The **AD3V-S2B-R3** is a specific variant of a subminiature microswitch, commonly used in industrial control panels, automotive electronics, and household appliances. It is designed to provide high reliability in a compact form factor. --- ## 1. Technical Specifications Below is a breakdown of the typical electronic and mechanical characteristics for this component series: | Parameter | Specification | |:---|:---| | **Switch Type** | Subminiature Microswitch (Snap-Action) | | **Actuator Type** | Simulated Roller Lever | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Contact Material** | Silver Alloy / Gold Plated (depending on load) | | **Current Rating** | Typically 3A to 5A at 125/250VAC | | **Operating Force** | ~50g to 150g (Model dependent) | | **Terminal Type** | Solder or PCB Terminals | | **Operating Temperature** | -25°C to +85°C | --- ## 2. Key Features and Construction ### A. Snap-Action Mechanism The "S2B" designation often refers to the internal spring mechanism. Snap-action switches use a "dead-break" mechanism where the speed of the contact movement is independent of the speed of the actuator. This ensures a clean electrical break and reduces arcing. ### B. Contact Configuration (SPDT) The switch features three pins: 1. **COM (Common):** The input terminal. 2. **NC (Normally Closed):** Connected to COM when the lever is at rest. 3. **NO (Normally Open):** Connected to COM only when the lever is pressed. ### C. Actuator Design The **R3** suffix typically denotes the **Simulated Roller Lever**. Unlike a standard straight lever, the curved tip mimics a roller, allowing for smoother interaction with cams or sliding mechanical parts without the bulk of a physical wheel. --- ## 3. Terminal Wiring Diagram ```markdown [ Lever / Actuator ] | _________|_________ | | | (Switch) | |___________________| | | | (NC) (COM) (NO) ``` --- ## 4. Common Applications * **Door Interlocks:** Detecting if a microwave or printer door is closed. * **Limit Switching:** Detecting the end-of-travel for a motor-driven slide. * **Safety Sensors:** Used in industrial equipment to trigger an emergency stop if a panel is removed.