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  • SECO-LARM SM-4105-LQ — 3/4" Steel Door Recessed-Mount Magnetic Contact Manual

    August 31, 2026 2 min read

    SECO-LARM SM-4105-LQ recessed-mount magnetic door/window contact for steel-framed doors and windows.

    Full text manual (for reference)

    The SECO-LARM SM-4105-LQ is a 3/4" recessed-mount magnetic door/window contact designed for steel-framed doors and windows where surface-mount hardware is impractical or unsightly. It uses a strong one-piece high-impact ABS construction with iridium-plated SPST reed switch contacts for higher power handling and long service life.

    Available Colors

    • SM-4105-LQ/W — White
    • SM-4105-LQ/B — Black

    Key Features

    • Designed for steel-framed doors and windows where space is limited
    • Strong one-piece construction with high-impact ABS plastic housing
    • 18" (46cm) wire leads
    • Switch and magnet have ribs for securing in mounting holes
    • Iridium-plated SPST contact reed switch — high melting point and Vickers hardness for higher power handling and longer expected life
    • For closed loop circuits
    • 1" (25mm) maximum gap between contact and magnet
    • Lifetime limited warranty

    What's Included

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

    Installation

    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 it faces the contact. Ensure the gap between the contact and magnet does not exceed 1" (25mm).

    Warranty

    Lifetime Limited Warranty (U.S. and Canada; 1 year for all other countries): This SECO-LARM product is warranted against defects in material and workmanship for the lifetime of the product when used in normal service. SECO-LARM's obligation is limited to repair or replacement of any defective part if the unit is returned, transportation prepaid, to SECO-LARM. SECO-LARM is not responsible for removal, installation, or reinstallation costs. This warranty is void if damage is caused by acts of God, misuse, abuse, neglect, improper repair/alteration, or faulty installation.