The Siemens 3VA9673-0JJ44 is a SENTRON TA4.4 circular conductor terminal — a wire connector accessory for the 3VA55, 3VA65, and 3VA66 molded-case circuit breaker frames. Each pack ships three units, each terminating up to four cables. Stranded copper or aluminum cable from 4/0 AWG up to 600 kcmil is torqued to 42.4 Nm on the main conductor pad; finely stranded copper (120–185 mm²) also lands at the same torque. Stripped length is 0.9 to 1.75 inches.
What the torque spec means on the panel floor
42.4 Nm (roughly 375 in-lb) is a high-torque termination — expect to use a torque wrench with a hex socket, not a standard screwdriver. That clamping force is what keeps 600 kcmil terminations stable under fault-current thermal cycling. The terminal accepts four cables, so it's sized for paralleled feeds or multiple downstream loads in a single breaker lug well.