The **YB2-16CWCKS1** is a specific part number for a high-quality **Illuminated Pushbutton Switch** manufactured by **NKK Switches**. It belongs to the YB2 Series, which is known for its tamper-resistant design and space-saving characteristics. ### 1. Part Number Breakdown To understand the electronics and mechanics of this component, we can deconstruct the part number: | Segment | Code | Description | | :--- | :--- | :--- | | **Series** | YB2 | Short body, 24mm diameter pushbutton series | | **Poles** | 16 | SPDT (Single Pole Double Throw) | | **Circuit** | CW | On-(On) / Momentary Action (Spring back) | | **Terminal** | CK | Solder Lug / Quick Connect terminals | | **Bushing** | S | Silver Contacts | | **Shape/Cap** | 1 | Round with flat cap | --- ### 2. Technical Specifications The following table outlines the electrical and physical parameters of the switch: | Parameter | Rating / Specification | | :--- | :--- | | **Electrical Capacity** | 5A @ 125V AC; 3A @ 250V AC; 3A @ 30V DC | | **Contact Resistance** | 50 milliohms maximum | | **Insulation Resistance** | 200 megohms minimum @ 500V DC | | **Dielectric Strength** | 1,000V AC minimum between contacts | | **Mechanical Life** | 1,000,000 operations minimum | | **Electrical Life** | 100,000 operations minimum | | **Operating Temp** | -25°C to +50°C (with LED) | --- ### 3. Key Electronic & Mechanical Features #### A. SPDT Circuitry The "16" in the part number indicates a Single Pole Double Throw configuration. This means the switch has one common terminal and two output terminals (Normally Open and Normally Closed). It can be used to toggle power between two different circuits or simply as a standard On/Off switch. #### B. Momentary Action The "CW" designation indicates **Momentary** operation. The switch only stays in the "actuated" position while your finger is pressing it; it returns to its original state immediately upon release. #### C. Illumination The "C" in the suffix usually denotes a **Red LED** illumination. * **Voltage:** LEDs in this series typically require a specific forward voltage (often 2V to 12V depending on internal resistors). * **Protection:** The LED is isolated from the main switching circuit, allowing you to wire the light to stay on constantly or flash only when the button is pressed. #### D. Short Body Design The YB2 series is famous for its "short body." It requires very little depth behind the panel (approximately 24.5mm), making it ideal for compact electronic enclosures or handheld devices. --- ### 4. Common Applications * **Industrial Control Panels:** Where space is limited. * **Medical Equipment:** Due to the reliable tactile feedback and high-quality build. * **Audio/Video Switchers:** Used as "trigger" buttons for transitions. * **Automotive/Marine Dashboards:** Specifically in custom hobbyist builds.