The **M2RT-6B-R2** is a specific model within the **M2RT Series** of miniature rotary switches, typically manufactured by companies like **NKK Switches**. These components are designed for PCB mounting and offer high reliability in logic-level applications. --- ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the M2RT-6B-R2: | Feature | Specification | | :--- | :--- | | **Switch Type** | Rotary | | **Number of Positions** | 2 Positions | | **Actuator Type** | Screwdriver Actuated (Flatted Shaft) | | **Terminal Type** | PC Pin (Through-Hole) | | **Contact Rating** | 0.4VA Max @ 28V AC/DC (Logic Level) | | **Contact Resistance** | 50 milliohms maximum | | **Insulation Resistance** | 500 Megohms minimum @ 500V DC | | **Operating Temp** | -25°C to +85°C | --- ### 2. Key Electronic Components & Materials The reliability of this part is driven by its internal construction: * **Contacts:** Usually gold-plated over nickel. Gold is used because these switches operate at "Logic Levels" (low voltage/current), where preventing oxidation is critical for maintaining electrical continuity. * **Housing/Base:** Glass fiber reinforced polyamide (Nylon) or similar high-temperature thermoplastic, allowing the part to withstand wave soldering. * **Movable Contactor:** A spring-loaded copper alloy mechanism that ensures a crisp "detent" (the clicking feel) and stable electrical connection. --- ### 3. Pin Configuration and Circuitry The "6B" designation often refers to the specific poles and throwing configuration: * **DPDT/Double Pole:** It typically controls two separate circuits simultaneously. * **R2 Designation:** This often refers to the specific orientation of the terminals or the packaging (e.g., right-angle vs. vertical), though in the M2 series, it specifically confirms the **0.100" (2.54mm) terminal spacing** for standard breadboard and PCB grids. --- ### 4. Applications Because of its small footprint and screwdriver-actuated design, this part is commonly used for: 1. **Address Setting:** Setting IDs for devices on a communication bus (like RS-485). 2. **Mode Selection:** Switching between "Test Mode" and "Operation Mode" inside a sealed enclosure. 3. **Configuration:** Hardware-level settings that are not meant to be changed frequently by the end-user.