The **M2TT-NC-R** refers to a specific type of **Miniature Toggle Switch** commonly used in industrial control panels, medical equipment, and telecommunications. This specific part number typically belongs to the **M2 series** (often manufactured by NKK Switches or similar high-reliability electronic component brands). --- ### 1. Part Number Breakdown Understanding the electronic specifications requires breaking down the alphanumeric code: | Component Code | Description | Electronic Meaning | | :--- | :--- | :--- | | **M2** | Series Designation | Miniature process-sealed toggle switch. | | **TT** | Actuator/Bushing | Process-sealed, standard toggle length, threaded bushing. | | **NC** | Circuitry | **Normally Closed (NC)** contact configuration. | | **R** | Contact Material | **Gold contacts**, typically used for logic-level (low power) applications. | --- ### 2. Core Electronic Specifications These parts are designed for reliability in harsh environments, featuring specific electrical tolerances: * **Current Rating:** * *Logic Level:* 0.4VA maximum @ 28V AC/DC maximum. * *Note:* The "R" designation (Gold) is specifically for low-power circuits where oxidation must be minimized. * **Contact Resistance:** Typically 50 milliohms maximum. * **Insulation Resistance:** 1,000 Megohms minimum @ 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts for at least one minute. * **Mechanical Life:** 100,000 operations minimum. --- ### 3. Physical & Design Features The M2TT-NC-R is an "environmentally friendly" component with the following physical attributes: #### Sealing and Protection The unit is **process sealed**, meaning it is designed to withstand automated soldering and washing processes. It often features an O-ring inside the bushing and an epoxy seal at the base of the terminals to prevent flux or cleaning solvents from entering the switch mechanism. #### Termination * **PC Mount:** Usually features straight PC terminals for mounting directly onto a Printed Circuit Board. * **Pitch:** Standard 2.54mm (0.100") terminal spacing for easy PCB integration. --- ### 4. Typical Applications Due to the gold contacts and sealed nature, this part is found in: 1. **Handheld Devices:** Where space is limited and low power is used. 2. **Industrial Controllers:** Used as a reset or limit switch in dusty/moist environments. 3. **Testing Equipment:** Where signal integrity (low resistance) is vital. ---