GRI 401-B W/1K Industrial Surface Mount Switch Set, Standard Gap, Open Loop, Brown, Concealed Terminals, 1K Resistors

Secure perimeter doors and streamline monitoring with the George Risk Industries GRI 401-B surface-mount magnetic contact. Designed for commercial and industrial environments, this magnetic contact provides tamper-resistant protection thanks to concealed terminals and a robust steel housing. The GRI 401-B includes a built-in 1K EOL resistor for supervised alarm loops, helping technicians quickly identify wiring faults and maintain continuous security monitoring. With a standard 1.5" gap and UL/ULC plus UL 10C fire ratings, it’s suitable for most steel door/frame combinations — including fire-rated openings where code compliance is required. The brown finish and included spacers/mounting hardware make installation clean and unobtrusive, and 36" leads (or custom lengths on request) simplify integration with alarm panels, access control, and surveillance systems. Backed by a lifetime warranty, this N.C. open-loop switch set delivers reliable door sensing and long-term value for security integrators and facilities teams. Ideal for alarm, access control and monitoring applications—order the GRI 401-B to upgrade your door protection today.

• Tamper-resistant concealed terminals reduce vandalism and unauthorized access, improving long-term site security
• Built-in 1K end-of-line (EOL) resistor enables supervised alarm and monitoring circuits for reliable fault detection
• Standard 1.5" gap and durable steel construction provide consistent performance on commercial doors and steel frames
• UL, ULC and UL 10C fire ratings plus lifetime warranty deliver code-compliant protection and long service life for critical entry points
• Surface-mount design with included spacers and hardware simplifies retrofit and new-install integration with access control and alarm systems