The part number **M2RT-01-R2/BL** refers to a high-quality **industrial-grade tactile rotary switch** manufactured by **Copals Electronics** (a division of Nidec). These switches are commonly used in instrumentation, communication equipment, and industrial automation where precision and reliability are required. --- ### 1. Key Technical Specifications The following table highlights the core electrical and mechanical characteristics of the M2RT series: | Feature | Specification | | :--- | :--- | | **Switch Type** | Rotary Switch (Tactile Feedback) | | **Number of Positions** | 2 positions (typically 0 and 1) | | **Contact Rating** | 0.4 VA max (Low Voltage/Logic level) | | **Maximum Voltage** | 28V AC/DC | | **Operating Temperature** | -25°C to +70°C | | **Life Cycle** | ~100,000 operations | | **Mounting Type** | Through-hole (PCB Mount) | | **Seal Quality** | Washable / Process Sealed | --- ### 2. Breakdown of the Part Number The suffix and prefix provide specific information about the physical configuration: * **M2RT**: The series designation (Sub-miniature Rotary Tactile). * **01**: Indicates the number of poles (Single Pole). * **R2**: Refers to the terminal shape (Right-angle, dual-pin spacing). * **/BL**: Usually refers to the color or specific packaging/actuator style (Blue Cap/Indicator). --- ### 3. Component Design Features The M2RT series is engineered for specific performance environments: 1. **Gold Contacts**: The contacts are typically gold-plated to ensure high reliability when switching low-level signals (Logic levels), preventing oxidation. 2. **Washable Construction**: The body is sealed with an O-ring and epoxy, allowing the PCB to be cleaned with solvents after soldering without damaging the internal switch mechanism. 3. **Positive Detent**: It provides a "click" sensation (tactile feedback), ensuring the user knows exactly when the switch has moved to the next position. 4. **Compact Footprint**: Designed for high-density PCB layouts where space is a premium. --- ### 4. Common Applications * **Mode Selection**: Switching between manual and auto modes in handheld devices. * **Address Setting**: Setting IDs for networked sensors or industrial controllers. * **Calibration**: Adjusting gain or sensitivity settings on medical or lab equipment.