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Three small white cylindrical sensors with magnets, recessed mount design, plastic housing, 23cm cables

Unique-Bargains

Unique-Bargains 3pcs Recessed Magnetic Door Window Sensor White

SKU CH-Q4K8-30JM8

Three recessed magnetic sensors with 23 cm leads, 15 mm actuation and 100 V / 10 W rating for door or window alarm circuits

  • Product typeHome Automation - Sensor & Accessories
  • Recessed design keeps sensors hidden in frames
  • 15 mm actuation gap suits tight clearances
  • 23 cm cable simplifies wiring runs
  • Normal-open reed switch triggers alarm on opening
  • Double-sided tape enables tool-free mounting

Three-Pack Recessed Magnetic Sensors

This three-pack of recessed magnetic sensors provides discrete door and window monitoring for alarm systems. Each unit uses a normally open reed switch that closes the circuit when the magnet is within range. The compact cylindrical housing fits flush into frames for a clean installation. White plastic construction suits residential and light commercial settings.

Upgrade From Surface-Mount Contacts

Recessed mounting replaces visible surface-mount switches when aesthetics or tamper resistance matter. The switch activates at distances up to 15mm, allowing a small installation tolerance. A 23cm lead connects each sensor to the alarm panel or transmitter. The jump is worth it when flush fit and concealed wiring are required.

Low-Voltage Circuit Capacity

Rated at 100V and 10W, the contacts handle typical alarm loop voltages and currents with headroom to spare. The 0.9cm diameter by 1.8cm depth body seats in standard drill holes. The 22g weight adds negligible load to frames. The reed mechanism has no moving parts to wear out under normal use.

How it compares

Measured against everything we stock in Sensors, Buzzers & Control Modules, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 93% of the 89 comparable items (median $29.99).

Specifications

Product
Brand nameUnique Bargains
Product typeHome Automation - Sensor & Accessories

Questions about this item

What hole diameter is required for the 0.9 cm sensor body?

Drill a hole matching the 0.9 cm diameter so the sensor sits flush in the door or window frame.

How do I align the magnet so the 0-15 mm actuation distance works reliably?

Mount the magnet on the moving part directly opposite the sensor, keeping the gap within 15 mm when closed.

Will the 10 W reed switch need replacement after a certain number of cycles?

Reed switches have no moving contacts to wear out, so the sensor typically lasts the life of the alarm system.

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