Door magnetic contact sensor BLOW 4923# HO-03L brown

Wired door magnetic contact sensor BLOW 4923# HO-03L in brown is a compact reed-switch sensor designed to monitor the open/closed state of doors and windows. Intended for surface mounting on frames, the sensor provides a simple electrical contact change when the magnet moves away from or toward the sensor body. It is compatible with alarm systems and access control panels that accept wired magnetic contacts and is suitable for triggering alerts, automation scenarios, or security monitoring.

Advantages

The BLOW HO-03L contact sensor features a compact housing and low-profile design that fits discreetly on most door and window frames. Its wired connection ensures reliable signal transmission without dependence on batteries. The reed-switch mechanism provides straightforward on/off state detection with minimal maintenance requirements. The brown finish allows the device to blend with darker frames or interiors where visual discretion is preferred.

Suitable for

• Monitoring interior and exterior doors in homes or small offices
• Window open/close detection for security systems
• Integration with alarm panels and access control systems
• Triggering automation events such as lighting or notification when a door opens

Key specifications

• Type: Wired magnetic contact sensor with reed switch
• Mounting: Surface mount on door or window frames
• Color: Brown
• Housing: Compact, low-profile design suitable for discreet installation
• Operation: Detects proximity of a magnet to indicate open/closed state
• Connection: Hardwired electrical terminals for integration with control panels

How to use

Install the sensor body on the stationary part of the frame and align the magnet on the moving part (door or window) so that the two elements are opposite when the door is closed. Secure both parts with screws or appropriate adhesive according to the mounting surface, ensuring consistent alignment across the full range of motion. Connect the sensor wires to the alarm or access control input following the system wiring diagram and verify the correct normally closed (NC) or normally open (NO) behavior required by your panel. Test the sensor by opening and closing the door or window and confirming the control panel registers state changes.

Usage recommendations

Use the sensor in dry indoor or sheltered outdoor locations to avoid direct prolonged exposure to moisture. Maintain correct alignment between the magnet and sensor body to ensure reliable operation; if wiring passes through door or window frames, use strain relief to protect connections. If the control panel requires supervision or end-of-line resistors, install those components according to the panel manufacturer’s instructions.