The 1L-MSR-104H Recessed Mount Magnetic Reed Sensor is a specially manufactured by 1 LEAP Technologies, a recognized sensor for industrial, architectural, and marine applications. This model has been developed for installations where surface mounting is not practical, where mechanical protection is essential, and where a wide and forgiving operating gap is required for consistent performance.
This product is not intended for compact electronic devices or consumer equipment. The 1L-MSR-104H magnetic reed sensor is designed exclusively for fixed structural installations, heavy panels, access systems, and safety monitoring applications where durability, stability, and installation integrity are more important than miniaturization.
Key Features
- 3/8″ Dia with Adaptor Holder
- Easy & Quick Installation
- ¾″ Adaptor Holder
- Wide Operating Gap ¾″ (19mm) min.
¾” Adaptor / Holder for Strong Mechanical Stability
The 3/8 inch diameter switch body of the 1L-MSR-104H magnetic reed sensor allows installation in structurally limited spaces without compromising sensing performance. To support secure installation, the switch is supplied with a precision-engineered adaptor holder that ensures correct positioning within the drilled cavity.
This adaptor holder prevents lateral movement and maintains consistent alignment between the magnetic switch and its mating magnet, even over long periods of operation. The result is stable switching behavior and reduced maintenance requirements.
3/8″ Diameter Switch with Precision Adaptor Holder
A major advantage of this model is the ¾ inch adaptor / holder, which provides firm mechanical retention inside the mounting surface. This feature is particularly important in applications where vibration, structural flexing, or repeated opening and closing cycles are expected.
In shipbuilding and industrial installations, components are often subjected to continuous mechanical stress. The 1L-MSR-104H recessed mount magnetic switch remains securely fixed, ensuring that sensing accuracy is maintained throughout its operational life.
Recessed Mount Design
The defining characteristic of the 1L-MSR-104H recessed reed switch is its recessed mounting construction. The switch is installed inside a drilled cavity, allowing the sensing element to remain completely protected within the mounting material. Once installed, the body of the switch sits flush with the surface, eliminating any external projection.
This design significantly reduces the risk of mechanical damage caused by accidental impact, vibration, or repeated operational movement. In environments such as shipbuilding structures and architectural frameworks, recessed mounting ensures both long service life and a clean, unobtrusive appearance.
Electrical Performance Optimized for Industrial Use
Contact Resistance: Minimum 150 Milli-Ohms
The contact resistance specification of 150 milli-ohms (minimum) in the 1L-MSR-104H electronic switch is intentionally selected to suit industrial sensing and monitoring circuits. This resistance level ensures stable signal transmission while maintaining durability of the reed contacts over extended switching cycles.
In heavy-duty applications, extremely low contact resistance is not a necessity and may lead to faster contact degradation. The 150 mΩ value provides an optimal balance between electrical efficiency and long-term contact reliability, making this magnetic red sensor suitable for continuous monitoring systems and control circuits.
Application Of 1L-MSR-104H
Shipbuilding and Marine Structures
The 1L-MSR-104H recessed mount magnetic switch is widely used in shipbuilding for monitoring:
- Hatch open/close status
- Access doors and service panels
- Compartment and enclosure positions
The recessed design protects the sensor from mechanical damage and operational stress commonly found in marine environments.
Architectural and Building Installations
In architectural projects, this recessed switch is used for:
- Heavy architectural doors
- Structural access panels
- Concealed safety and security monitoring systems
The flush mounting design preserves architectural aesthetics while delivering reliable sensing performance.
Industrial Structural Monitoring
The 1L-MSR-104H magnetic switch is also suitable for industrial installations such as:
- Fixed machinery enclosures
- Industrial access points
- Safety interlock and position monitoring systems
Its strong mechanical retention and wide operating gap make it reliable even in demanding industrial conditions.




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