What it is and what it carries
The Siemens 3VA1050-3ED42-0AF0 is a 4-pole SENTRON molded case circuit breaker (MCCB) sized for line protection. It's rated for 50 A continuous at ambient temperatures up to 50 °C. The TM210 thermal-magnetic release handles overload and short-circuit protection. Breaking capacity hits 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V — enough for most industrial service-entrance or distribution panels. At 690 V it still interrupts 7.5 kA, which covers motor branch circuits on 600 V class systems.
Mounting and panel fit
The breaker measures 101.6 mm wide, 130 mm tall, and 70 mm deep. That's about a 4-inch wide footprint on the DIN rail or mounting plate. Rated insulation voltage is 800 V. Maximum power loss is 14.6 W.