The Siemens 3VA9254-0JA12 is a SENTRON box terminal set — four TS1.3 terminals designed for the 3VA1 250 molded-case breaker family. It handles stranded copper from 50 mm² up to 185 mm² (or 4 AWG to 350 kcmil), torqued to 14 Nm. The stripped length is 0.8 in. This is the terminal block you bolt onto the breaker line and load side when you're running larger cable — no control wire tap on this version.
What the conductor range means for your panel
The 50–185 mm² stranded range (350 kcmil max) covers heavy feeder cables. Finely stranded tops out at 150 mm², same 14 Nm torque. The 0.8 in strip length avoids exposed conductor past the terminal.