What this accessory does in the panel
The SENTRON 3VA9234-0JG12 is a wire connector TA1.4 designed as an accessory for the 3VA5 250 molded-case circuit breaker family. It accepts copper or aluminum conductors from 6 AWG stranded up to 350 kcmil (16–185 mm² IEC), with a wire stripping length of 0.8 in. The built-in control wire voltage tap-off lets you pick up control power directly at the breaker line side — no separate tap block needed, which saves a DIN-rail position in a crowded enclosure.
Terminal markings and conductor range
UL marking on the terminals reads TA1.4 CMC 6-350 CU7AL UR CSA; IEC marking reads 16-185 mm² CU/AL NNL. The connector handles solid aluminum up to 16 mm², stranded copper and aluminum from 6 AWG to 350 kcmil, and finely stranded copper over the same range. That covers most panel feeder and branch-circuit conductor sizes you'd land on a 250 A frame breaker.