Sensors & Transducers

Microwave presence detector switches

October 2012 Sensors & Transducers

The latest MWS1A series of microwave presence detector switches from CP Electronics is designed to provide automatic control of lighting, heating or ventilation loads. Movement is detected using a highly sensitive microwave detector. This works by emitting low power microwave signals and measuring the reflections as the signals bounce off moving objects. The MWS1A is optimised for wall mounting applications to give detection over long distances.

When movement is detected, the load is turned on. When an area is no longer occupied, the load switches off after an adjustable time-out period. The internal light sensor provides additional energy saving in lighting applications. When an area is occupied, lighting is only switched on when the level of natural light is below a preset level.

Three variants are available: MWS1A-PRM with mains voltage, switched live contact; MWS1A-PRM-VFC with mains voltage, isolated changeover contact; and MWS1A-PRM-LV with low voltage, isolated changeover contact.

The series has the lowest standby power consumption of any microwave detector on the market today. Delivering presence and absence control, the MWS1A allows configuration via an easy to operate, infrared handset. Its unique design allows override/activation by a simple hand motion in front of the unit that does not require any actual contact with the unit if the system is in absence mode and lighting is required.

For more information contact Chris Huxham, Shorrock Automation, +27 (0)12 345 4449,,


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