The **M2RTS-R-21-M2/N** belongs to the **M2R Series** of professional-grade toggle switches manufactured by **Nikkai (NKK Switches)**. This specific part number represents a miniature, high-reliability toggle switch often used in industrial control panels and instrumentation. --- ### 1. Part Number Breakdown The nomenclature reveals the specific electronic and mechanical characteristics of the component: | Segment | Code | Description | | :--- | :--- | :--- | | **Series** | M2R | Miniature Toggle Switch Series | | **Circuit** | TS | Likely refers to Terminal/Switch configuration (standard) | | **Actuator** | R | Round/Standard Toggle Lever | | **Pole/Throw** | 21 | Double Pole, Single Throw (DPST) or specific Terminal Mapping | | **Terminal** | M2 | Right Angle PC Mount (Threaded Bushing) | | **Plating** | N | Silver Contacts (Standard) | --- ### 2. Key Electronic Specifications These switches are designed for low-to-medium power applications where durability is critical. * **Contact Rating:** Typically 6A @ 125V AC or 3A @ 250V AC. * **Contact Resistance:** Max 10 mΩ (initial). * **Insulation Resistance:** Min 1,000 MΩ @ 500V DC. * **Dielectric Strength:** 1,000V AC minimum between contacts for one minute. * **Mechanical Life:** 100,000 cycles minimum. * **Electrical Life:** 25,000 to 50,000 cycles (depending on load). --- ### 3. Physical Construction The "M2" designation in the suffix is particularly important as it dictates how the part interacts with a Printed Circuit Board (PCB). 1. **Mounting Style:** This is a **Right-Angle PC Mount** component. Instead of the pins sticking straight out the bottom, they are bent at a 90-degree angle so the toggle lever protrudes from the side of the board (parallel to the PCB). 2. **Sealing:** Most M2 series switches feature an epoxy seal at the base of the terminals to prevent flux and contaminants from entering the internal mechanism during soldering. 3. **Bushing:** Features a threaded bushing, allowing it to be secured to a front panel using a hex nut even though it is soldered to a PCB. --- ### 4. Typical Applications Due to the right-angle mounting and high cycle life, this part is commonly found in: * **Communication Equipment:** Rack-mounted servers or radio gear. * **Medical Instrumentation:** Diagnostic devices requiring tactile feedback. * **Industrial Automation:** Control logic toggles on interface boards. * **Test & Measurement:** Oscilloscopes or signal generators. ---