The **KUS-161-R** is a specific electronic component primarily identified as a **tactile switch** (often used in computer mice, specifically for side buttons or DPI switches). It belongs to a family of micro-switches designed for compact electronic devices. --- ### 1. Technical Specifications The following table summarizes the key electrical and mechanical characteristics typical for the KUS-161-R series: | Feature | Specification | | :--- | :--- | | **Type** | Tactile Switch / Micro-switch | | **Mounting Type** | Surface Mount (SMD / SMT) | | **Circuit** | SPST-NO (Single Pole Single Throw - Normally Open) | | **Current Rating** | ~50mA | | **Voltage Rating** | 12V DC | | **Operating Force** | 1.6N ± 0.5N (Standard 160gf) | | **Travel Distance** | ~0.25mm | | **Lifespan** | 1,000,000 to 5,000,000 cycles (model dependent) | --- ### 2. Key Electronic Components & Materials The internal architecture of the KUS-161-R consists of several critical parts that ensure signal integrity: 1. **Contact Dome (The Heart):** * Usually made of a high-quality stainless steel alloy with silver or gold plating. * It provides the "click" tactile feedback and completes the circuit when depressed. 2. **Base (Housing):** * Constructed from high-temperature resistant thermoplastic (LCP - Liquid Crystal Polymer). * Designed to withstand the heat of reflow soldering during PCB assembly. 3. **Terminals:** * Lead-frame pins extending from the base. They are usually silver-plated to ensure low contact resistance and excellent solderability. 4. **Actuator (The Button):** * A small plastic plunger that transfers the physical force from the user's finger to the internal dome. --- ### 3. Functional Mechanism The KUS-161-R operates on a simple momentary contact principle: * **Resting State:** The metal dome is arched, keeping the internal contacts separated (Open Circuit). * **Pressed State:** Pressure forces the dome to collapse, bridging the gap between the center terminal and the outer terminals (Closed Circuit). * **Release:** The elasticity of the dome causes it to snap back to its original shape, breaking the electrical connection and providing the "reset" feel. --- ### 4. Common Applications Due to its small footprint and specific height, this part is frequently found in: * **Gaming Peripherals:** Side buttons (G4/G5) on Logitech, Razer, or SteelSeries mice. * **Consumer Electronics:** Volume rockers on tablets or power buttons on small handheld devices. * **Industrial Controls:** Reset switches on embedded PCB boards.