GRI B18012G Biased 3/4" Switch Closed Loop, Gray

For reliable door and window monitoring, the George Risk Industries B18012G magnetic contact delivers consistent, low-maintenance perimeter protection. This biased 3/4 in switch (closed loop) is engineered to reduce nuisance alarms and provide continuous supervision — ideal for intrusion detection, access control, and integration with surveillance systems. The compact gray housing mounts discreetly on narrow frames while offering rugged performance for commercial and multi-family residential installations. Sold as a convenient 10-pack (Packaged Quantity: 10, Mfr. Part Number B18012G), the set lowers per-unit cost for installers and facilities managers who need multiple sensors for warehouses, office suites, or retail storefronts. Compatibility with standard alarm panels and monitoring equipment ensures quick wiring and commissioning, and the biased closed-loop design supports better system diagnostics and tamper detection. Choose the GRI B18012G when you need dependable security contacts that minimize downtime and simplify maintenance. Order a 10-pack today to upgrade your access control and surveillance perimeter monitoring.

• Reliable closed-loop monitoring: Biased 3/4" switch design reduces false alarms and ensures consistent contact supervision for security systems.
• Compact, low-profile form: 3/4 in size and gray finish fit tight door and window frames for discreet installation in commercial and residential sites.
• Durable, field-proven construction: Built by George Risk Industries for long-term performance in access control, intrusion detection, and perimeter monitoring.
• Easy integration: Standard magnetic contact type compatible with most alarm panels and surveillance systems for fast deployment.
• Economical multi-pack: Sold in a 10-pack (Mfr. Part B18012G) to efficiently outfit multiple doors or to stock maintenance spares.