The Siemens 3VA1050-3ED42-0AD0 is a SENTRON 4-pole molded case circuit breaker rated for 50 A continuous current (Iu) at 40 °C, with a TM210 thermal-magnetic trip unit — fixed thermal, fixed magnetic, no electronic adjustment. Interrupting capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. This is a straight line-protection breaker for a panel that needs a fixed-trip 50 A feed.
The 50 A rating holds flat from 40 °C to 50 °C, then steps down: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, 45 A at 70 °C. Ambient inside the enclosure matters — if the panel runs hot, you lose 5 A by 70 °C. Dimensions are 130 mm tall, 101.6 mm wide, 70 mm deep. No N-conductor protection on this variant.