The **KTN-R-200** is a specific model of industrial power fuse belonging to the **Limitron™** series, manufactured by **Bussmann (Eaton)**. It is designed to provide high-speed current limitation and protection for electrical circuits. --- ### ## Technical Specifications Below are the primary electrical characteristics of the KTN-R-200: | Feature | Specification | | :--- | :--- | | **Current Rating** | 200 Amperes | | **Voltage Rating** | 250 Volts AC | | **Interrupting Rating** | 200,000 Amps RMS Symmetrical | | **Fuse Class** | Class RK1 | | **Body Material** | Melamine (Fiberglass) tube | | **Termination Style** | Blade-style (Knife Blade) | | **Speed/Response** | Fast-Acting | --- ### ### Key Components and Construction The KTN-R-200 is composed of several critical electronic and physical parts: 1. **Fuse Element:** * Constructed from a highly conductive material (usually silver or copper alloy). * Designed with specific "notches" that determine the melting point. Because it is **Fast-Acting**, it lacks the time-delay features of an FRN-R fuse, making it ideal for protecting sensitive electronics or non-inductive loads. 2. **Arc Quenching Filler:** * The interior is packed with high-purity **silica sand**. * When the element melts, the sand absorbs the thermal energy and turns into glass (fulgurite), which quickly extinguishes the electric arc and stops current flow. 3. **End Blades:** * The "Knife Blade" terminals are made of heavy-duty plated copper. * These provide a low-resistance connection to the fuse block or disconnect switch. 4. **Rejection Feature:** * As a **Class RK1** fuse, it features a physical notch in the blade. This prevents the installation of lower-rated fuses (like Class H) into a circuit that requires the high interrupting capacity of an RK1. --- ### ### Applications The KTN-R-200 is typically used in the following scenarios: * **Branch Circuit Protection:** Standard industrial power distribution. * **VFD Protection:** Often used to protect Variable Frequency Drives due to its fast-acting nature. * **Switchboards and Panelboards:** Protecting components against massive short-circuit currents. * **Non-Inductive Loads:** Ideal for resistive heating elements or lighting circuits where "in-rush" current is minimal. ---