The **M2TT-3A-R2/BL** is a specialized electronic component, typically identified as a **high-precision, ultra-miniature toggle switch** belonging to specific industrial or aerospace-grade series (often associated with manufacturers like NKK Switches or similar high-reliability brands). Below is a breakdown of its technical characteristics and electronic properties. --- ### 1. Technical Specifications The part number defines the mechanical and electrical behavior of the switch. | Feature | Specification | Description | | :--- | :--- | :--- | | **Circuit Type** | DPDT | Double Pole, Double Throw | | **Switch Function** | ON-ON | Two stable positions (No momentary action) | | **Contact Material** | Silver or Gold Plated | High conductivity and corrosion resistance | | **Mounting Type** | Through-Hole (PC Terminals) | Designed for PCB mounting | | **Actuator Type** | Lever / Toggle | Standard bat-style toggle | | **Illumination** | Non-Illuminated | Standard mechanical operation | --- ### 2. Key Electronic Components & Materials #### A. Contacts and Ratings The "R2" suffix often denotes specific contact ratings or plating. * **Logic Level:** If the contacts are gold-plated, it is designed for low-energy circuits (0.4VA max @ 28V AC/DC). * **Power Level:** If silver, it handles higher currents (typically 1A to 6A @ 125V AC). #### B. The "BL" Suffix In electronic part numbering, **BL** usually refers to the physical aesthetic or a specific material property: * **Color:** Indicates a **Black** actuator or a black bezel. * **Sealing:** May indicate a "Bottom Sealed" construction to prevent soldering flux from entering the internal contact mechanism during PCB assembly. --- ### 3. Structural Design The device is engineered for longevity and environmental resistance: * **Case/Base:** Usually made of Diallyl Phthalate (DAP) or high-temp PPS resin to withstand wave soldering temperatures. * **Bushing:** Often threaded or plain, providing the mechanical interface for the panel or PCB. * **Terminals:** Molded-in terminals act as a barrier to keep contaminants out. --- ### 4. Circuit Diagram (DPDT) The DPDT configuration allows the switch to control two separate circuits simultaneously. ```text Terminal Layout: [1] [4] <- Pole 1 / Pole 2 [2] [5] <- Common [3] [6] <- Pole 1 / Pole 2 Operation: Position 1: 2-1 and 5-4 connected. Position 2: 2-3 and 5-6 connected. ```