The Siemens 3VA9133-0JJ12 is a SENTRON TA2.1 circular conductor terminal — a wire connector accessory, sold in a pack of three, designed for the 3VA4/5 125 molded-case breaker family.
The 1.2 in strip length means you're not guessing how much insulation to remove — mark the cable, strip, and land it. No control-wire tap on this terminal, so it's a straight power connection. Mounts directly on the 3VA4/5 125 breaker's line or load side — no adapter plate needed. The three-unit pack covers a three-pole breaker in one shot.
Active and current — no EOL notice, no NRND flag. Available through standard Siemens distribution channels.