The Siemens 3VA9144-0JB11 is a SENTRON TA1.3 wire connector, supplied as a pack of four units, designed as an accessory for the 3VA6 150/250 molded-case circuit breaker family. It accepts copper or aluminum conductors in solid, stranded, and finely stranded constructions, covering 14 AWG through 1/0 AWG — the range you'd typically see on the line and load side of a 150–250 A frame breaker.
Torque specs — what they mean on the panel floor
Stripped length is 0.7 in (roughly 18 mm), which matches standard ferrule and crimp tooling. No need to re-trim if you're coming off a prepped cable assembly.