What this MCCB does on the line
The Siemens 3VA1050-3ED32-0AH0 is a 3-pole SENTRON molded case circuit breaker rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. It's built for line protection — meaning it sits upstream of a feeder or a distribution panel, not on a motor branch circuit that needs separate overloads. The interrupting capacity hits 75.6 kA at 240 V and still delivers 52.5 kA at 415 V, so it can handle high-fault utility feeds without cascading upstream. The 2 auxiliary switches plus a dedicated trip alarm switch (HQ) let the PLC or SCADA know exactly when it's tripped and why — no guessing from a remote panel.
Thermal derating — what 50 A actually means at panel ambient
This breaker holds its full 50 A rating from 40 °C up to 50 °C. At 55 °C it derates to 48 A, at 60 °C to 47 A, and at 70 °C to 45 A. If the panel runs hot — say near a drive cabinet or a transformer — the continuous load must be capped at the derated figure, not the nameplate 50 A. The TM210 release has an adjustable time delay (tr max 1 s), so it can be tuned to ride through inrush without nuisance tripping.
Mounting and integration
The 3VA1050-3ED32-0AH0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard MCCB footprint that drops into most SENTRON distribution blocks and panelboards. It's a fixed (non-plug-in) breaker, so install it with busbar or cable lugs. Front IP40 protection means it's fine inside a closed panel but not for washdown areas. No communication module, no undervoltage release, no ground-fault monitoring — this is a straightforward thermal-magnetic breaker with aux contacts for status feedback.