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  • SECO-LARM SM-4103-LQ/W — 3/8" Rare-Earth Recessed-Mount Magnetic Contact Manual

    September 08, 2026 2 min read

    Installation instructions for the SECO-LARM SM-4103-LQ/W, a 3/8" rare-earth recessed-mount magnetic contact switch for sliding doors and windows.

    Full text manual (for reference)

    Overview

    The SECO-LARM SM-4103-LQ/W is a 3/8" (10mm) press-fit rare-earth recessed-mount magnetic contact switch, designed for protecting sliding doors and windows where installation space is limited. Its miniature size makes it easy to conceal.

    Key Features

    • 3/8" (10mm) press-fit with stubby 9/16" (14mm) switch
    • Rare-earth magnet with nickel plating to resist chipping and corrosion
    • High-impact ABS plastic construction
    • Miniature size for easier concealment
    • Switch has ribs for secure fit in mounting holes
    • 18" (46cm) wire leads
    • Contact reed switch: SPST, ruthenium on gold underplating for longer expected life
    • For closed loop (N.C.) circuits
    • 1/2" (13mm) maximum gap between contact and magnet
    • Lifetime limited warranty

    What's Included

    • 10x Contact Switches
    • 10x Magnets
    • 10x Spacers
    • 10x Screws
    • 1x Manual

    Installation Instructions

    1. Mount the contact above the door or window on the frame. For doors, ensure the mounting is farthest from the hinged side of the door.
    2. Connect two wires to the contact terminals and to the alarm control panel.
    3. Mount the magnet on the door/window so that it faces the contact. Be sure the gap between the contact and magnet does not exceed 1/2" (13mm).

    Specifications Summary

    Spec Value
    Mounting Style 3/8" (10mm) press-fit
    Switch Size 9/16" (14mm) stubby
    Wire Leads 18" (46cm)
    Switch Type SPST reed switch, ruthenium on gold underplating
    Circuit Type Closed loop (N.C.)
    Max Gap 1/2" (13mm)
    Case Material High-impact ABS plastic
    Magnet Rare-earth, nickel plated

    Warranty

    Lifetime Limited Warranty (US and Canada; 1 year for all other countries). SECO-LARM's obligation is limited to repair or replacement of defective parts if the unit is returned, transportation prepaid. Warranty is void for damage caused by acts of God, misuse, abuse, neglect, improper installation, or unauthorized repair/alteration.