Model No. 1L-MSR-104H
3/8″ (9mm) dia. with ¾” Adaptor Holder
Key Features
- 3/8″ Dia with Adaptor Holder
- Easy & Quick Installation
- ¾” Adaptor Holder
- Wide Operating Gap ¾” (19mm) min.

Industrial-Grade Magnetic Reed Switch by 1 LEAP Technologies
The 1L-MSR-104H Recessed Mount Magnetic Switch is a specially engineered magnetic reed switch sensor manufactured by 1 LEAP Technologies, a recognized sensor and reed manufacturer 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 switch 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.
1L-MSR-104H – Recessed Mount Magnetic Switch
Specification:-
- Contact Rating : 10W/VA
- Switching Voltage (Max.) : 200 VDC
- Switching Current (Max.) : 0.5 Amp.
- Contact Resistance (Min.) : 150 milli ohms
- Life Expectancy : 10x 10 6 Operations
- Insulation Resistance : 10 9 ohms
- Shock Resistance : 30G for 11mSec.
- Vibration Resistance : 20G ( 10 to 1000Hz)
- Magnets : ALINCO/ Rare Earth (Unless otherwise specified)
- Armour Jacket : Stainless Steel (Type 304)
- Plastic Material : ABS Plastic (Unless otherwise specified
Purpose-Built 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.
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.
¾" Adaptor / Holder for Strong Mechanical Stability
The 3/8 inch diameter switch body of the 1L-MSR-104H magnetic reed switch 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 sensor and its mating magnet, even over long periods of operation. The result is stable switching behavior and reduced maintenance requirements.
Easy and Quick Installation in Structural Applications
The 1L-MSR-104H magnetic switch is designed to simplify installation without sacrificing reliability. The recessed mounting method, combined with the adaptor holder, allows installers to complete installations quickly while achieving a professional and secure finish.
This ease of installation is highly beneficial in large architectural projects and industrial sites where multiple sensors are installed across panels, doors, or access points. Reduced installation complexity translates directly into lower labor time and consistent installation quality.
Wide Operating Gap for Flexible Alignment
One of the most important functional advantages of the 1L-MSR-104H magnetic reed switch is its wide operating gap of minimum ¾ inch (19 mm). This wide sensing distance allows the switch to operate reliably even when perfect alignment between the switch and magnet is difficult to achieve.
In real-world structural applications such as ship hatches, heavy doors, and architectural access panels, slight misalignment is common due to material expansion, vibration, or long-term wear. The wide operating gap ensures dependable switching performance despite these variations.
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 reed 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 switch sensor suitable for continuous monitoring systems and control circuits.
Application Areas – Designed Exclusively for 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 reed 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.
Why Choose 1L-MSR-104H from 1 LEAP Technologies
As an experienced reed sensor manufacturer, 1 LEAP Technologies designs each magnetic reed switch with application-specific engineering. The 1L-MSR-104H recessed mount magnetic switch is not a generic product; it is a purpose-built magnetic switch sensor developed for environments where strength, reliability, and concealed installation are essential.
