The **KUS-FW1-R** is a specialized electronic component primarily used as a **limit switch** or **position sensor**, often found in the assembly of high-end appliances, industrial equipment, or automotive door/latch systems. It is characterized by its compact, sub-miniature design and high reliability. --- ## 1. Technical Specifications The following table outlines the core electrical and mechanical parameters of the KUS-FW1-R: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Micro-switch / Snap Action | | **Contact Rating** | Typically 0.1A to 3A @ 125V AC / 30V DC | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Actuator Type** | Simulated Roller Lever / Pin Plunger | | **Operating Force** | ~1.5N (varies by sub-model) | | **Termination** | Solder terminals or PCB Mount | | **Durability** | >100,000 cycles (Electrical) | --- ## 2. Key Electronic Features ### A. Snap-Action Mechanism The "FW" series utilizes a spring-loaded snap-action mechanism. This ensures that the transition between "Open" and "Closed" states happens rapidly, regardless of the speed at which the physical actuator is pressed. This minimizes **arcing** and prevents contact degradation. ### B. Gold or Silver Alloy Contacts Depending on the specific variant (indicated by suffixes), the internal contacts are often plated with gold or silver. * **Gold:** Used for low-current "logic level" applications to prevent oxidation. * **Silver:** Used for higher power switching applications. ### C. Environmental Sealing The "R" in the part number often denotes a specific orientation or a **waterproof/dustproof** rating (typically IP67). This involves a rubber seal or silicone boot around the actuator button to prevent moisture ingress into the electronic chamber. --- ## 3. Terminal Configuration The device typically features three pins, though some versions may only use two: 1. **COM (Common):** The input terminal. 2. **NO (Normally Open):** The circuit is completed only when the lever is pressed. 3. **NC (Normally Closed):** The circuit is broken when the lever is pressed. --- ## 4. Common Applications * **Automotive:** Detecting if a door is latched or a seatbelt is buckled. * **Appliances:** Door interlock switches for microwave ovens or washing machines. * **Industrial:** End-stop detection for 3D printers or CNC limit sensing.