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    SECO-LARM SM-4004-TQ/W & SM-4004-LQ/W — Capsule-Type Surface-Mount Magnetic Contacts Spec Sheet

    September 08, 2026 2 min read

    Specification sheet for the SECO-LARM SM-4004-TQ/W and SM-4004-LQ/W capsule-type surface-mount magnetic contacts, miniature contacts for closed-loop security circuits.

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    Full text manual (for reference)

    Specification sheet for the SECO-LARM SM-4004-TQ/W and SM-4004-LQ/W Capsule-Type Surface-Mount Magnetic Contacts — miniature contacts for closed-loop security circuits.

    Overview

    These are miniature capsule-type surface-mount magnetic contacts for normally-closed (closed loop) circuits, available with either gold-plated screw terminals (SM-4004-TQ/W) or 18" wire leads from center (SM-4004-LQ/W). Both use adhesive mounting (double-sided tape included) and feature a rare-earth neodymium magnet.

    Model Comparison

    Spec SM-4004-TQ/W SM-4004-LQ/W
    Loop type Closed loop
    Electrical configuration N.O. (SPST)
    Operation gap 1" (25mm) 3/4" (19mm)
    Connectors Gold-plated screw terminals 18" (46cm) leads from center
    Color White
    Material High-impact ABS plastic
    Contacts Iridium plating 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 1" x 3/8" x 1/4" (25 x 10 x 6 mm)
    Magnet dimensions 1" x 3/8" x 1/4" (25 x 10 x 6 mm)
    Magnet type Rare-earth neodymium

    Features

    • Miniature capsule-type surface-mount magnetic contacts
    • Gold-plated external screw terminals for longer life and reliability, with tape to cover terminals (SM-4004-TQ only)
    • 18" (46cm) wire leads from center (SM-4004-LQ only)
    • Adhesive mounting (double-sided tape included)
    • SM-4004-TQ: iridium-plated reed switch for a high melting point and Vickers hardness — higher power handling, longer expected life
    • SM-4004-LQ: ruthenium on gold underplating for a longer expected life
    • For closed loop circuits
    • Lifetime limited warranty

    Gap Sizes

    • SM-4004-TQ/W: 1" (25mm) gap
    • SM-4004-LQ/W: 3/4" (19mm) gap

    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