The term **"26-R2"** most commonly refers to a specific type of **Rotary Switch** or a specific **Potentiometer** series used in industrial and radio-frequency equipment. Below is a breakdown of the typical electronic specifications and components associated with the 26-R2 series, particularly focusing on the rotary switch architecture. ### 1. Component Overview The 26-R2 is generally a heavy-duty, multi-deck rotary switch designed for high reliability. | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Selector Switch | | **Number of Positions** | Typically 2 to 12 positions | | **Number of Decks** | 1 or 2 (indicated by R2) | | **Mounting Type** | Panel Mount | | **Contact Material** | Silver-plated or Gold-plated Brass | | **Termination** | Solder Lugs | --- ### 2. Key Electronic Parts & Construction The internal assembly of a 26-R2 switch consists of several critical layers: * **Rotor (The "R"):** The moving part that connects the common terminal to specific output terminals. In "R2" models, this often signifies a **dual-rotor** or **2-pole** configuration. * **Stator (Wafer):** The stationary ceramic or diallyl phthalate disk that holds the contact lugs. * **Indexing Mechanism:** A spring-loaded ball bearing system that provides the "click" feel and ensures the switch stays in the selected position. * **Contact Wipers:** Small metal arms that maintain electrical continuity. In high-quality versions, these are "self-cleaning" to remove oxidation during every turn. --- ### 3. Technical Ratings When integrating a 26-R2 part into a circuit, the following electrical limits are standard: | Parameter | Typical Value | | :--- | :--- | | **Voltage Rating** | 125V AC / 28V DC | | **Current Rating** | 0.5A to 2A (Load dependent) | | **Contact Resistance** | < 20 mΩ | | **Insulation Resistance** | > 1000 MΩ | | **Dielectric Strength** | 1000V RMS at sea level | --- ### 4. Common Applications These parts are rarely found in consumer electronics today but are staples in: 1. **Test Equipment:** Oscilloscopes and signal generators for range selection. 2. **Audio Gear:** Vintage amplifiers or high-end step attenuators. 3. **Industrial Controls:** Heavy machinery mode selection where physical feedback is required. 4. **Avionics:** Cockpit instrumentation requiring high vibration resistance. --- ### 5. Identification Code Breakdown If you are looking at a specific part number like `26-R2-XX`, the suffix usually denotes: * **26:** The frame size or series family. * **R2:** 2-Pole (or 2-Deck) configuration. * **XX:** The specific number of positions (e.g., -10 would be a 10-position switch).