The Siemens SENTRON 3VA9673-0JC43 is a TA4.3 circular conductor terminal voltage tap — a wire connector designed for four cables, with an integrated control wire voltage tap-off. It ships as a set of three units, intended as an accessory for the 3VA55, 3VA65, and 3VA66 molded-case circuit breaker frames. Per the datasheet, the terminal accepts copper or aluminum stranded conductors from 4/0 AWG up to 500 kcmil (120–240 mm²), with a specified tightening torque of 36.7 Nm. Finely stranded copper conductors also fall within the same 4/0–500 kcmil range. The control wire tap allows a smaller-gauge sense or control wire to be connected at the same lug point, eliminating the need for a separate tap block on the line side of the breaker — a clean integration detail for panel builders wiring metering or shunt-trip circuits.
Integration note
This terminal mounts externally on the line-side lugs of the compatible 3VA breaker frames. The stripped length per conductor is specified at 0.9 / 1.75 in — a detail worth confirming against your lug-landing dimensions before terminating. The 36.7 Nm torque is a firm value; a calibrated torque wrench is expected for installation.