The **KSF-31-R** is a specific model of a **Tactile Switch** (also known as a push-button switch) commonly used in consumer electronics, automotive interfaces, and industrial controls. It is designed for PCB (Printed Circuit Board) mounting. --- ### 1. Technical Specifications The following table summarizes the key electrical and mechanical characteristics of the KSF-31-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Tactile Switch (Momentary) | | **Mounting Type** | Through-hole (THT) | | **Circuit** | SPST (Single Pole Single Throw) | | **Current Rating** | 50mA | | **Voltage Rating** | 12V DC | | **Contact Resistance** | < 100mΩ | | **Actuation Force** | ~160gf to 250gf (Depending on sub-variant) | | **Operating Life** | 100,000 to 500,000 cycles | --- ### 2. Physical Construction The KSF-31-R is composed of several critical layers that define its functionality: 1. **Actuator (Stem):** The physical button you press. In the "R" variant, this is often a round or square plunger made of plastic. 2. **Cover/Frame:** Usually metallic or high-temperature plastic, it holds the internal components together and provides structural integrity. 3. **Contact Dome:** A snap-action metal disc. When pressed, it collapses to complete the circuit and provides the "click" tactile feedback. 4. **Base/Housing:** Contains the terminals and provides the insulation for the electrical contacts. 5. **Terminals:** Usually 4 pins (two pairs connected internally) for stable soldering on a PCB. --- ### 3. Key Features & Applications #### Features * **Tactile Feedback:** Provides a distinct physical "click" sensation to the user, confirming the switch has been activated. * **Compact Footprint:** Designed to save space on crowded PCBs. * **Durability:** Built to withstand hundreds of thousands of presses. #### Common Applications * **Consumer Electronics:** Computer peripherals (mice), remote controls, and kitchen appliances. * **Industrial:** Control panels, reset buttons, and interface modules. * **Automotive:** Dashboard buttons, steering wheel controls, and key fobs. --- ### 4. Circuit Diagram (Simplified) In a standard 4-pin tactile switch like the KSF series, the pins are usually paired: ```text Pin 1 ----|---- Pin 2 | (Switch) Pin 3 ----|---- Pin 4 ``` *Note: Pressing the button connects Pin 1/2 to Pin 3/4.*