The **PMS-2-R** is a specific electronic component, typically categorized as a **Micro-Switch** or a **Push-Button Switch**, commonly manufactured by brands like *Sunmulon* or similar industrial electronics suppliers. It is designed for PCB mounting and is often used in control panels. ### 1. Key Technical Specifications Below are the typical technical parameters for the PMS-2-R series: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Momentary Push Button | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Current Rating** | 0.1A to 3A (depending on voltage) | | **Voltage Rating** | 125V AC / 30V DC | | **Contact Resistance** | < 50 mΩ | | **Operating Force** | 1.5N to 2.5N | | **Mounting Type** | Through-hole (PCB) | --- ### 2. Physical Construction The "PMS-2-R" designation often breaks down into specific physical attributes: * **Internal Contacts:** Usually made of silver or gold-plated alloy to ensure low resistance and prevent oxidation. * **Actuator:** The "-R" suffix often denotes a **Red** plunger or cap color. * **Housing:** High-temperature plastic (PBT or PPS) capable of withstanding wave soldering temperatures. * **Terminals:** Solder-plated brass pins arranged for standard PCB grid spacing. --- ### 3. Functional Operation The PMS-2-R operates as a **Momentary Switch**. This means: 1. **Rest State:** The circuit is in its default position (Normally Closed or Open). 2. **Actuation:** When the button is pressed, the internal spring mechanism moves the contact to the alternate terminal. 3. **Release:** Once pressure is removed, the internal spring force returns the button to its original state immediately. --- ### 4. Typical Applications Due to its compact size and reliability, it is found in: * **Industrial Controls:** Reset buttons or mode selectors. * **Test Equipment:** Calibration triggers. * **Medical Devices:** Interface navigation buttons. * **Consumer Electronics:** Power toggles for high-end audio or laboratory gear. ---