The **1222-R** refers to a specific series of rotary switches, most commonly associated with manufacturers like **Lorlin** or **Grayhill**. These components are electromechanical switches used to select different electrical paths by rotating a central shaft. --- ### 1. Key Technical Specifications The "1222-R" designation usually implies a specific configuration regarding the number of poles and positions. | Feature | Typical Specification | | :--- | :--- | | **Switch Type** | Rotary | | **Poles** | 1 Pole (Standard) | | **Positions** | Up to 12 Positions | | **Contact Rating** | 150mA @ 250V AC/DC | | **Mounting Type** | PCB Mount or Panel Mount | | **Indexing Angle** | 30° between positions | | **Termination** | Solder Pins / PC Terminals | ### 2. Physical Construction The 1222-R series is designed for durability and precision. The parts generally consist of: * **Actuator (Shaft):** Usually made of high-quality plastic or metal (D-shape or splined). * **Housing:** Glass-filled Nylon or Polyester for high insulation resistance. * **Contacts:** Silver-plated brass (standard) or Gold-plated (for low-level switching). * **Stop Pins:** Many versions allow the user to set a "stop" to limit the number of positions (e.g., turning a 12-position switch into a 4-position switch). ### 3. Common Applications These parts are widely used in industrial and consumer electronics where multiple settings are required: 1. **Audio Equipment:** Input selectors for amplifiers or channel switching. 2. **Test Instruments:** Range selection on multimeters or oscilloscopes. 3. **Industrial Controls:** Mode selection for heavy machinery. 4. **Lighting:** Dimmer steps or sequence controllers. ### 4. Circuit Diagram Representation In a schematic, a 1-pole 12-position switch like the 1222-R is represented by a single "Common" (C) terminal and 12 output terminals. ```text (C) --- Common Pin | [1][2][3][4] ... [12] --- Output Pins ``` ---