Ceiling surface-mounted PIR absence switch

CESR PIR Ceiling surface-mounted PIR occupancy switch

Ceiling surface-mounted PIR absence switch.

When someone enters a room the lights are turned on using a wall switch. When the occupant leaves the room or area of detection the CESRA PIR automatically switches the lights off after a pre-selected time.

The override OFF function allows the occupant to turn the lights off from the wall switch (while the CESRA PIR is in the ON state) without waiting for the pre-selected time lag to time out. The lights can be switched back ON by operating the wall switch in the usual way.

Product code: CESRA PIR

Download Installation Guide



Ideal for meeting rooms, offices, corridors, student and military accommodation, classrooms etc.

Can be mounted directly onto solid ceilings or onto a range of different mounting boxes.




Detection Zone: 360°
Time lag range: 10 seconds to 40 minutes in 9 steps
Photocell range: 30 to 1000 lux, and inactive
Loading: Up to 6 amps (1500W) of resistive loads.
Up to 6 amps (1500W) of fluorescent loads.
Up to 3 amps (750W) of electronic and wire wound transformer loads.
Up to 2 amps (500W) of CFL, 2D lamps, LED Drivers and LED lamps and fittings.
Up to 1 amp (250W) of fans.
Dimensions: 91 x 91 x 45 mm



  • DimensionsOpen or Close
    Dimensions: 91 x 91 x 45 mm cesr-pir-dimensions
  • Detection DiagramsOpen or Close

    icn-detection-strongStrong detection zone
    ie. person moving arm

    icn-detection-secondarySecondary detection zone
    ie. person walking (less sensitive when walking straight towards PIR switch)

    For optimum coverage recommended mounting height between 2.4 and 5m.

    PIR Quad detector gives 124 detection areas within the zone


    Perspective view of detection zone

    For optimum coverage recommended mounting height between 2.4 and 5m


    Several PIR occupancy switches


    In open plan areas

    For best coverage the PIR occupancy switches should be spaced every 5m in either direction

  • Wiring DiagramsOpen or Close
    Single CESRA PIR wd15a
    A few CESRA PIR wired in parallel wd15b