What this MCCB carries and why it matters
The Siemens 3VA1063-4ED32-0DH0 is a 3-pole SENTRON molded case circuit breaker rated for 63 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. The 121 kA breaking capacity at 240 V means it can safely interrupt a fault current up to that level without welding contacts or cascading upstream — critical for high-fault panels near large transformers or utility feeds. At 415 V it still holds 75.6 kA, and at 690 V it drops to 11.9 kA, so the voltage-dependent curve governs where you place it in the distribution. The TM210 release is a fixed thermal and magnetic trip unit — no interchangeable rating plugs, so the 63 A frame is the breaker you get. The undervoltage release (UVR) built in lets a safety circuit or emergency-stop chain drop the breaker open when control voltage is lost, which is standard for machine-tool and conveyor infeeds where loss of control power should kill the load. Auxiliary contacts are 2 form-C plus a separate trip-alarm switch (HQ), so you get both status feedback (open/closed) and a dedicated fault signal — no need to add an external aux block for most panel-wiring schemes.
Thermal derating — the real-world current
The 63 A rating holds flat from 40 °C up to 50 °C. Above that it steps down: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If the panel ambient runs hot — say near a drive cabinet or in a non-climate-controlled enclosure — the actual continuous load must be capped at the derated figure, not the nameplate 63 A.
Mounting and integration notes
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a 3-pole frame — fits standard SENTRON panel cutouts and busbar systems. IP40 on the front means finger-safe from the front face, but the rear and sides are not sealed; mount inside a rated enclosure if washdown or dust is present.