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    Seco-Larm ENFORCER SM-226LQ / SM-226L-3Q — Overhead Door Magnetic Contact Specifications

    September 08, 2026 1 min read

    Specifications for the Seco-Larm ENFORCER SM-226LQ (closed loop) and SM-226L-3Q (open/closed loop) overhead door magnetic contacts.

    💾 Download Original PDF 🛒 View Product
    Full text manual (for reference)

    Specifications for the Seco-Larm ENFORCER SM-226LQ and SM-226L-3Q — overhead door magnetic contacts with a 2-3/4" (70mm) gap, in closed-loop and open/closed-loop versions.

    Overview

    Used for overhead doors in both industrial and residential settings where a wide gap is present. The switch is contained in a curved low-profile cast-aluminum housing for surface mounting on the garage floor, adjustable to fit most door-channel widths, with the magnet enclosed in a gray ABS case on an L-bracket.

    Features

    • 2-3/4" (70mm) operating gap
    • 24" (61cm) wire leads enclosed in armored cable
    • Reed switch is SPST, deactivated rhodium on gold under-plating for longer life
    • SM-226LQ: for closed-loop circuits
    • SM-226L-3Q: for open/closed-loop circuits
    • Mounting bracket included; lifetime limited warranty

    Specifications

    Spec SM-226LQ SM-226L-3Q
    Circuit Type Closed loop Open/closed loop
    Operation Gap 2-3/4" (70mm)
    Switch Material Heavy-duty cast-aluminum case
    Terminal Material 24" (61cm) armored leads
    Magnet Material ABS plastic on L-bracket
    Contacts Deactivated rhodium on gold under-plating
    Contact Rating 0.1A@100VDC (max), 1.0A@10VDC (max), 10W (max) 0.02A@100VDC (max), 0.2A@10VDC (max), 3W (max)
    Temperature -15° to 160°F (-25° to 70°C)
    Switch Cycles 50 Million (0.1mA@5VDC)
    Switch Dimensions 4-11/32" x 1-3/4" x 27/64" (110 x 44 x 11mm)
    Magnet Dimensions 3-15/16" x 2" x 2" (100 x 51 x 51mm)
    Magnet Type Alnico 5

    Note: on wood surfaces, the magnet must be installed at least ¼" from the switch housing to comply with UL 681 installation requirements.