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    • Home  / Product Manuals & Documentation
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    SECO-LARM SM-4103-LQ/W — 3/8" Rare-Earth Recessed-Mount Magnetic Contact Spec Sheet

    September 08, 2026 1 min read

    Specification sheet for the SECO-LARM SM-4103-LQ/W 3/8" rare-earth recessed-mount magnetic contact, a compact press-fit sensor for sliding doors and windows with limited installation space.

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    Full text manual (for reference)

    Specification sheet for the SECO-LARM SM-4103-LQ/W 3/8" Rare-Earth Recessed-Mount Magnetic Contact — a compact press-fit sensor for sliding doors and windows with limited installation space.

    Overview

    The SM-4103-LQ/W is a 1/2" (13mm) gap, closed loop magnetic contact with wire leads, designed for protecting sliding doors and windows where space is limited. Please visit the SECO-LARM website (www.seco-larm.com) for complete installation instructions and read the manual carefully before beginning installation.

    Features

    • Used for protecting sliding doors and windows where space is limited
    • 3/8" (10mm) press-fit with stubby 9/16" (14mm) switch
    • Rare-earth magnet with nickel plating to protect against chipping and corrosion
    • High-impact ABS plastic
    • Miniature size for easier concealment
    • Switch has ribs for securing in holes
    • 18" (46cm) wire leads
    • 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

    Loop type Closed loop
    Electrical configuration N.O. (SPST)
    Operation gap 1/2" (13mm)
    Connectors 18" (46cm) leads
    Color White
    Case material High-impact ABS plastic
    Contacts Ruthenium on gold underplating
    Contact rating 1.0A @10VDC (max.), 10W (max.)
    Operating temperature -15° to 160° F (-25° to 70° C)
    Switch cycles 50 Million (0.1mA @5VDC)
    Switch dimensions 9/16" x ø7/16" (14 x ø11 mm)
    Magnet type Rare-earth neodymium

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