The **YB2-15CWCPG4** is a high-quality, professional-grade pushbutton switch manufactured by **NKK Switches**. It belongs to the YB2 series, which is known for its tamper-resistant design and low-profile aesthetics. --- ### 1. Technical Specifications The part number can be broken down into specific technical attributes: | Parameter | Specification | |:---|:---| | **Series** | YB2 Series (Tamper Resistant) | | **Circuit** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-(ON) / Momentary (Springs back when released) | | **Rating (Silver)** | 3A @ 125V AC or 3A @ 250V AC | | **Rating (Gold)** | 0.4VA max @ 28V AC/DC max | | **Illumination** | Green LED | | **Cap Style/Color** | Round, Clear Cap with Green Filter | | **Housing Material** | Glass fiber reinforced polyamide | --- ### 2. Internal Electronic Components #### A. Contact Mechanism * **Dual Rating:** This specific model often features "Universal" contacts (Gold over Silver). This allows the switch to be used for high-power applications (up to 3A) or low-level logic circuits without oxidation issues. * **Action:** It uses a snap-action mechanism that provides tactile feedback and ensures a quick, clean break of the electrical connection to prevent arcing. #### B. LED Illumination * **Type:** Integrated Green LED. * **Polarity:** The terminals are marked (+) and (-) for the LED. * **Requirements:** As a discrete LED component, it typically requires an external current-limiting resistor if your supply voltage exceeds ~2.1V DC. #### C. Terminals * **PC Terminals:** The "PG" suffix indicates straight PC (Printed Circuit) terminals. These are designed for mounting directly onto a PCB (Printed Circuit Board) rather than using hand-soldered wires. --- ### 3. Physical & Environmental Features * **Tamper Resistance:** The flanged design and low profile (only 1.8mm above the panel) prevent the switch from being easily pried off or damaged. * **IP Rating:** When used with the appropriate gasket, it provides a degree of protection against dust and splashing water (IP65 equivalent at the front panel). * **Mounting:** Designed for a 16mm diameter panel cutout. --- ### 4. Circuit Diagram Representation To integrate this into a schematic, the pinout follows this logic: ```text Pin 1 & 3: Normally Closed (NC) Pin 1 & 2: Normally Open (NO) Pin L (+) & L (-): LED Anode and Cathode ```