What it is and where it lands
The Siemens 3VA9403-0JC23 is a SENTRON TA2.4 circular conductor terminal — a wire connector designed to terminate two copper or aluminum cables into a single compression point on 3VA1 and 3VA2 molded-case circuit breakers in the 400 A and 630 A frame sizes. It is an accessory, not a standalone device; it mounts on the breaker's line or load side to consolidate parallel feeds. A built-in control wire voltage tap-off lets you pick off a lower-gauge sense or control voltage directly at the breaker terminal, eliminating a separate tap block on the bus. Stripped length is 1.2 in for the main conductor and 2.3 in for the tap, so the wire prep is straightforward — strip, insert, torque.
Lifecycle and sourcing
The 3VA9403-0JC23 carries an active lifecycle status. It is a current-production SENTRON accessory, not a phase-out or NRND line. For a BOM line that calls out this order code, the supply posture is straightforward: quoted to order against an RFQ through independent distribution, with availability and current pricing confirmed at quote time.
Cable range and what it means for fit
The 600 kcmil maximum on both copper and aluminum means this connector handles the full ampacity of a 400 A or 630 A breaker without needing a reducer or a second lug. The 2/0 AWG minimum covers the smaller parallel feeds often used in tap-off or subfeed configurations. If your wire size falls outside that range — say, 750 kcmil or 1/0 AWG — this terminal won't grip properly.