Control wire tap-off — one less splice in the panel
The 3VA9373-0JK13: The TC1.5 terminal includes a control wire voltage tap-off. That means a smaller-gauge control wire can be terminated at the same lug position to pick off line voltage for an auxiliary circuit — shunt trip, undervoltage release, or indicator light. It eliminates a separate tap splice or split-bolt connector inside the enclosure. Confirm the tap-off wire gauge and insulation rating match your control circuit; the evidence does not list the tap-off wire range.