For the Series 300 manual transfer switches with the phase rotation monitor accessory 170*P*, the phase rotation reference (ABC or CBA) is selected by adjusting the jumper position on the customer terminal block TB; the default selection from the factory is ABC. Consult the correct wiring diagram as the terminal assignments may change from unit to unit.

When the phase rotation of the source being pointed to by the selector switch matches the phase rotation reference set by the jumper position above, the corresponding green light for PHASE ROTATION OK will illuminate.



Please reach out to ASCO Technical Support at techinicalsupport@ascopower.com or at 1.800.800.ASCO (2726) to request the correct wiring diagrams.

Published for:ASCO Power Technologies USA