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    • Home  / Product Manuals & Documentation
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    SECO-LARM SM-4103-TQ/W — 3/8" Rare-Earth Recessed-Mount Contact Specifications

    September 08, 2026 1 min read

    Specifications for the SECO-LARM SM-4103-TQ/W 3/8" Rare-Earth Recessed-Mount Contact, a miniature closed-loop magnetic contact for sliding doors and windows.

    💾 Download Original PDF
    Full text manual (for reference)

    Specifications for the SECO-LARM SM-4103-TQ/W 3/8" Rare-Earth Recessed-Mount Contact — a miniature door/window magnetic contact for closed-loop circuits, designed for sliding doors and windows where space is limited.

    Key Features

    • Used for protecting sliding doors and windows where space is limited.
    • 3/8" (10mm) press-fit with stubby 15/16" (24mm) switch.
    • Rare-earth magnet with nickel plating to protect against chipping and corrosion.
    • Gold-plated terminals for longer expected life and reliability.
    • High-impact ABS plastic housing.
    • Miniature size for easier concealment; switch and magnet have ribs for securing in drilled holes.
    • Screw terminals.
    • Contact reed switch is SPST, ruthenium on gold underplating for a longer expected life.
    • For closed loop circuits; 1/2" (13mm) gap.
    • Lifetime limited warranty.

    Specifications

    Model SM-4103-TQ/W
    Loop type Closed loop
    Electrical configuration N.O. (SPST)
    Operation gap 1/2" (13mm)
    Connectors Gold-plated screw terminals
    Color White
    Case material High-impact ABS plastic
    Contacts Ruthenium on gold underplating
    Contact rating 0.1A@100VDC max; 1.0A@10VDC max; 10W max
    Operating temperature -15°–160°F (-25°–70°C)
    Switch cycles 50 million (0.1mA@5VDC)
    Switch dimensions 15/16" x ø7/16" (24 x ø11 mm)
    Magnet Rare-earth neodymium alloy

    Warranty & Notice

    SECO-LARM's policy is one of continual development; specifications and prices are subject to change without notice. SECO-LARM is not responsible for misprints.

    SECO-LARM U.S.A., Inc. — 16842 Millikan Avenue, Irvine, CA 92606 | (949) 261-2999 / (800) 662-0800 | www.seco-larm.com