The **M2MS-1-R/N** belongs to the **M2MS series** of sub-miniature magnetic switches, typically manufactured by companies like **PIC GmbH**. These sensors are used to detect the presence or absence of a magnetic field (proximity sensing) without physical contact. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Type** | Reed Switch (Form A - Normally Open) | | **Housing Material** | Plastic (Sub-miniature) | | **Contact Rating** | 10 W / 10 VA | | **Switching Voltage** | Max. 200 VDC / 140 VAC | | **Switching Current** | Max. 0.5 A | | **Sensitivity Range** | 10 to 20 AT (Ampere Turns) | | **Termination** | Solder Pins (PCB Mount) | --- ### 2. Physical Construction and Working Principle The M2MS-1-R/N consists of two metallic reeds encased in a hermetically sealed glass envelope, which is then protected by a **rectangular plastic housing**. * **Operation:** When a permanent magnet or electromagnet comes within the detection range, the magnetic force pulls the two internal reeds together. * **Circuit State:** This closes the electrical circuit. When the magnet is removed, the reeds spring back to their original position, opening the circuit. * **Durability:** Because the contacts are sealed in an inert gas environment, they are protected from oxidation and corrosion, ensuring millions of switching cycles. --- ### 3. Decoding the Part Number The nomenclature generally follows this logic: * **M2MS:** The Series (Miniature Magnetic Sensor). * **1:** Denotes the physical size or specific contact configuration (Form A). * **R:** Usually indicates "Rectangular" housing or "RoHS" compliance. * **N:** Often indicates the sensitivity class (Normal) or a specific lead finish. --- ### 4. Common Applications Due to its small footprint and reliability, this part is used in: 1. **Safety Interlocks:** Detecting if a door or panel is closed on consumer electronics. 2. **Liquid Level Sensing:** Mounted on a PCB and triggered by a magnetic float. 3. **Industrial Automation:** Limit switching and position detection in compact machinery. 4. **Security Systems:** Window and door sensors. --- ### 5. Wiring Diagram (Logical) ```text [ Magnetic Field ] ---> [ M2MS-1-R/N ] | +----------------|----------------+ | (Internal Reed) | Pin 1 --o / o-- Pin 2 / (Closes when magnetic) ```