The Siemens 3VA9133-0JA11 is a SENTRON box terminal, designation TS1.1, sold as a 3-unit pack. It is an accessory for 3VA4 and 3VA5 molded-case circuit breakers in the 125 A frame. This is the terminal you reach for when landing copper cable on a 3VA4 or 3VA5 breaker — it replaces the standard line/load lugs with a box-style connection that gives you more room for larger conductors and a cleaner torque path.
Because it is an active accessory for a widely installed breaker family (3VA4/5), availability through independent distribution is generally steady.
The box terminal mounts directly onto the breaker's line or load side connection points — no adapter bracket, no DIN-rail footprint change. The 3-unit pack covers a 3-pole breaker in one shot. No control wire tap on this terminal, so it is a straight power connection only. If you need auxiliary signal takeoff, you will add a separate tap block on the outgoing cable.