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Garage Door Sensor

Heavy duty contact-closure sensor for garage doors. Remotely monitor using a ControlByWeb device.


Monitor doors remotely with magnetic closure sensors. The GRI-4701-A sensors are designed to eliminate false alarms that are common with standard floor switches getting damaged by fork lifts or other equipment. The contacts are moved up onto the track and out of the way of heavy equipment. These sensors are easy to install and very adjustable. They can attach to a variety of track sizes and can be installed on either side of the door. The sensors can have a gap of up to 3 inches which means mis-alignment due to wear and tear on the door is not a problem. The sensor offers form C contacts so both NO and NC circuits are supported.

The GRI-4801-A can be connected to any ControlByWeb product with a digital input. When the magnet is within proximity of the sensor switch, it will apply a voltage to the digital input, turning it ‘On.’ When the input changes, ControlByWeb module can be configured to send email/text alerts, control remote relays (for alarms at a remote location), and/or log events.

Garage Door Sensor Wiring Diagram (N/O Circuit)

Garage door sensor wiring diagram

Garage Door Sensor Mounting

The GRI-4701-A comes with a multi-angle mounting bracket, making it able to mount to many different types of garage door. The magnetic switch has a simple built-in clamp that allows it to simply mount onto the garage door rail without interfering with the garage door's movement.

Garage door sensor wiring diagram
Garage door sensor wiring diagram
Garage door sensor wiring diagram

The GRI-4701-A is easily mounted on a garage door rail.


  • Mountable up to 3" apart
  • Contact Form: C
  • Circuit Types: Normally Open/Normally Closed
  • Track Mountable
  • Left or Right Installation
  • 3 ft Armored Cable
  • Multi-Position Adjustable Magnet Bracket

  Compatible Products

The 4701-A is compatible with all ControlByWeb® products that have a digital input.

Garage Door Contact Sensor

In Stock




Maximum Switching Voltage/Current: 48VDC/0.250A

Circuit Types: Open/Closed



Please contact our sales department for quantity discounts.




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