The **KGS44-R/K** is a high-performance, rotary-action limit switch (often referred to as a "cross-limit switch") manufactured by **Kiepe Elektrik**. It is primarily used in heavy industry for the control and safety end-limiting of cranes, hoists, and overhead traveling equipment. --- ### 1. Key Electronic Components and Specifications The device operates as an electromechanical interface, converting physical rotation into electrical signals. Below are the primary electronic and technical specifications: | Feature | Specification | | :--- | :--- | | **Contact Type** | Silver-alloy snap-action contacts | | **Contact Configuration** | Up to 4 potential-free changeover contacts (SPDT) | | **Thermal Current ($I_{th}$)** | 16 A | | **Rated Operating Voltage ($U_e$)** | 400 V AC / 230 V DC | | **Switching Frequency** | Up to 1,000 operations per hour | | **Connection Type** | Screw terminals (M4) | | **Ingress Protection** | IP 65 (Dust-tight and water jet protection) | --- ### 2. Functional Electronic Parts #### A. Snap-Action Microswitches Inside the housing, the KGS44 contains up to four independent switching elements. These use a **snap-action mechanism**, ensuring that the transition between "Open" and "Closed" states is instantaneous, regardless of how slowly the external actuator moves. This prevents electrical arcing and reduces wear on the silver contacts. #### B. The Cam Disk System The central shaft is connected to adjustable cam disks. These disks are the "programming" interface of the switch: * **Mechanical Memory:** Each cam can be adjusted to trigger its corresponding contact at a specific angular position. * **Precision:** Fine-tuning screws allow for exact calibration of the switching point. #### C. Terminals and Wiring The internal electronic block features heavy-duty screw terminals. These are designed to handle high-vibration environments typical of gantry cranes. It usually includes: * **PE Connection:** A dedicated ground terminal for safety. * **M20/M25 Cable Entries:** Typically two threaded entries to allow for daisy-chaining or separate control/power lines. --- ### 3. Application Circuitry In a standard industrial setup, the KGS44-R/K is wired into the **Control Circuit** of a Motor Starter or Variable Frequency Drive (VFD). 1. **Stop Function:** One contact is wired to the "Slow Down" input of the controller. 2. **Emergency Stop:** The second contact (triggered shortly after the first) is wired to the "Main Contactor" to cut power entirely if the crane exceeds the safety zone. --- ### 4. Durability Ratings * **Mechanical Life:** > 1 million switching cycles. * **Housing Material:** Aluminum pressure die-casting (providing EMI shielding for the internal contacts). * **Temperature Range:** -25 °C to +70 °C.