The **YB2-15CWCKS1** 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, low-profile design and durability. Below is a detailed breakdown of its electronic and mechanical parts. --- ## 1. Core Specifications Table | Feature | Specification | | :--- | :--- | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Switch Function** | ON-(ON) / Momentary (Springs back when released) | | **Current Rating** | 5A @ 125V AC; 3A @ 250V AC; 3A @ 30V DC | | **Contact Material** | Silver Alloy (Standard) | | **Illumination** | Non-Illuminated (in this specific configuration) | | **Mounting Type** | Panel Mount, Threaded (16mm hole) | | **Termination Style** | Solder Lug / Quick Connect | --- ## 2. Key Electronic & Structural Components ### A. Contact Mechanism (SPDT) The internal circuit is a **Single Pole Double Throw**. This means there is one common terminal that switches between two other terminals. Since it is **Momentary**, the connection rests in one state and only switches to the other while the button is physically held down. ### B. The Bezel and Housing * **Tamper Resistance:** The YB2 series features a very low profile (1.8mm above the panel). This makes it difficult to pry or damage the switch from the front. * **Material:** The housing is typically made of **Glass Fiber Reinforced Polyamide**, providing high dielectric strength and heat resistance. ### C. Sealing and Protection * **IP Rating:** This part is **IP65 rated** (front panel). It utilizes an internal o-ring and a polyethylene gasket to protect the internal electronics from dust and water splashes. * **Flammability:** The base materials meet **UL94V-0** standards, ensuring the plastic parts do not support combustion. ### D. Terminals The terminals are **Solder Lugs**, which are epoxy sealed. This seal prevents flux, solvents, or other contaminants from entering the switch chamber during the soldering process, ensuring the integrity of the electrical connection. --- ## 3. Dimensional Data | Part | Dimension | | :--- | :--- | | **Panel Cutout** | 16.0mm (.630") diameter | | **Body Depth** | ~24.5mm behind the panel | | **Cap Type** | Round, Flush Mount | --- ## 4. Part Number Breakdown * **YB2:** Series Code (16mm Tamper Resistant) * **15:** Circuit Code (SPDT, Momentary) * **CW:** Sealing (Panel Seal, IP65) * **CK:** Contact Material (Silver) * **S1:** Cap/Bezel Type (Silver/Metallic finish style)