The **WJM-115-R/Q** typically refers to a specific series of high-precision, sub-miniature **rotary switches** or **potentiometer-style selectors** often used in telecommunications, testing equipment, and industrial controls. Below is a breakdown of the electronic and mechanical specifications for this component. --- ### 1. Technical Specifications The WJM series is designed for low-power signal switching where space-saving and reliability are critical. | Feature | Specification (Typical) | | :--- | :--- | | **Component Type** | Rotary Selector Switch / Miniature Switch | | **Contact Rating** | 0.5A at 125VAC; 0.2A at 250VAC | | **Insulation Resistance** | 100MΩ Min. at 500VDC | | **Dielectric Strength** | 500VAC for 1 minute | | **Contact Resistance** | 50mΩ Max. | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Through-hole (PCB) or Panel Mount | ### 2. Suffix Meanings (R/Q) In electronic component nomenclature, suffixes often denote the specific configuration of the terminals or the physical orientation: * **R (Right Angle):** Usually indicates that the pins are bent at a 90-degree angle, allowing the component to be mounted horizontally on a PCB while the dial/knob faces the user. * **Q (Quick Connect / Silver Contacts):** Often refers to the contact material or terminal style. "Q" frequently denotes silver-plated contacts which provide excellent conductivity for power switching, whereas "G" (if present) would denote gold-plating for low-level signals. ### 3. Key Electronic Features * **Indexing Mechanisms:** These parts usually feature a "detent" mechanism, providing tactile feedback (a "click") for each position. * **Wiping Contacts:** The internal contacts are designed to "wipe" across the stationary terminals, which helps self-clean the surface from oxidation, ensuring long-term electrical stability. * **Shorting vs. Non-Shorting:** * *Make-before-break:* The next contact connects before the current one disconnects. * *Break-before-make:* The current contact disconnects before the next one connects. (The WJM series typically defaults to Break-before-make). --- ### 4. Typical Applications Due to its small footprint and reliable switching, it is commonly found in: 1. **Multimeters:** For range selection. 2. **Audio Equipment:** For input channel selection or gain stepping. 3. **Medical Devices:** Compact user interface controls. 4. **Communication Radios:** Channel selection.