What this 3VA frame carries
The Siemens SENTRON 3VA4150-6ED34-1AA0 is a 3-pole molded-case circuit breaker rated 50 A continuous at 40 °C through 50 °C, with the TM210 thermal-magnetic release. Instantaneous pickup is fixed at 500 A (10× In), so it clears bolted faults fast but won't nuisance-trip on motor inrush on a properly sized feeder. It's meant for distribution panel main or feeder duty — not for direct motor switching. The TM210 release gives you thermal adjustment via a dial on the front, but the magnetic is non-adjustable at 500 A.
Above that it steps down: 49 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, 44 A at 70 °C. If your panel internal ambient runs hot — say next to a drive or transformer — size the breaker for the derated number, not the nameplate 50 A.
Footprint is 76.2 mm wide × 129.4 mm tall × 75.1 mm deep — a standard 3-inch wide MCCB form factor. It mounts to a DIN rail or panel via the rear slots. Power loss runs 9.7 W max at rated load — negligible for thermal panel design unless you're packing a dozen of these in a small enclosure.