The **M2TT-3A-R** is a specific electronic component within the category of **Toggle Switches**, commonly manufactured by brands like NKK Switches. It belongs to the M2 series, which is known for its compact size and high reliability in PCB (Printed Circuit Board) applications. --- ### 1. Key Technical Specifications The part number "M2TT-3A-R" describes its physical and electrical characteristics: | Feature | Specification | | :--- | :--- | | **Switch Type** | Toggle Switch | | **Circuit Configuration** | DPDT (Double Pole, Double Throw) | | **Switch Function** | ON-ON | | **Mounting Type** | Through-Hole, Right Angle (Horizontal) | | **Contact Rating** | Usually 1A @ 125V AC or 0.4VA Max @ 28V AC/DC | | **Actuator Style** | Standard Bat Lever | | **Termination Style** | PC Pins | --- ### 2. Breakdown of the Component Parts #### A. The Actuator (Toggle) The "3A" in the part number often refers to the specific lever length and style. This is the manual interface used to flip the switch between its two states. #### B. The Housing and Bushing Constructed from high-temperature materials (often Diallyl Phthalate or similar resins), the housing protects the internal silver or gold-plated contacts. The bushing is usually non-threaded in the "M2" series, designed for direct PCB mounting rather than panel mounting. #### C. Contact System * **DPDT Logic:** This switch controls two separate circuits simultaneously. Each "pole" has a common pin that toggles between two "throw" pins. * **R-Suffix (Gold Contacts):** The "R" usually indicates that the contacts are logic-level (Gold-plated). This is critical for low-power electronic signals where oxidation on silver contacts would cause resistance. #### D. PC Terminals (Right Angle) The "TT" designation typically indicates the terminal shape. The right-angle orientation allows the switch to sit parallel to the PCB, with the toggle protruding from the side of the device enclosure. --- ### 3. Common Applications Due to its small footprint and DPDT configuration, the M2TT-3A-R is found in: * **Handheld Instruments:** Power on/off or mode selection. * **Audio Equipment:** Signal routing or bypass switching. * **Industrial Controls:** Setting parameters on a control board. * **Medical Devices:** Compact user-interface controls. ---