Door contact sensor BLOW 2765# model HO-03IK magnetic reed switch

Wired door contact sensor BLOW 2765# (model HO-03IK) is a magnetic reed switch intended to detect the open or closed state of doors and windows. The sensor consists of two compact parts: a magnet and a reed switch. When mounted on a frame and the corresponding sash or door, the circuit closes as the two parts align, providing a clear binary signal suitable for integration with alarm panels, access control units and other security inputs.

Advantages

The sensor offers a simple wired connection that ensures continuous power and a stable signal without reliance on batteries. Its compact dimensions allow discreet mounting on most door and window profiles. The magnetic reed design provides reliable mechanical operation with low power consumption at the input stage of a security system. Installation is straightforward and the device yields a clear open/closed status suitable for monitoring and automation.

Suitable for

• Basic alarm systems and wired security installations
• Access control systems requiring door state input
• Window and door monitoring in residential and commercial buildings
• Integration with automation systems for state-dependent actions

Key specifications

• Type: Wired magnetic reed contact (magnet + switch)
• Function: Detects open/closed state of doors and windows
• Mounting: Surface mount on frame and sash
• Signal: Binary closed/open circuit output
• Construction: Compact two-piece design for discreet installation

How to use

Position the magnet and the reed switch so they align when the door or window is closed, keeping the specified gap recommended by the manufacturer for reliable operation. Secure both parts to the frame and sash using screws or adhesive as appropriate for the surface. Connect the wired terminals to the corresponding input zone on the alarm panel or access control device following the wiring diagram and ensuring correct polarity where applicable. Perform a functional test by opening and closing the door or window to verify the panel registers the state changes consistently.

Usage recommendations

For best performance, install the sensor away from strong external magnetic fields and ensure the mounting surfaces are clean and flat. Verify compatibility with the control panel input type (normally closed or normally open) before finalizing connections. Regularly inspect mounting and wiring during maintenance checks to maintain reliable detection.