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Five brown cylindrical magnetic door sensors with wires

Unique-Bargains

Unique-Bargains RC-33 NC Recessed Magnetic Door Contact Sensor 5pcs Brown

SKU CH-XTFQ-498D9 MPN RC-33

Five-pack of recessed magnetic door contacts with normally-closed operation and a 15-25mm actuation distance

  • Product typeSurveillance - Home Safety & Security
  • NC circuit stays closed until the magnet moves away
  • Detects door movement from 15 to 25 mm distance
  • Works with any access control or burglar alarm system
  • Compact 17 mm by 10.7 mm housing fits recessed mounts
  • Five brown sensors included with 26 cm cables each

Magnetic Door Contact Sensor

The Unique-Bargains RC-33 is a normally closed magnetic reed switch sold in a pack of five brown units. Each sensor activates when the magnet sits within 15 to 25 mm, closing the circuit to signal a closed door or window. The ABS housings measure 17 by 10.7 mm and include 26 cm of 1007UL #24AWG wire. Rated for 0.5 A and 10 W at up to DC 100 V, they suit standard access control and burglar alarm panels.

Upgrade from surface contacts

These recessed sensors replace surface-mounted switches when a flush fit is preferred for aesthetics or tamper resistance. The 15 to 25 mm actuation range works with typical door gaps, and the NC logic integrates directly into existing alarm loops without rewiring. The jump is worthwhile when installers need a low-profile brown finish that blends with wooden or metal frames and a cable long enough to reach nearby wiring channels.

Installers needing flush NC sensors

This pack suits security professionals and DIY owners adding reed switches to multiple openings in a single project. The brown colour matches common door stains, and the 26 cm leads simplify routing to control panels. Buyers who require normally open logic, wireless connectivity, or a different housing colour should look at other models. Those needing longer cable runs or higher current ratings will also need alternative parts.

How it compares

Measured against everything we stock in Alarm Kits & Motion Sensors, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 95% of the 180 comparable items (median $30.99).

Specifications

Product
Brand nameUnique Bargains
Product typeSurveillance - Home Safety & Security

Questions about this item

What size hole do I drill for the 17 mm by 10.7 mm sensor body?

Drill a hole that fits a 17 mm tall by 10.7 mm diameter cylinder so the brown ABS housing sits flush with the door or frame edge.

How do I wire the 26 cm 24 AWG leads to my alarm panel without reversing the circuit?

Connect the two wires to the zone input; because the contact is normally closed the loop reads closed when the magnet is within 15 to 25 mm and opens when the door swings away.

When should I replace the reed switch if the 0.5 A rating is occasionally exceeded?

Replace the sensor if the contacts stick, show corrosion, or the magnet gap no longer triggers a clean open and close at the rated 10 W limit.

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