The term **S-H1-R** typically refers to a specific configuration or model of a **Miniature Limit Switch** or **Micro Switch**, often used in industrial automation, robotics, and safety interlocks. Below is an explanation of its electronic components and characteristics. --- ### 1. Component Overview The S-H1-R is a mechanical switch that converts physical motion into an electrical signal. It is defined by its small form factor and high precision. | Feature | Description | | :--- | :--- | | **Contact Configuration** | Usually SPDT (Single Pole Double Throw) | | **Actuator Type** | Roller Lever (indicated by the "R" in the suffix) | | **Housing Material** | Heat-resistant Phenolic or Thermoplastic | | **Termination** | Solder terminals or Screw terminals (model dependent) | --- ### 2. Internal Electronic Parts Internally, the switch consists of several critical conductive and mechanical parts: * **Moving Blade:** A spring-loaded copper or brass strip that snaps between contacts. * **Stationary Contacts:** Typically made of **Silver Alloy** to ensure high conductivity and resistance to oxidation (arcing). * **Plunger:** The internal pin that transmits the external force to the moving blade. * **Return Spring:** Ensures the switch returns to its "Normal" state once the physical pressure is removed. --- ### 3. Electrical Specifications Standard ratings for this class of switch are designed to handle both logic-level signals and power loads. | Parameter | Typical Value | | :--- | :--- | | **Voltage Rating (AC)** | 125V / 250V AC | | **Current Rating** | 5A to 10A | | **Contact Resistance** | < 15 mΩ (Initial) | | **Insulation Resistance** | > 100 MΩ (at 500V DC) | | **Dielectric Strength** | 1,000V AC for 1 minute | --- ### 4. Wiring Diagram (SPDT) The switch operates using three primary terminals: ```text COM (Common) --------+ | +---- NC (Normally Closed) -> Circuit ON by default | +---- NO (Normally Open) -> Circuit ON when pressed ``` ### 5. Application of the "R" (Roller) The "R" indicates a **Roller Lever**. This electronic part is crucial because it reduces friction on the actuator. It allows the switch to be triggered by a cam or a sliding object without wearing down the switch arm, making it ideal for conveyor belts or CNC axis homing. ---