The **M2TT-NC-R/N** is a specific model within the **M2 series** of miniature toggle switches manufactured by **NKK Switches**. These components are widely used in industrial equipment, medical devices, and high-end consumer electronics due to their reliability and small footprint. --- ### 1. Part Number Breakdown Understanding the suffix codes is essential for identifying the specific electronic and mechanical properties: | Component | Code | Description | | :--- | :--- | :--- | | **Series** | M2 | Miniature Process Sealed Toggles | | **Terminal** | TT | Straight PC Terminals (through-hole) | | **Circuit** | NC | ON-NONE-ON (Single Pole Double Throw / SPDT) | | **Contact** | R | Gold Contacts (Low Logic Level) | | **Bushing** | N | Plain, Non-Threaded Bushing | --- ### 2. Key Technical Specifications The electrical characteristics are designed for high-precision, low-power applications. * **Contact Rating:** 0.4VA maximum @ 28V AC/DC maximum. * **Electrical Life:** 50,000 operations minimum. * **Mechanical Life:** 100,000 operations minimum. * **Contact Resistance:** 50 milliohms maximum. * **Insulation Resistance:** 500 Megohms minimum @ 500V DC. * **Dielectric Strength:** 500V AC minimum for one minute. * **Operating Temp:** $-30^{\circ}C$ to $+85^{\circ}C$. --- ### 3. Core Electronic Features #### A. Process Sealed Construction The "M2" series is famous for being **totally sealed**. The housing is ultrasonically welded, and the terminals are epoxy sealed. * **Benefit:** This allows the PCB to be subjected to automated soldering and cleaning (washing) processes without contaminants entering the switch mechanism. #### B. Gold Contacts ("R" Rating) The "R" in the part number signifies gold-plated contacts. * **Function:** Gold is used for "Logic Level" applications where voltage and current are too low to break through the oxidation that forms on silver contacts. * **Application:** Ideal for interfacing directly with microcontrollers, PLCs, or high-impedance circuits. #### C. Anti-Jamming Design The internal mechanism features an anti-jamming design that protects the contacts from damage if excessive force is applied to the toggle lever. --- ### 4. Physical Dimensions (Approximate) | Dimension | Measurement | | :--- | :--- | | **Body Width** | ~7.0 mm | | **Terminal Pitch** | 2.54 mm (Standard 0.1" breadboard/PCB spacing) | | **Toggle Length** | ~10.5 mm | ---