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Door Contacts

Door contacts tell an alarm panel that a door, window or shutter has opened: a magnet on the moving part sits next to a reed switch on the frame, and parting them changes the circuit. This collection has wired surface, flush and recessed contacts, heavy-duty roller shutter and overhead door contacts, and wireless contacts for Ajax, Hikvision AX PRO, Pyronix Enforcer and Texecom Ricochet systems, with many graded to EN 50131.

Choosing Door Contacts

Choose by the door and by the alarm system: a wired contact needs a cable back to the panel, and a wireless one must speak the panel's radio.

Surface, flush and recessed contacts

Surface contacts screw to the frame and door, such as the CQR SC570/WH/MD/MULTI/G3, a Grade 3 dual-switch contact, and the Elmdene EN3-QSC-GN. Flush contacts sit in a drilled hole: the Elmdene EN3-QFC-GN is a 20mm Grade 3 contact potted with 1m of cable. For steel doors, the Aritech 1078-N is a 25mm recessed contact with a 13mm gap.

Shutters, overhead doors and gates

Roller shutter contacts are heavy-duty units, such as the CQR RS002/ALI/1M/G2/A and RS007/G3/AB/1M on 1 m armoured cable and the Knight F10CMULTI on a 1 m armoured lead. Elmdene's EN3-RSA-GN is a Grade 3 shutter contact with an 18mm operating gap. The Aritech DC115 is a sealed aluminium contact with 2 m armoured cable for metal and overhead doors, fences and gates.

Wireless contacts

Ajax DoorProtect Jeweller models join an Ajax hub by radio, Hikvision contacts such as the DS-PDMCS-EG2-WE(B) report to an AX PRO panel on 868 MHz, and the Pyronix MC1Z1-WE works with Enforcer. Outdoors, the Hikvision DS-PDMCX-E-WE and Pyronix MCEXTERNAL-WE are IP66 rated.

Resistors and wiring

Pre-resistored contacts save fitting resistors by hand: the Aritech DC148R4.7 has a built-in 4k7 EOL resistor, while the DMP HSS-L2D-000 has none built in. Check which values the panel expects before fitting.

TypeExamplesNote
SurfaceCQR SC525/WH/4C, Elmdene EN3-LSC-GNFixed to the face of frame and door
FlushElmdene EN3-QFC-GN, CQR FS610/WHFitted into a drilled hole
Recessed, steel doorsAritech 1078-N13mm gap
Roller shutterCQR RS007, Knight F10CMULTIArmoured lead
Overhead doors and gatesAritech DC1152 m armoured cable
Wireless, indoorAjax Superior DoorProtect, Pyronix MCNANO-WEBattery powered
Wireless, outdoorHikvision DS-PDMCX-E-WE, Pyronix MCEXTERNAL-WEIP66

Brands we stock in Door Contacts

Acre, Ajax, Aritech, CIE Group, CQR, Dahua Technology, Dantech Electronic Engineering, DMP, Eaton, Elmdene, Hikvision, Honeywell Home, Knight Fire & Security, Pyronix, Resideo, Texecom, Visonic and Voltek.

Knight Fire & Security, Aritech, CQR and Elmdene make most of the wired contacts on this page, and the wireless ones come from alarm makers such as Ajax, Pyronix and Hikvision.

Related categories

Pair contacts with a panel from our alarm panels, add movement detection from burglar alarm sensors, or see complete wireless alarm systems built around one radio family. See also Detector Brackets & Enclosures.

Frequently asked questions

What is a door alarm sensor?

A door alarm sensor, often called a door contact, tells an alarm panel when a door or window opens. It has two parts: a switch fitted to the frame and a magnet fitted to the door. Wired versions connect back to the panel by cable, while wireless ones pair with the panel by radio. The range here includes wired, wireless and roller shutter contacts.

How do door sensors work?

Many door sensors use a reed switch held in one position by a nearby magnet. When the door opens, the magnet moves away, the switch flips over and the alarm panel sees the zone as open. Some sensors add a shock or tilt detector to sense an attack on the door before it opens. The range here includes contacts with built-in shock and tilt detection.

How do you install a door sensor?

Fit the switch to the fixed frame and the magnet to the opening edge of the door, lined up and within the gap the maker allows. Flush contacts go into drilled holes, while surface contacts screw onto the face. Run the cable or pair the wireless unit with the panel, then test the zone with the door open and shut. The range here includes flush, surface and recessed contacts.

  • Established 1975
  • Birmingham trade counter
  • UK-only supply

Written by the West Midlands Electrics technical team

Updated

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