The **KB-2JLN-R** is a specific model of a **Miniature Pushbutton Switch**, typically manufactured by Kingbright or similar component providers. It is designed for PCB (Printed Circuit Board) mounting and is often used in consumer electronics or industrial control panels. --- ### 1. Technical Specifications The following table outlines the standard electrical and physical characteristics for this component: | Feature | Specification | | :--- | :--- | | **Switch Type** | Pushbutton | | **Circuit Type** | SPST (Single Pole Single Throw) | | **Switch Function** | Off-Mom (Momentary - returns to original state) | | **Mounting Type** | Through-Hole (PCB) | | **Contact Rating** | Typically 100mA @ 12V DC | | **Illumination** | Non-Illuminated (standard model) | | **Color/Material** | Typically Black/Red Actuator | --- ### 2. Key Features and Construction * **Momentary Action:** The switch only completes the circuit while the button is physically being pressed down. Once released, the internal spring pushes the actuator back, breaking the circuit. * **Tactile Feedback:** These switches usually provide a "click" sensation, confirming to the user that the input has been registered. * **Compact Footprint:** Designed for high-density board layouts where space is limited. * **Durability:** Usually rated for thousands of cycles (actuations) before mechanical failure. --- ### 3. Pinout and Internal Logic The KB-2JLN-R generally features 2 or 4 pins. In 4-pin configurations, the pins are often connected in pairs to provide mechanical stability on the PCB. ```text [ Schematic View ] 1 o-------o 2 | [Switch] | 3 o-------o 4 (Pins 1 & 2 are internally shorted; Pins 3 & 4 are internally shorted) ``` --- ### 4. Common Applications * **Reset Buttons:** Used on motherboards or microcontrollers (like Arduino/ESP32). * **User Input:** Selection buttons on household appliances (microwaves, coffee makers). * **Control Interfaces:** Start/Stop triggers in industrial handheld devices. ---