The Siemens 3VA9574-0JB23 is a SENTRON TA3.1 circular conductor terminal — a voltage tap designed for internal use on 3VA55, 3VA65, and 3VA66 molded-case circuit breakers. It accepts two cables per terminal, supplied as a 3-unit pack. The wire range covers 4/0 AWG to 600 kcmil for both copper and aluminum stranded conductors, and 4/0 AWG to 600 kcmil for finely stranded copper. The stripped length is 1.0 in, and the terminal torque is 42.4 Nm for the 120-300 mm² / 120-185 mm² ranges.
Mounts directly on the line-side or load-side lugs of the compatible 3VA breaker frame. No DIN-rail footprint — this is a lug-landing terminal, not a snap-on accessory. The 42.4 Nm torque spec means a calibrated torque wrench is required for termination; hand-tightening will not reach the listed value. The terminal does not include a control wire tap — it is a power conductor connection only. Use separate control wiring for auxiliary or shunt-trip circuits.