What this breaker is and what the ratings mean for fit
The Siemens 3VA4190-5ED14-3AA0 is a 1-pole UL Frame 125 molded-case circuit breaker with a 35 kA interrupting capacity at 277 VAC, per the datasheet. That interrupting rating places it in the M (medium) breaking capacity class — sufficient for most panelboard and lighting-panel fault levels where the available fault current stays under 35 kA line-to-neutral. The thermal-magnetic trip unit is a fixed TM210: overload protection (Ir) is permanently set at 90 A, and the instantaneous short-circuit pickup (Ii) is fixed at 10 times In, or 900 A. No field-adjustable dials on the thermal or magnetic settings — what you order is what you get, which simplifies spec review but means the breaker is sized to the load, not tuned around it. The 3VA4 frame itself is a compact, 1-pole footprint designed for UL 489 branch-circuit protection. It mounts directly into a standard panelboard or enclosure bus; the line and load lugs accept copper or aluminum conductors per the manufacturer's torque schedule. Because the product class is C — manufactured or produced to order — this is not a shelf-stocked item. Expect it to be built against your order, which means confirmed lead time at quote and no standard return privilege.