What this 50 A MCCB does on the line
The Siemens 3VA1050-2ED36-0DC0 is a 3-pole SENTRON molded case circuit breaker rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic release that handles overload and short-circuit protection in a single unit. It carries 52.5 kA interrupting capacity at 240 V and 32 kA at 415 V, so it clears high-fault bolted shorts without the breaker welding shut — critical for panel SCCR coordination downstream of a transformer or large motor branch. The 70 mm depth and 76.2 mm width fit standard MCCB panel cutouts; the 130 mm height leaves room for the undervoltage release module and auxiliary wiring. Rated insulation voltage is 800 V, so it's suitable for 480 V and 600 V class systems with margin.
Thermal derating and real-world current
The 50 A rating holds flat from 40 °C to 50 °C. Above that, it derates linearly: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the panel ambient hits 60 °C, plan for a 47 A continuous load max — the breaker won't nuisance-trip on a 50 A load at that temp, but the TM element will track the thermal curve.
Interrupting ratings across voltages
Interrupting capacity drops as voltage rises: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. For a 480 V panel with 25 kA available fault current, this breaker covers it with headroom. At 690 V, keep the available fault below 7.5 kA or step up to a higher-interrupt frame.
Auxiliary and release configuration
Comes with two HQ (high-qualified) auxiliary switches and an undervoltage release (UVR) built in. The UVR trips the breaker when control voltage drops below dropout threshold — standard for emergency-stop circuits or undervoltage protection on motor feeders. No ground-fault monitoring or communication module on this variant; those are separate order-code options.