What this MCCB is and what it does
The Siemens SENTRON 3VA1050-3ED32-0AE0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels and industrial switchgear. It carries a continuous current rating of 50 A up to 40 °C, derating to 45 A at 70 °C — the thermal curve matters when the breaker sits in a crowded, hot enclosure. Interrupting capacity is the headline: 75.6 kA at 240 VAC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That means it can safely clear a fault up to those levels without welding contacts or venting gas into the panel — critical for high-fault service entrances or downstream of large transformers. The TM210 release is a thermal-magnetic trip unit. Insulation voltage is rated 800 V.
Panel fit and environment
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard 3-pole MCCB footprint for DIN-rail or direct-mount panel integration. The 76.2 mm width (3 inches) matches typical SENTRON 3VA base frame spacing, so retrofitting into an existing 3VA panel layout should not require busbar rework. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. That covers most indoor industrial environments, including unheated warehouses. Power loss at full rated current is 14.6 W — negligible for thermal budgeting in a single breaker, but worth summing across a multi-breaker panel.