GRI 28A-B Surface Mount Magnetic Reed Switch Set, Closed Loop, Standard Gap up to 1", Concealed Terminals, Brown

Deliver dependable perimeter security without installation headaches. The George Risk Industries GRI 28A-B surface mount magnetic contact set provides closed-loop intrusion monitoring that integrates easily with alarm panels, access control and surveillance systems. Built for commercial and industrial use, its standard 1" gap and Form A (N.O.) contact make it compatible with most wired security architectures, while concealed screw terminals reduce tamper exposure and present a clean, professional installation.

Constructed of steel with UL/ULC recognition and backed by a lifetime warranty, the 28A-B is engineered for long service life in high-traffic environments. The surface-mount profile and included covers, spacers and hardware speed up field installs, and the brown finish offers a discreet option for wood doors and darker frames. Whether you’re deploying perimeter sensors, door contacts for access control, or integration points for CCTV-triggered events, the GRI 28A-B delivers reliable, industry-standard performance.

Specify the GRI 28A-B for your next intrusion detection or access-control deployment — contact us to order or request technical support for system integration.

• Reliable closed-loop perimeter monitoring for doors and windows, reducing false alarms and simplifying site supervision
• Surface-mount design with concealed screw terminals for fast, tamper-resistant installation on metal or wood frames
• Standard 1" gap (up to 1") and Form A (N.O.) contact ensure broad compatibility with alarm panels and access control systems
• UL listed, steel construction and lifetime warranty for long-term performance in commercial and industrial environments
• Brown finish blends with wood and darker frames for discreet security integration with surveillance and monitoring systems