The **M2RT-44-R** is a high-performance, precision rotary switch manufactured by **NKK Switches**. It belongs to the **M2 series** of miniature rotary switches, designed for high-density mounting on Printed Circuit Boards (PCBs). --- ### 1. Key Technical Specifications The following table outlines the core electronic and mechanical parameters of the M2RT-44-R: | Feature | Specification | | :--- | :--- | | **Circuitry** | DP4T (Double Pole, 4 Throw) | | **Number of Positions** | 4 Positions | | **Contact Rating** | 0.2VA max @ 28V AC/DC (Logic Level) | | **Actuator Type** | Screwdriver Slotted (Flush) | | **Mounting Type** | Through-hole, Right Angle | | **Contact Material** | Gold-plated Brass/Copper | | **Operating Temperature**| -25°C to +85°C | --- ### 2. Functional Characteristics #### A. Logic Level Application This switch is specifically designed for **logic-level circuits**. The gold-plated contacts ensure high reliability when switching low voltages and currents, preventing the oxidation that typically affects silver contacts in low-power environments. #### B. Mechanical Design * **Rotary Action:** Provides positive detent for tactile feedback, ensuring the user can feel the switch click into each of the four positions. * **Right Angle Orientation:** The "R" in the suffix indicates a right-angle mount. This is ideal for edge-of-board mounting where the user needs to adjust settings from the side of the device enclosure. * **Washable Construction:** The series typically features automated soldering compatibility and is designed to withstand cleaning processes (flux removal) due to its sealed internal mechanism. #### C. Termination and Layout The pin spacing is designed for standard PCB grids. Because it is a **Double Pole** switch, it can control two independent circuits simultaneously across the four available positions. --- ### 3. Common Applications * **Industrial Controls:** Setting operating modes or addresses on PLCs. * **Telecommunications:** Configuration of rack-mounted networking equipment. * **Medical Equipment:** Selecting parameters on handheld diagnostic tools. * **Test & Measurement:** Channel selection or gain range adjustment on oscilloscopes and multimeters. ---