1: Is there a compatible override switch with this unit or is strictly a closed loop sensor with 0-10v daylight set back?
No compatible wall override switch is listed for the WEC-2CPDR-3.
This unit is a 120–277V PIR ceiling sensor with 0–10V bi-level dimming/daylight control, adjustable by DIP switch or the optional WEC-3RC remote control. It is intended to control the load through the sensor and 0–10V dimming circuit, not through a separate override switch.