The **WRS-12B-R** is a specific model of a **Miniature Rotary Switch**. These components are widely used in electronic circuits to select different operating modes or to route signals between multiple paths using a physical rotating knob. --- ## 1. Technical Specifications Below are the typical electronic and physical specifications for the WRS-12B-R series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Rotary Switch | | **Number of Positions** | 2 to 12 (Selectable) | | **Number of Poles** | 1 Pole | | **Current Rating** | 0.3A at 125V AC / 0.5A at 24V DC | | **Contact Resistance** | < 50mΩ | | **Insulation Resistance** | > 100MΩ at 500V DC | | **Dielectric Strength** | 500V AC for 1 minute | | **Mounting Type** | PCB Mount (Through-Hole) or Panel Mount | --- ## 2. Key Electronic Features ### A. Make-Before-Break vs. Break-Before-Make The WRS-12B-R is typically a **Non-Shorting (Break-Before-Make)** switch. - This means the connection to the current position is broken *before* the connection to the next position is established. - This prevents momentary short-circuiting between two output channels. ### B. Adjustable Stops One of the most important mechanical-electronic features of the "12B" series is the **adjustable stop ring**. Although it has 12 physical terminal slots, you can move a metal washer to limit the rotation to fewer positions (e.g., a 3-position switch or a 5-position switch). ### C. Contact Material The contacts are usually **Silver-Plated Brass**. Silver provides excellent conductivity and low contact resistance, which is vital for maintaining signal integrity in audio or low-voltage control circuits. --- ## 3. Pinout and Circuit Layout The "1-Pole, 12-Position" configuration involves a central common pin and 12 output pins arranged in a circle. ```text (3) (4) (5) (2) (6) (1) (C) (7) <-- C = Common Pin (Input) (12) (8) 1-12 = Selection Pins (Output) (11)(10)(9) ``` --- ## 4. Common Applications * **Test Equipment:** Selecting voltage ranges on a multimeter. * **Audio Equipment:** Channel selection or gain stepping in amplifiers. * **Industrial Controls:** Selecting operational modes (Manual, Auto, Off). * **DIY Electronics:** Band switching in radio projects.