The Siemens 3VA9503-0JG23 is an active-production SENTRON TA3.1 circular conductor terminal voltage tap, sold as a set of three units. It's the accessory that brings a control-wire tap-off to the main lugs on 3VA15 and 3VA25 1000 A frame breakers — you land the phase conductors on the busbar side and pick off a smaller wire for the shunt trip, undervoltage release, or auxiliary power supply without an extra terminal block.
Panel integration
This is a lug-body accessory, not a DIN-rail component — it bolts directly to the breaker line-side or load-side studs inside the panel. The three-unit pack covers a 3-pole breaker. Because it adds height above the breaker terminals, verify enclosure depth clearance before wiring; the voltage tap wire exits through a secondary compression port in the lug body.
Lifecycle status is active — Siemens lists this order code as current production. No successor or replacement has been issued.