The **M2RT-51-R** is a high-performance, ultra-miniature toggle switch manufactured by **NKK Switches**. It is specifically designed for PC board mounting and is known for its "logic-level" reliability and space-saving design. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Circuit Type** | DPDT (Double Pole Double Throw) | | **Switch Function** | ON-NONE-ON | | **Current/Voltage Rating** | 0.4VA maximum @ 28V AC/DC maximum | | **Mounting Type** | Through Hole, Right Angle | | **Actuator Style** | Flatted Lever | | **Termination Style** | PC Pin | | **Contact Material** | Gold over Nickel (Logic Level) | --- ### 2. Major Electronic Components & Design Features #### A. Gold-Plated Contacts The "R" in the part number signifies the contact rating. Because it uses **gold plating**, it is designed strictly for **logic-level circuits**. * **Purpose:** Prevents oxidation and ensures a reliable connection even when very low voltage/current (dry circuits) is applied. * **Limitation:** It cannot be used for power applications (high amperage), as the gold would weld or burn off. #### B. Bifurcated Contact Mechanism The internal contact points are often bifurcated (split). * **Benefit:** This provides redundant contact points, which significantly increases electrical reliability and ensures a stable connection even in environments with vibration. #### C. Carbon-Filled Polyamide Housing The body of the switch is constructed from a high-performance polymer. * **Heat Resistance:** It is designed to withstand the high temperatures of wave soldering without deforming. * **Antistatic Properties:** The material helps dissipate static electricity, protecting sensitive CMOS components on the PCB. #### D. Sealed Construction The M2 series features an ultrasonic welding of the transition between the base and the housing. * **Protection:** This prevents flux, solvents, and other contaminants from entering the contact area during the soldering and cleaning process. --- ### 3. Application Use Cases Due to its right-angle orientation and logic-level rating, the M2RT-51-R is commonly found in: * **Handheld Instruments:** Where space is at a premium. * **Medical Equipment:** For mode selection in diagnostic tools. * **Telecommunications:** For resetting or toggling logic states on server blades. * **Audio/Visual:** Low-signal switching in professional mixing consoles. ---