What this terminal does on a 3VA frame
The Siemens 3VA9374-0JD13 is a TC1.5 circular conductor terminal — a lug kit for terminating large-gauge copper on SENTRON 3VA5 and 3VA6 molded-case breakers. No control-wire tap on this version — it's a straight power lug for the line or load side of the breaker.
Where it fits in the panel
Sold as a 4-unit pack, these lugs bolt directly onto the 3VA5/6 400/600 breaker terminals — no adapter plate needed. The 600 kcmil top end covers parallel feeders or single large conductors; the 1 AWG floor lets you land smaller branch tails without a reducer.