## Analysis of the M2RT-1B-R (Rotary Switch) The **M2RT-1B-R** is a high-precision, sub-miniature rotary switch typically manufactured by **NKK Switches**. It is designed for PCB mounting and is part of the M2 series, known for its reliability in telecommunications and instrumentation. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Circuit Type** | SPDT (Single Pole Double Throw) | | **Number of Positions** | 2 Positions | | **Mounting Type** | Through Hole, Right Angle | | **Contact Rating** | 0.4VA Max @ 28V AC/DC (Logic Level) | | **Actuator Type** | Screwdriver Slot (Flat Head) | | **Terminals** | PC Pin (Gold plated) | | **Operating Temp** | -30°C to +85°C | --- ### 2. Functional Design Components * **Logic Level Rating:** Unlike power switches, the gold-plated contacts are specifically designed for low-power logic circuits. This prevents oxidation and ensures signal integrity at very low voltages. * **Sealed Construction:** The "R" in the suffix often denotes the specific orientation or packaging. The series generally features a sealed body that protects the internal contacts from flux, cleaning solvents, and environmental contaminants during the soldering process. * **Actuation Method:** It is a "Process Sealed Rotary." Instead of a knob, it usually features a slotted shaft that allows for adjustment via a small screwdriver, preventing accidental switching. --- ### 3. Applications The M2RT-1B-R is commonly found in electronic environments where space is limited and reliability is critical: 1. **Handheld Devices:** For mode selection or configuration. 2. **Medical Equipment:** Internal setting adjustments on circuit boards. 3. **Telecommunications:** Used for "set-and-forget" hardware configurations. 4. **Testing Instruments:** Switching between different diagnostic modes. --- ### 4. Typical Pinout & Circuitry The switch functions by rotating the internal wiper between two distinct terminals. ```text [Terminal 2] / [Common] < \ [Terminal 1] ``` ---