The 0E-DC4811 3" Track-Mount Magnetic Contact is a rugged, precision-engineered security device designed for monitoring and protecting overhead and roller doors in both commercial and residential installations. Built for easy and secure track mounting, it accommodates roller tracks up to 3 inches in width, ensuring compatibility with a wide range of door systems. Featuring a Normally Open (N.O.) closed loop configuration with a Single-Pole Single-Throw (SPST) reed switch, it delivers consistent detection and reliable performance. The 2.5" (65 mm) closed gap and 2.65" (67 mm) departure gap ensure dependable activation while allowing for slight misalignment common in high-use environments. Constructed from heavy-duty extruded aluminum, the housing is crush-resistant and vandal-resistant, offering exceptional durability in industrial or high-security settings. The 27" (68.6 cm) armored cable leads provide tamper resistance and long-term protection against physical wear and damage. Rated at 30VDC, 0.2A, 5W maximum, the unit maintains a low initial contact resistance of 0.20 Ω, ensuring signal integrity. With compact dimensions—3.5" x 1.7" x 3.2" magnet and 2.6" x 1.8" x 3" switch—this track-mounted contact integrates seamlessly into existing setups. Ideal for applications requiring both strength and reliability, such as warehouses, distribution centers, and secured residential garages, the 0E-DC4811 combines mechanical resilience with dependable electronic performance.