1L-MSR-103 Recessed Mount Magnetic Switch
3/8″ (9mm) dia. Collared with Wire Leads
Key Features
- 3/8″ (9mm) Dia Press Fit
- Operating Gap 5/8″ (16mm) min.
- 18″ Long Wire Leads
- ¾” Collar Flange for Better Retention

The 1L-MSR-103 Recessed Mount Magnetic Switch by 1 LEAP Technologies is a high-performance industrial magnetic switch made for accurate position sensing in fixed and heavy-duty environments. This model is specifically designed to be installed inside a drilled cavity, allowing the switch to remain flush with the mounting surface while making sure an excellent mechanical protection and long-term reliability.
Unlike surface-mounted sensors, the recessed mounting design of the 1L-MSR-103 minimizes external exposure, making it suitable for industrial installations where physical impact, vibration, or environmental stress is a concern. This product is manufactured to meet the requirements of automation systems, industrial machinery, and control applications where consistent magnetic activation is important.
1L-MSR-103 – Recessed Mount Magnetic Switch
Specifications:-
- 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
Recessed Press-Fit Construction
The 1L-MSR-103 recessed reed switch features a 3/8″ (9mm) diameter press-fit body, enabling secure installation into a precisely drilled hole. Once inserted, the switch fits tightly within the mounting cavity, eliminating the need for additional brackets or surface hardware. This press-fit design not only improves installation efficiency but also ensures that the switch remains firmly positioned throughout its service life.
This construction makes the 1L-MSR-103 ideal for industrial panels, machine frames, and structural components where a clean and professional finish is required without compromising performance.
¾" Collar Flange for Superior Retention
To further enhance mechanical stability, the 1L-MSR-103 magnetic switch is equipped with a ¾” collar flange. This flange acts as a positive stop during installation and prevents the switch from sliding deeper into the mounting hole or backing out due to vibration or repeated operation.
The collar flange significantly improves retention strength, making this recessed reed switch well-suited for industrial environments where equipment experiences continuous motion, mechanical stress, or frequent actuation.
Reliable Operating Gap for Accurate Detection
The 1L-MSR-103 electrical reed switch is designed with a minimum operating gap of 5/8″ (16mm). This operating distance allows dependable switching when used with the appropriate magnet, ensuring accurate position detection without false triggering.
The defined operating gap supports stable sensing performance in industrial automation systems where consistent alignment and repeatable actuation are critical to system reliability.
Extended 18" Wire Leads for Easy Wiring
For flexible system integration, the 1L-MSR-103 recessed mount magnetic switch is supplied with 18-inch long wire leads. These extended leads simplify wiring inside control panels, electrical cabinets, and machinery enclosures, reducing installation time and minimizing the need for additional connectors or splicing.
This feature makes the 1L-MSR-103 particularly suitable for industrial setups where routing space and wiring accessibility can vary from one installation to another.
Industrial-Grade Performance
Manufactured by 1 LEAP Technologies, a trusted Reed Sensor Manufacturer, the 1L-MSR-103 is built to deliver stable performance in demanding industrial conditions. The internal reed element is carefully selected and assembled to ensure reliable magnetic switching, long operational life, and consistent response over repeated cycles.
This model is intended for fixed installations and industrial automation systems and is not designed for compact consumer electronics or portable devices.
Key Features of 1L-MSR-103
- Recessed mount magnetic switch for industrial use
- 3/8″ (9mm) diameter press-fit body
- Minimum operating gap of 5/8″ (16mm)
- 18″ long wire leads for flexible wiring
- ¾” collar flange for improved retention and stability
- Flush installation for mechanical protection
- Manufactured by 1 LEAP Technologies
Applications of 1L-MSR-103
The 1L-MSR-103 magnetic switch is designed exclusively for applications where recessed mounting and mechanical robustness are required. Common use cases include:
- Industrial machinery position sensing
- Automation and process control equipment
- Safety interlock systems
- Electrical and control panel door monitoring
- Machine enclosure and access cover detection
- Factory automation systems
All applications are focused on industrial and automation environments where this recessed reed switch provides reliable and repeatable magnetic sensing.
Bulk Supply and Industrial Sourcing
1 LEAP Technologies supports OEMs, system integrators, and distributors as a reliable bulk supplier and one of the trusted industrial reed switch suppliers. The 1L-MSR-103 is available for bulk procurement to meet large-scale industrial project requirements.
Customers looking to purchase a reed switch online can access complete technical specifications, drawings, and ordering information directly from our official product page.
Why Choose 1L-MSR-103 from 1 LEAP Technologies
Choosing the 1L-MSR-103 recessed mount magnetic switch means investing in a product that is engineered for durability, accuracy, and ease of installation. Backed by the manufacturing expertise of 1 LEAP Technologies, this model offers dependable performance for industrial sensing needs where quality and consistency matter.
As an experienced Reed Sensor Manufacturer, we focus on delivering solutions that meet real-world industrial requirements, making the 1L-MSR-103 a trusted choice for automation and control applications.
Conclusion
The 1L-MSR-103 Recessed Mount Magnetic Switch is the best choice for professionals who are searching for the accuracy, durability, and flexibility. With its strong magnetic response, high-quality reed switch mechanism, and availability in both normally open reed switches and normally closed reed switch versions, it serves as a dependable solution for any security or automation project.
