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    • Home  / Product Manuals & Documentation
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    SECO-LARM SM-4201-LQ / SM-8201-LWQ Track-Mount Overhead Door Magnetic Contacts

    September 08, 2026 1 min read

    Specifications for the SECO-LARM Track-Mount Overhead Door Magnetic Contacts — adjustable closed-loop contacts for overhead garage-style doors.

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

    Specifications for the SECO-LARM Track-Mount Overhead Door Magnetic Contacts — SM-4201-LQ (standard L-bracket, track width 1-3/4"~2-5/8") and SM-8201-LWQ (wide L-bracket, track width 2-1/2"~4"). Both are adjustable closed-loop contacts designed for overhead garage-style doors in industrial and residential applications.

    Features

    • Used for overhead doors in both industrial and residential situations where a wide gap is present
    • SM-4201-LQ adjustable to fit track widths 1-3/4"~2-5/8"; SM-8201-LWQ (wide bracket) fits 2-1/2"~4"
    • Rugged aluminum housing
    • 36" (91cm) wire leads enclosed in armored cable
    • Contact type: SPST, iridium-plated for high melting point and Vickers hardness — higher power handling and longer expected life
    • For closed loop circuits
    • 3" (76mm) gap
    • Mounting bracket included
    • Lifetime limited warranty

    Specifications

    Item SM-4201-LQ SM-8201-LWQ
    Loop type Closed loop
    Electrical configuration N.O. (SPST)
    Operation gap 3" (76mm)
    Track width 1-3/4"~2-5/8" 2-1/2"~4"
    Connectors 36" (91cm) armored leads
    Case material Aluminum
    Contacts Iridium-plated
    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 3-1/8"x2-5/8"x1-13/16" (79x66x46mm)
    Magnet dimensions 3-1/4"x3-9/16"x1-3/4" (82x90x44mm)
    Magnet type Ferrite

    Copyright © 2022 SECO-LARM U.S.A, Inc. Specifications subject to change without notice.