Compact Recessed NC Window Sensor

A space-efficient, wired magnetic contact sensor with normally closed (NC) functionality, tailored for flush mounting in narrow window stiles and slim-profile door frames. Measures just 22 mm in length, 10 mm wide and 5 mm thick — one of the smallest recessed NC sensors validated for UK domestic alarm use. Weighs only 8 g and uses corrosion-resistant internal contacts to ensure longevity in humid environments such as bathrooms or conservatories. Compatible with all major UK alarm brands via standard dry-contact interface; installs using two M2.5 screws and terminates with captive screw terminals for secure, vibration-resistant connections.