1L-MSM-113 Surface Mount Magnetic Reed Switch
Datasheet & Application Guide:
High-Reliability Magnetic Sensing Solution by 1 LEAP Technologies
The 1L-MSM-113 Surface Mount Magnetic Reed Switch by 1 LEAP Technologies is a specially custom magnetic sensing device designed for controlled, low-voltage DC switching applications. This model falls under the Surface Mount Magnetic Reed Switch category and is made to provide consistent performance in security, automation, and industrial monitoring systems where stable magnetic activation and electrical reliability are important.
Unlike generic magnetic reed switches, the 1L-MSM-113 is developed with a clearly defined electrical and mechanical operating range, makes sure the dependable switching behavior without compromising contact life or system safety. The product is available in both Normally Open (NO) and Normally Closed (NC) configurations, allowing flexibility in system design based on application logic.

Varients of 1L-MSM-113:
1L-MSM-113 NC
1L-MSM-113 NO
1L-MSM-117
Varients of 1L-MSM-113
Switch Type (1L-MSM-113) | NO |
|---|---|
Voltage | 200 VDC |
Current | 0.5 A |
Power | 10 W |
Operating Gap (min.) | 15 |
Dimensions (LxWxH) | 28 x 12.5 x 6.8 |
Wire Type | PVC |
* Wire Length (std.) | 18" |
Core Size | 14/38 ATC |
Operating Temp. | -20°C to +70°C |
Storage Temp. | -40°C to +85°C |
Humidity | Up to 95% non-condensing |
Housing Material | ABS Plastic |
Mounting Type | Flange Mount - Easy Screw & Adhesive tapes (optional) |
Mechanical Life | Over 10 million cycles |
Contact Resistance | 0.1 Ω |
Housing Colour | White |
Wire Colour | White |

Switch Type (1L-MSM-113) | NC |
|---|---|
Voltage | 60 VDC |
Current | 0.25 A |
Power | 4 W |
Operating Gap (min.) | 10 |
Dimensions (LxWxH) | 28 x 12.5 x 6.8 |
Wire Type | PVC |
* Wire Length (std.) | 18" |
Core Size | 14/38 ATC |
Operating Temp. | -20°C to +70°C |
Storage Temp. | -40°C to +85°C |
Humidity | Up to 95% non-condensing |
Housing Material | ABS Plastic |
Mounting Type | Flange Mount - Easy Screw & Adhesive tapes (optional) |
Mechanical Life | Over 10 million cycles |
Contact Resistance | 115 mΩ |
Housing Colour | White |
Wire Colour | Black |

Product Variants: Normally Open (NO) and Normally Closed (NC)
The Normally Open (NO) version of the 1L-MSM-113 remains electrically open when no magnetic is present. When the paired magnet approaches the sensing zone, the internal reed contact closes and completes the circuit. This configuration is hugely chosen in detection systems where the signal should activate only when a door, panel, or enclosure reaches a specific position.
The Normally Closed (NC) variant operates in the opposite manner. In this configuration, the reed contact remains closed under normal conditions and opens when the magnetic field is applied. This version is often selected for security and monitoring systems where a circuit interruption is used as a warning or fault signal. Both versions are mechanically identical and differ only in internal contact behavior.
Surface Mount Design and Mechanical Construction
The 1L-MSM-113 Magnetic Reed Sensor features a compact and hard surface-mount housing designed for easy installation on flat surfaces such as doors, frames, cabinets, and equipment enclosures. The enclosure protects the internal reed contact switch from dust, moisture, and mechanical stress, making sure stable performance even in demanding environments.
The switch and magnet alignment is optimized for consistent activation distance, which helps maintain exact sensing over long periods. Supplied mounting screws allow secure fixing, reducing the risk of misalignment during regular use.
Why Only 200 VDC? Rating Explained
One of the most important electrical characteristics of the 1L-MSM-113 is its maximum rated switching voltage of 200 VDC. This specification is not arbitrary; it is carefully defined based on the internal reed structure, contact material, and insulation design of this specific model.
The reed contacts inside the switch are hermetically sealed in a glass capsule filled with inert gas. While this construction provides excellent protection against oxidation and contamination, the physical contact gap and plating thickness are optimized for low-to-medium DC voltage levels. Operating above 200 VDC increases the possibility of electrical arcing during switching, which can shorten contact life and affect switching reliability.
By limiting the voltage rating to 200 VDC, the 1L-MSM-113 making sure controlled electrical stress on the reed blades, stable switching behavior, and long operational life. This makes the product ideal for sensing, signaling, and control circuits, but unsuitable for high-voltage or compact electronic devices such as laptops, where different sensor technologies are required.
Switching Type and Circuit Compatibility
The 1L-MSM-113 is firstly designed as an SPST Reed Switch (Single Pull Single Throw), providing simple and reliable ON/OFF switching controlled by a magnetic field. This controlled switching capability makes the product a dependable magnetic reed switch for systems that require exact and repeatable state detection rather than high-speed or high-frequency operation.
Application-Specific Use Cases of 1L-MSM-113
The 1L-MSM-113 door reed switch magnet assembly is designed specifically for applications that operate safely within its electrical and mechanical limits. It is commonly used in door and window monitoring systems, industrial cabinet sensing, security alarm panels, access-control units, and automation enclosures.
It is also hugely deployed in factory equipment monitoring, elevator door sensing, and electrical control panels where a reed contact switch provides a simple yet highly reliable method of detecting physical movement or position.
Because of its defined voltage rating and physical size, this model is not intended for miniature consumer electronics or high-density computing devices. Its strength lies in stability, durability, and predictable performance in real-world industrial and commercial environments.
Reliability and Performance Characteristics
The hermetically sealed construction of the 1L-MSM-113 Magnetic Reed Sensor making sure the minimal contact wear and consistent electrical characteristics over millions of operations. The sealed contact design prevents oxidation and contamination, resulting in stable resistance values and reduced maintenance requirements.
This reliability makes the switch especially suitable for long-term installations where frequent access or replacement is not practical.
Why Choose 1L-MSM-113 from 1 LEAP Technologies
Choosing the 1L-MSM-113 means choosing a product engineered with clear performance boundaries and application focus. 1 LEAP Technologies manufactures this model with strict quality controls to ensure that every unit meets its specified voltage, switching, and mechanical standards.
For customers looking to buy reed switch solutions that provide dependable magnetic sensing without unnecessary complexity, the 1L-MSM-113 Surface Mount Magnetic Reed Switch stands out as a proven and application-specific choice
Frequently Asked Questions (FAQs)
If the magnet–sensor alignment of the Surface Mount Magnetic 113 becomes slightly loose, does the performance drop?0020
The Surface Mount Magnetic 113 Reed Switch is customized with built-in alignment tolerance to maintain stable performance. Even if regular door usage causes a minor shift of about 1–2 mm, the switch continues to provide an accurate open/close detection without false triggering. This makes it highly reliable for environments where doors are frequently slammed, such as retail shelves, warehouse cabinets, and service panels.
How do I check if my flange-mount magnetic switch is aligned correctly for optimal performance?
Proper alignment can be checked by ensuring the actuator magnet and the switch body are parallel and within the recommended sensing distance. If the device frequently triggers incorrectly, it usually indicates misalignment or mounting surface irregularity. A quick test with a multimeter can also confirm accurate switching.
