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    • Home  / Product Manuals & Documentation
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    Seco-Larm SM-4104-TQ/W 3/4in Steel Door Recessed-Mount Contact — Product Information

    September 08, 2026 1 min read

    Product information for the Seco-Larm SM-4104-TQ/W recessed-mount magnetic contact for steel-framed doors and windows.

    💾 Download Original PDF
    Full text manual (for reference)

    Product information for the Seco-Larm SM-4104-TQ/W ¾" Steel Door Recessed-Mount Contact — a recessed magnetic door/window sensor designed for steel-framed doors and windows where space is limited or exposed hardware is undesirable.

    Features

    • Designed for steel-framed doors and windows where space is limited, or to avoid unsightly surface-mount installations
    • Strong one-piece construction, high-impact ABS plastic housing
    • Gold-plated screw terminals for longer expected life and reliability
    • Switch and magnet have ribs for secure fit in mounting holes
    • SPST contact reed switch: iridium-plated for high melting point and Vickers hardness, giving higher power handling and longer expected life
    • For closed-loop circuits, 1" (25mm) gap
    • Lifetime limited warranty

    Specifications

    Spec Value
    Circuit type Closed loop
    Operation gap 1" (25mm)
    Color White
    Case material High-impact ABS plastic
    Terminal material Gold-plated
    Contact material Iridium-plated
    Contact rating 0.1A@100VDC (max), 1.0A@10VDC (max), 10W (max)
    Temperature range -15°F to 160°F (-25°C to 70°C)
    Switch cycles 50 million (0.1mA@5VDC)
    Switch dimensions 13/16" x 15/16" x 3/8" (30 x 24 x 9mm)
    Magnet dimensions 13/16" x 15/16" x 1/2" (30 x 24 x 13mm)
    Magnet type Rare-earth Neodymium

    Manufacturer

    SECO-LARM U.S.A., Inc., 16842 Millikan Avenue, Irvine, CA 92606. Phone: (949) 261-2999 / (800) 662-0800.