The **YB216CWCKG01-5F-JS** is a high-quality, illuminated push-button switch manufactured by **NKK Switches**. It belongs to the YB series, specifically designed for panel-mount applications requiring environmental sealing and aesthetic appeal. --- ### 1. Technical Specifications Breakdown The part number provides specific details about the electrical and physical construction of the switch: | Parameter | Specification | | :--- | :--- | | **Series** | YB Series (Standard size) | | **Circuit / Poles** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-ON (Latching/Maintained) | | **Contact Rating** | 0.4VA Max @ 28V AC/DC (Logic Level) | | **Illumination** | Green LED (5F) | | **Cap Type/Color** | Round, Clear Cap with Yellow Insert (JS) | | **Bushing** | 16mm Diameter (Threaded) | | **Sealing** | IP65 Rated (Dust-tight and water jet protected) | --- ### 2. Key Electronic Components #### A. Contact Mechanism (Gold Plated) The "G" in the part number indicates **Gold contacts**. Unlike silver contacts, gold does not oxidize, making it ideal for "Logic Level" applications where the voltage and current are very low (under 100mA). It ensures high reliability for digital signal switching. #### B. Illumination (LED) * **Voltage:** Typically requires a series resistor if the power source exceeds the LED forward voltage (usually around 2.1V to 3.5V depending on the specific green LED used). * **Configuration:** The LED is integrated into the switch body but operates on a separate circuit from the switch contacts. #### C. Latching Action (Maintained) This is an **ON-ON** switch. When pressed, it stays in the depressed position (and the circuit changes state) until pressed again to release it. --- ### 3. Physical & Environmental Construction 1. **Terminals:** Usually 0.110" (2.8mm) quick-connect or solder lug terminals. 2. **Panel Seal:** Includes an O-ring to ensure the IP65 rating is met when mounted on a flat panel. 3. **Housing Material:** Made of heat-resistant resin, meeting UL94V-0 flammability standards. --- ### 4. Wiring Diagram (SPDT) ```text Terminal 1 (NC) ----| |---- Terminal 2 (Common) Terminal 3 (NO) ----| L (+) ----[ LED ]---- L (-) ``` * **Common (2):** The input signal. * **NC (1):** Normally Closed (connected to Common when the button is UP). * **NO (3):** Normally Open (connected to Common when the button is DOWN).