Where should a magnetic switch be installed on a door?

Where should a magnetic switch be installed on a door?

• A. At the top and on the side away from the hinge
• B. At the bottom edge
• C. On the inside edge near the hinge
• D. On the door frame

Answer: (A)

A magnetic door contact works best when the stationary part is mounted on the door frame and the magnet is on the moving door so they align cleanly when the door is closed. Placing the switch at the top of the door frame on the side away from the hinge (the latch side) keeps the alignment stable as the door operates, minimizes interference from hinges and hardware, and avoids the dirt, wear, or damage that can occur lower on the frame. This position also accounts for door sag and weather stripping, which are less likely to disrupt the sensor at the top edge. Placing the switch elsewhere—bottom edge, near the hinge, or simply on the frame in a different spot—can lead to misalignment or false alarms because the door or frame moves and settles differently in those areas. Installing at the top latch-side of the frame ensures reliable operation and easy maintenance.

A magnetic door contact works best when the stationary part is mounted on the door frame and the magnet is on the moving door so they align cleanly when the door is closed. Placing the switch at the top of the door frame on the side away from the hinge (the latch side) keeps the alignment stable as the door operates, minimizes interference from hinges and hardware, and avoids the dirt, wear, or damage that can occur lower on the frame. This position also accounts for door sag and weather stripping, which are less likely to disrupt the sensor at the top edge. Placing the switch elsewhere—bottom edge, near the hinge, or simply on the frame in a different spot—can lead to misalignment or false alarms because the door or frame moves and settles differently in those areas. Installing at the top latch-side of the frame ensures reliable operation and easy maintenance.