The Siemens SENTRON 3VA9673-0JC34 is a TA4.2 circular conductor terminal with an integrated control wire voltage tap, designed for three-cable termination on 3VA55, 3VA65, and 3VA66 molded-case circuit breakers. It accepts stranded copper or aluminum conductors from 500 kcmil up to 750 kcmil, with a stripped length range of 1.1 to 2.3 inches. The terminal torque spec is 42.4 Nm for both 240-300 mm² stranded and 240 mm² finely stranded copper.
The 500-750 kcmil range covers large feeder conductors typical of main breaker line-side connections in industrial switchboards. The 42.4 Nm torque spec is a high-value termination — you'll need a calibrated torque wrench, not a standard screwdriver, to land these lugs. The stripped length window (1.1/1.7/2.3 in) gives you flexibility to match the terminal lug depth, but the longest strip is for the largest cable gauge. The control wire voltage tap is the key differentiator here: it lets you pick off line-side voltage for a control transformer or metering without adding a separate tap block. That saves a DIN-rail slot and a wiring step in the panel.