The **KUS-03-R** is an electronic component primarily classified as a **USB Switch** or **Toggle Selector**, often used in industrial or consumer electronics for routing USB data signals or managing power between devices. --- ### 1. Technical Specifications Below is a breakdown of the typical electronic characteristics of the KUS-03-R series: | Feature | Specification | | :--- | :--- | | **Component Type** | USB Interface Selector / Switch | | **Interface Support** | USB 2.0 (High Speed) / USB 3.0 (model dependent) | | **Input Ports** | Usually 1 or 2 (A/B selection) | | **Mounting Type** | PCB Through-hole or Panel Mount | | **Voltage Rating** | 5V DC (standard USB bus voltage) | | **Contact Resistance** | < 50 mΩ | | **Insulation Resistance** | > 100 MΩ | --- ### 2. Core Electronic Functions The KUS-03-R operates based on several key electronic principles: * **Signal Multiplexing:** It acts as a physical multiplexer, allowing a single peripheral (like a mouse or keyboard) to be shared between multiple hosts, or a single host to switch between different peripherals. * **Impedance Matching:** To maintain USB data integrity, the internal traces are designed to minimize signal reflection and maintain the standard **90-ohm differential impedance**. * **Mechanical Actuation:** It uses a physical toggle or push mechanism that mechanically moves the internal conductive pins to complete a circuit, ensuring a "hard break" between connections. --- ### 3. Pinout and Circuit Layout In a standard application, the electronic layout follows this logic: ```c [Host A Data D+/D-] ----| |--- [Mechanical Switch] --- [Common USB Port] [Host B Data D+/D-] ----| ``` * **VCC (5V):** Usually passed through with a common ground. * **Data Pins (D+/D-):** Switched simultaneously to ensure the handshake between the USB host and device is not interrupted by signal lag. * **Shielding:** The outer metal casing of the KUS-03-R is connected to the PCB ground plane to reduce EMI (Electromagnetic Interference). --- ### 4. Common Applications 1. **KVM Switches:** Used in Keyboard-Video-Mouse switchers to toggle USB input. 2. **Test Equipment:** For switching between different sensors or data acquisition modules. 3. **Industrial Controls:** Selecting between different PLC (Programmable Logic Controller) programming ports.