The HDL Automation MC-31 contact sensor is designed for alarm systems and is intended to detect the open or closed status of doors and windows. It consists of the following components: a reed contact and a magnet. The sensor typically operates as normally closed (NC), with a normally open (NO) option available.

When the magnet is near the reed contact, the circuit is activated, and when the magnet is moved away, an alarm signal is triggered.

• Switch: Normally closed (NC) with normally open (NO) option
• Operating distance: At least 20 mm
• Maximum operating voltage: 100V AC/DC
• Maximum switch current: 0.5A
• Power rating: 10W
• Operating temperature range: -20 to 80°C
• Housing material: ABS in white color
• Connection type: Screws
• Lifespan: Over 100,000 operations
• Mounting method: Surface-mounted or built-in for doors and windows