GRI 250-36HD Overhead Door Switch Set, Wall Mount, Closed Loop, 3" Gap, Heavy Duty Magnet

Secure heavy industrial overhead doors with a crush‑resistant, high-reliability magnetic contact built for demanding access control and security monitoring. The George Risk Industries GRI 250-36HD overhead door switch set is a wall-mount, closed-loop magnetic contact designed to survive motorized traffic and harsh environments. Its extruded 6063 T5 aluminum housing is tested to withstand up to 20,000 pounds without damaging the hermetically sealed reed switch, while plated contacts resist sticking or freezing for consistent surveillance and alarm performance.

This GRI magnetic contact features a standard 3" gap and a 36" #22 AWG stainless steel armored cable for durable, tamper-resistant wired connectivity. The set includes the heavy-duty magnet, mounting bracket and hardware for quick installation, and supports end-of-line (EOL) resistors or supervisory loops on request to integrate seamlessly with security panels and access-control systems. Backed by a lifetime warranty, the 250-36HD is ideal for warehouses, loading docks and commercial facilities that require robust, low-voltage door monitoring. Specify the GRI 250-36HD for your next overhead door security project — order now or contact us for integration support.

• Protects industrial overhead doors under heavy traffic and forklifts, minimizing downtime and false alarms
• Crush-resistant extruded aluminum housing tested to 20,000 lbs for reliable, long-lasting protection
• Hermetically sealed reed and plated contacts resist sticking or freezing for dependable security monitoring
• 36" #22 AWG stainless steel armored cable and universal mounting make installation and retrofit fast and secure
• Lifetime warranty and optional EOL resistors/supervisory loops simplify integration with access control and alarm systems