Honeywell 940 - Magnetic Door Contact and Window Contact Reviews

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Great Wired Door/Window Sensor!
Submitted on 09/23/2020 Alarm Grid

The Honeywell 940 is a popular hardwired door and window contact sensor. This sensor has stood the test of time due to its simplicity and effectiveness. It is a very simple door and window contact that does pretty much exactly what you would expect. The magnet goes on the moving portion of the door or window, while the sensor goes on the door or window frame. Opening the door or window causes the magnet to separate from the sensor, which triggers and alert on the security system. We think that the Honeywell 940 is a great sensor, and we give it a perfect 5-Star score.

Sometimes the best sensors are the ones that are the most straightforward. And that is clearly the case with the Honeywell 940. It is a very compact sensor, which means that you are unlikely to notice it on the door or window. It allows for a surprisingly large magnet spacing gap of 3/4", which is 50% larger than the standard 1/2" gap that most door and window sensors provide. The necessary mounting hardware for the sensor comes included, so you will have no trouble getting started with the Honeywell 940. We also like the fact that a cover hides the resistor for the resistor. This helps to maintain aesthetics.

The downsides for the Honeywell 940 are pretty standard. As a hardwired door and window sensor, you will need to run a wire from the panel to the sensor. This may be a bit tricky if you are not used to wiring. But that comes with the territory when setting up a wired alarm system. The fact that this sensor is Form A could be considered a small downside, as it will not allow Normally Open (NO) wiring. But really, these downsides are extremely minor, and honestly, they are to be expected from a basic wired door and window sensor like the Honeywell 940. This simple and effective sensor will serve your home or business quite well for a very long time. It gets a well-deserved 5-Star rating from Alarm Grid.

Good: Compact, 3/4" Magnet Spacing Gap, Mounting Hardware Included, Cover for Resistor

Bad: Requires Wiring, Form A

Bottom Line: 5 Stars