Seco-Larm SM-4201-LQ 3" Track-Mount Overhead Door Magnetic Contact.

Features

• Used for overhead doors in both industrial and residential situations where a wide gap is present
• Adjustable to fit most door-channel widths
• Rugged aluminum housing
• 36″ (91cm) Wire leads enclosed in armored cable
• Contact Type: SPST, iridium-plated to have a high melting point and Vickers hardness for higher power handling and longer expected life
• For closed loop circuits
• 3″ (76mm) Gap
• IP65 Weatherproof
• Mounting bracket included