The **FRTS-4F-R** is a specific electronic component typically identified as a **tactile switch** (or tact switch) used in various electronic control interfaces. Below is a detailed breakdown of its technical characteristics and internal parts. --- ### 1. General Specifications The FRTS-4F-R belongs to a category of surface-mount or through-hole switches designed for low-power signaling. | Feature | Description | | :--- | :--- | | **Component Type** | Tactile Switch | | **Circuit Configuration** | SPST (Single Pole Single Throw) | | **Switch Function** | Momentary (Normally Open) | | **Mounting Type** | Usually SMT (Surface Mount Technology) | | **Operating Force** | Typically 160gf to 250gf (grams-force) | --- ### 2. Internal Electronic & Mechanical Parts A tactile switch like the FRTS-4F-R consists of four primary internal components that work together to complete an electrical circuit: 1. **The Cover (Shield):** * Usually made of stainless steel or nickel-plated brass. * Protects the internal mechanism and provides a structural anchor for the solder terminals. 2. **The Actuator (Stem):** * The physical button that the user presses. * In the "4F" series, this is often a flat or slightly raised plunger made of heat-resistant plastic (like LCP or Nylon). 3. **The Contact Dome (The "Snap" Element):** * A circular or cross-shaped piece of spring metal. * **Function:** When pressed, it collapses (providing tactile feedback) and connects the stationary contacts. When released, it springs back to break the circuit. 4. **The Base (Housing):** * A molded plastic resin base that holds the stationary terminals in place. 5. **Terminals:** * Silver-plated or gold-plated copper alloy pins that are soldered to the PCB. --- ### 3. Electrical Characteristics These parts are designed for signal-level currents, not for driving heavy loads directly. * **Contact Rating:** Typically 50mA at 12V DC. * **Contact Resistance:** Usually < 100mΩ. * **Insulation Resistance:** 100MΩ minimum at 100V DC. * **Dielectric Strength:** 250V AC for 1 minute. --- ### 4. Applications Because of its small footprint and reliable tactile "click," the FRTS-4F-R is commonly found in: * **Consumer Electronics:** Remote controls, cameras, and audio equipment. * **Computing:** Keyboards, reset buttons on motherboards. * **Industrial:** Interface panels and PLC controllers.