The **18RS-36-R** is a specific model identifier typically associated with a **Compact 18mm Rotary Selector Switch** or a similar electromechanical component often used in industrial control panels or consumer electronics. Below is a detailed breakdown of the electronic and mechanical specifications for this type of component. --- ### 1. General Specifications The part number follows a standard nomenclature for rotary switches. Here is a summary of its technical profile: | Feature | Specification | | :--- | :--- | | **Diameter** | 18mm (Outer frame/body size) | | **Contact Type** | Standard Rotary (Single or Multi-pole) | | **Mounting Style** | Panel Mount / Through-hole | | **Termination** | Solder lugs or PC pins | | **Operating Voltage** | Typically 125V AC / 28V DC | | **Current Rating** | ~0.3A to 0.5A (varies by manufacturer) | --- ### 2. Internal Electronic Parts The "18RS" series generally consists of several key internal elements that manage the electrical signal: * **Rotor:** The moving part connected to the shaft. It contains the common contact point. * **Stator:** The stationary base made of an insulating material (like phenolic or diallyl phthalate) that holds the output terminals. * **Contact Wiping System:** Usually silver-plated or gold-plated brass. These ensure low contact resistance and prevent oxidation over long periods of use. * **Detent Mechanism:** A spring-loaded ball or "star wheel" inside that provides the tactile "click" and ensures the switch stops precisely at each electrical position. --- ### 3. Part Number Breakdown (Typical) While naming conventions can vary slightly between manufacturers (like Grayhill or NKK), the code usually breaks down as follows: 1. **18:** Refers to the physical diameter (18mm). 2. **RS:** Stands for **R**otary **S**witch. 3. **36:** Refers to the **Angle of Throw**. In this case, 36 degrees. * *Calculation:* 360° / 36° = **10 possible positions**. 4. **R:** Often denotes **RoHS Compliant** or a specific **Shaft/Seal** style (e.g., Rounded or Rubber-sealed). --- ### 4. Common Applications Due to its small footprint and reliable detent, the 18RS-36-R is found in: * **Test Equipment:** Selecting between different measurement ranges (Volts, Amps, Ohms). * **Audio Interfaces:** Selecting input sources or gain stages. * **Medical Devices:** Mode selection for portable diagnostic tools. * **Industrial Controls:** Setting timer values or operation modes. --- ### 5. Wiring Diagram Concept In a 36-degree throw configuration, the wiring usually looks like this in a circuit: ```text [Terminal 1] --- 36° / [COM] --- [Terminal 2] --- 72° \ [Terminal 3] --- 108° ... (up to 10 positions) ```