A magnetic contact switch’s gap rating indicates how far the magnet and switch can separate while the circuit remains closed, so the rating should match the installed spacing and movement of the door, window, gate, or overhead door. Smaller gaps often suit recessed or thin-frame window and door installations, while larger-gap contacts can accommodate wider spacing found on gates and overhead doors, provided the switch and magnet align when closed.

Magnetic contact switches are available with two-wire or three-wire armored leads, terminal connections, and self-adhesive units with wire leads, depending on the installation. Common contact configurations include normally open, Form A single-pole single-throw (SPST), and closed-loop designs, with options for wiring multiple contacts in series on one security zone.

For indoor residential or light-commercial openings, consider surface-mount or recessed magnetic contact switches, while track-mount designs support overhead doors and roller tracks; exposed installations call for durable housings with an IP rating, such as IP65 or IP66. Match the contact’s closed gap, wiring configuration, mounting method, and switch form to the opening, frame, and security panel.

Compare surface-mount, recessed, press-fit, adhesive, screw-mounted, and track-mount magnetic contact switches based on the available space, material, and required alignment. Surface-mount contacts suit doors and frames, recessed or press-fit contacts provide a lower-profile option for compatible doors and windows, adhesive mounts support simpler indoor installations, and track-mount designs fit overhead door tracks.