The **V-4C20-R** is a specific electronic component belonging to the **Subminiature Microswitch** category, typically manufactured by **Omron** (part of their V-series). These switches are widely used for detecting position, presence, or providing manual human-machine interface (HMI) control. --- ### 1. Technical Specifications The model number "V-4C20-R" defines its physical and electrical characteristics. Below is a breakdown of its technical profile: | Feature | Specification | | :--- | :--- | | **Switch Type** | Snap-Action Microswitch | | **Actuator Style** | Simulated Roller Lever (typically) | | **Contact Form** | SPDT (Single Pole Double Throw) | | **Current Rating** | 4 Amps at 250 VAC | | **Operating Force** | Low to Medium (approx. 0.49 to 1.23 N) | | **Termination Style** | Solder or Quick Connect terminals | | **Ingress Protection** | Basic (Not waterproof unless specified) | --- ### 2. Nomenclature Breakdown To understand the "V-4C20-R" part number, we can look at the Omron naming convention: * **V**: Denotes the series (Basic Snap Action Switch). * **4**: Indicates the electrical rating (4 Amps). * **C**: Refers to the contact gap/insulation or terminal type (standardly 0.5mm). * **20**: Refers to the actuator type. In this series, "20" often corresponds to a **Simulated Roller Lever**. * **R**: Usually indicates the direction or specific mounting orientation (Right-hand or standard). --- ### 3. Key Electronic Characteristics #### Snap-Action Mechanism The "Snap-Action" means that the speed at which the contacts move is independent of the speed at which the actuator is pressed. This ensures reliable switching even when the physical movement is very slow, preventing "arcing" (sparks) that would otherwise damage the contacts. #### Contact Configuration (SPDT) The device features three terminals: 1. **COM (Common):** The input power/signal. 2. **NC (Normally Closed):** Connected to COM when the lever is released. 3. **NO (Normally Open):** Connected to COM only when the lever is pressed. --- ### 4. Common Applications Due to its reliability and small footprint, this part is found in: * **Home Appliances:** Door interlocks for microwave ovens or washing machines. * **Industrial Automation:** Limit switches to detect the end-of-travel for a motor. * **Vending Machines:** Detecting the dispensing of a product. * **Office Equipment:** Paper jam detection in printers and photocopiers. ---