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    • Home  / Product Manuals & Documentation
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    SECO-LARM SM-431-TQ/B & SM-431-TQ/W — Screw-Terminal Surface-Mount Contacts Product Information

    September 08, 2026 1 min read

    Product information for the SECO-LARM SM-431-TQ/B and SM-431-TQ/W Screw-Terminal Surface-Mount Contacts, miniature magnetic door/window contacts with a 1" gap, available in brown or white.

    💾 Download Original PDF
    Full text manual (for reference)

    Product information for the SECO-LARM SM-431-TQ/B and SM-431-TQ/W Screw-Terminal Surface-Mount Contacts — miniature magnetic door/window contacts with a 1" (25mm) gap, N.C. circuit type, available in brown or white with mounting tabs.

    Key Features

    • Miniature surface-mount magnetic contacts.
    • Screw mount using side tabs, or break off tabs for adhesive mount.
    • Gold-plated screw terminals for longer life and reliability.
    • Tape to cover screw terminals included.
    • Contact reed switch is SPST, iridium-plated for a high melting point and Vickers hardness, resulting in higher handling power and longer life.
    • 1" (25mm) gap; for N.C. circuits.
    • Mounting screws and double-sided tape included.
    • Lifetime limited warranty.

    Model Variants

    Model number SM-431-TQ/B SM-431-TQ/W
    Circuit type N.C.
    Terminals Gold-plated
    Color Brown White
    Mounting tabs Yes, removable

    Specifications

    Case material High-impact ABS plastic
    Terminal material Gold-plated
    Contacts Iridium-plated
    Contact rating 0.1A@100VDC max; 1.0A@10VDC max; 10W max
    Temperature -15°–160°F (-25°–70°C)
    Switch cycles 50 million (0.1mA@5VDC)
    Switch dimensions 2" x 3/8" x 1/4" (51 x 10 x 6 mm)
    Magnet dimensions 2" x 3/8" x 1/4" (51 x 10 x 6 mm)
    Magnet type Rare-earth neodymium
    Gap 1" (25mm)

    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