SECO-LARM - SM-226R-3Q - Overhead Door Magnetic Contact, 70mm Gap

Product Overview

The SECO‑LARM SM‑226R‑3Q is an overhead door‑mount magnetic contact featuring a 2¾‑inch (70 mm) gap, an SPDT (NO/NC/COM) configuration for open or closed loop monitoring, and a die‑cast aluminum housing with 24‑inch armored leads for durability. It is rated IP66 weatherproof, supports 50 million switch cycles, and is designed for reliable overhead door position monitoring in industrial and residential applications.

Key Configuration

• Loop type: Open/closed loop (SPDT, NO/NC/COM)
• Operating gap: 2-3/4" (70mm)
• Contact rating: 0.2A @ 10VDC max, 3W max
• Switch cycles: 50 million (0.1mA @ 5VDC)
• Magnet type: Alnico 5 enclosed in epoxy in an aluminum housing
• Switch material: Heavy-duty cast-aluminum case

Key Features

The SM‑226R‑3Q is a heavy‑duty magnetic contact designed for overhead door position monitoring in industrial and residential applications, featuring a 2¾‑inch wide gap to accommodate loose‑fitting or large doors. Its curved, low‑profile cast‑aluminum switch housing surface‑mounts on the garage floor, while the magnet is epoxy‑filled inside an aluminum case with no projecting bracket to prevent damage or tampering.

Technical Context

The SPDT (NO/NC/COM) configuration supports both open and closed loop monitoring, with 24‑inch armored leads protecting against mechanical damage. The unit is IP66 weatherproof, operates from -25°C to 70°C, carries a lifetime limited warranty, and measures 110 × 44 × 11 mm (switch) and 90 × 33 × 37 mm (magnet).