The **RS-12-R** refers to a specific series of rotary switches, most commonly associated with manufacturers like **Alpha** or **Lorlin**. These are compact, multi-position switches used to route signals or power in electronic circuits. ### 1. Key Technical Specifications The "RS-12" designation typically describes the physical diameter (approx. 12mm - 16mm) and the number of available positions. | Feature | Typical Specification | | :--- | :--- | | **Switch Type** | Rotary Switch | | **Number of Positions** | 2 to 12 Positions (Selectable) | | **Number of Poles** | 1 Pole (most common), 2, 3, or 4 Poles | | **Current Rating** | 0.3A at 125V AC / 0.5A at 16V DC | | **Contact Resistance** | < 50mΩ | | **Insulation Resistance** | 100MΩ min. at 500V DC | | **Rotation Angle** | 30° per position | --- ### 2. Functional Components A standard RS-12-R switch consists of several critical electronic and mechanical parts: * **Rotor:** The central moving part that rotates when the shaft is turned. It carries the common contact. * **Stator:** The stationary base holding the output terminals. * **Contacts:** Usually silver-plated or gold-plated brass to ensure high conductivity and prevent oxidation. * **Detent Mechanism:** A spring-loaded ball or clip that "clicks" the switch into a specific position, preventing it from resting between circuits. * **Stopper:** A small metal pin or tab used to limit the number of positions (e.g., turning a 12-position switch into a 3-position switch). --- ### 3. Pinout Configuration (Example) For a **1-Pole, 12-Position** configuration, the pinout logic follows this structure: ```text [Pin C] ----> Common Input/Output [Pin 1] ----> Position 1 [Pin 2] ----> Position 2 ... [Pin 12] ---> Position 12 ``` In this setup, the "Common" pin is electrically connected to only one numbered pin at a time, depending on the shaft's rotation. --- ### 4. Common Applications The RS-12-R series is widely used in low-power signal switching: 1. **Audio Equipment:** Selecting between different input sources (CD, Aux, Phono). 2. **Test Instruments:** Changing scales on a multimeter or selecting waveforms on an oscilloscope. 3. **Industrial Controls:** Mode selection for machinery (Manual, Auto, Off). 4. **DIY Electronics:** Voltage dividers or channel switching in guitar pedals. --- ### 5. Part Number Suffix Meaning * **RS:** Rotary Switch series. * **12:** Refers to the maximum positions (12) or the body diameter (12.6mm). * **R:** Often indicates **RoHS Compliance** (Restriction of Hazardous Substances) or a specific **Right-Angle** mounting style depending on the specific manufacturer's datasheet.