width 76.2 mm, depth 70 mm, height 130 mm. That's a standard 3-pole MCCB footprint — it drops into the same DIN-rail or screw-mount cutout as other SENTRON 3VA frame breakers. The IP40 front protection means it's fine inside a closed panel; not rated for washdown or outdoor exposure.