Surface-mounted reed switch contact sensor Alarmtech MC 270-S45, Grade 3

The Alarmtech MC 270-S45 is a surface-mounted reed switch contact sensor designed for reliable door and window monitoring. This compact magnetic contact provides basic open/close state detection for alarm systems and access control panels without the need for recessed installation. Built for applications requiring Grade 3 security, the MC 270-S45 suits both residential and commercial environments where a higher-than-basic intrusion detection level is needed.

Advantages

The surface-mounted design enables quick installation on most frames and casings without cutting or mortising. The reed switch mechanism offers a simple, low-power solution compatible with conventional wired alarm inputs. Its Grade 3 classification indicates enhanced robustness and suitability for environments with greater security demands. The sensor's small footprint minimizes visual impact while providing dependable contact monitoring for doors and windows.

Suitable for

• Monitoring external and internal doors
• Window contact detection in homes and offices
• Integration with wired alarm systems and access control panels
• Sites requiring Grade 3 security level

Key specifications

• Type: Surface-mounted magnetic reed contact
• Function: Normally closed / open state detection (magnetic actuation)
• Installation: Surface mounting on frame and leaf without recessing
• Security class: Grade 3
• Compatibility: Designed for wired alarm and access control inputs
• Form factor: Compact, low-profile housing for discreet mounting

How to use

Mount the main sensor body to the fixed frame and the magnetic element to the moving leaf so that the two parts align when the door or window is closed. Connect the sensor leads to the alarm panel or access control input according to the panel's wiring diagram, observing correct polarity and tamper circuits if applicable. Test the contact by opening and closing the door or window and verifying corresponding state changes on the control panel. For reliable operation ensure alignment tolerance and gap specifications are met during installation.

Usage recommendations

For optimal performance, install the sensor on a clean, flat surface and avoid mounting in locations with heavy vibration or metallic obstructions that may interfere with magnetic operation. Verify compatibility with the specific alarm panel input requirements and, where necessary, use appropriate end-of-line resistors or tamper wiring as required by the security system design.