The **M2SBS-21D-R/N** is a specialized electronic component, typically categorized as a **Limit Switch** or a **Micro Switch** often found in industrial automation, elevator systems, or safety-critical machinery. Below is a breakdown of its technical specifications and electronic characteristics. ### 1. General Specifications | Feature | Details | | :--- | :--- | | **Component Type** | Snap-action Limit Switch / Micro Switch | | **Contact Configuration** | 1NO (Normally Open) + 1NC (Normally Closed) | | **Actuator Type** | Roller Plunger / Lever (depending on the specific series mount) | | **Terminal Type** | Screw Terminals or Solder (model dependent) | --- ### 2. Electrical Characteristics These parts are designed to handle high-voltage industrial circuits. The "21D" designation typically refers to its contact rating and internal mechanism design. * **Voltage Rating:** Usually rated for **250V AC** or **125V DC**. * **Current Rating:** Typically supports up to **10A to 15A** (Inductive or Resistive load). * **Contact Resistance:** Low initial resistance (usually < 50mΩ) to ensure signal integrity in control circuits. * **Insulation Resistance:** Minimum 100MΩ at 500V DC. --- ### 3. Physical & Mechanical Properties The construction of the M2SBS-21D-R/N focuses on durability and environmental protection. * **Housing:** High-strength reinforced plastic or die-cast metal housing to resist physical impact. * **Operating Force (OF):** High precision force requirement to trigger the "Snap-action" mechanism. * **Durability:** * *Mechanical Life:* ~10 million operations. * *Electrical Life:* ~500,000 operations at full load. * **IP Rating:** Generally rated around **IP40 to IP67** (depending on the specific enclosure/seal version) to protect against dust and moisture. --- ### 4. Part Number Breakdown (Typical) While naming conventions vary slightly by manufacturer (e.g., Moujen or similar industrial brands), here is the standard interpretation: | Code Segment | Meaning | | :--- | :--- | | **M2SBS** | Series identifier (standard miniature or sub-miniature limit switch). | | **21** | Contact arrangement or current rating code. | | **D** | Internal plunger or spring mechanism type. | | **R/N** | Indicates the specific Actuator (R = Roller, N = Nylon or specialized material). | --- ### 5. Common Applications 1. **Safety Interlocks:** Ensuring a machine guard is closed before the machine starts. 2. **Elevator Systems:** Used for floor leveling or door position detection. 3. **Conveyor Belts:** Detecting the presence or position of items on a line. 4. **End-of-Travel Sensing:** Preventing mechanical parts from moving past their safe boundaries in CNC or 3D printing equipment.