The **KFS-B3-R/Q** is a specific series of industrial limit switches or micro-switches, typically manufactured by brands like **Kacon** or similar industrial control providers. These devices are designed to convert mechanical motion into an electrical control signal. --- ### 1. Key Technical Specifications The "R/Q" suffix usually denotes the specific actuator type (e.g., Roller Lever or Plunger). | Feature | Specification (Typical) | | :--- | :--- | | **Contact Configuration** | 1NO + 1NC (Single Pole Double Throw - SPDT) | | **Rated Voltage** | 250V AC / 125V DC | | **Rated Current** | 10A to 15A (Resistive Load) | | **Insulation Resistance** | 100MΩ min. (at 500V DC) | | **Contact Resistance** | 15mΩ max. (Initial) | | **Protection Degree** | IP40 to IP65 (Model dependent) | | **Operating Temperature** | -25°C to +80°C | --- ### 2. Internal Electronic/Mechanical Components The device consists of several critical internal parts that manage the electrical flow: 1. **Stationary Contacts:** Fixed points connected to the wiring terminals. 2. **Movable Contact (Spring Blade):** A high-conductivity copper alloy leaf spring that snaps between the NO (Normally Open) and NC (Normally Closed) positions. 3. **Actuator:** The physical interface (Roller or Plunger). The "R" usually indicates a **Roller Lever**, while "Q" often refers to a **Cross Roller Plunger** or specific mounting orientation. 4. **Housing:** Usually made of Phenolic resin or high-grade plastic for high dielectric strength and heat resistance. --- ### 3. Wiring Logic The switch operates on a simple break/make principle. Below is a representation of the terminal logic: ```c Terminal COM (Common) --> Power Input Terminal NC (Closed) --> Power output when switch is IDLE Terminal NO (Open) --> Power output when switch is PRESSED ``` --- ### 4. Common Applications * **Safety Interlocks:** Ensuring a machine door is closed before operation. * **Position Detection:** Sensing the end-of-travel for a CNC axis or conveyor belt. * **Object Counting:** Triggering a pulse when an item passes a roller. ---