The **KWN-R-25** is a specific model of high-performance industrial fuse, commonly used in electrical protection systems. It belongs to the **Class R** family of fuses, which are designed for rejection capability to prevent the installation of fuses with lower interrupting ratings. --- ### ## Technical Specifications The following table outlines the primary electrical characteristics of the KWN-R-25: | Feature | Specification | | :--- | :--- | | **Model Number** | KWN-R-25 | | **Amperage Rating** | 25 Amps | | **Voltage Rating (AC)** | 250 Volts AC | | **Interrupting Rating** | 200,000 Amps RMS Symmetrical | | **Fuse Class** | Class R (RK1) | | **Response Characteristic** | Fast-Acting | | **Material** | Melamine tube with plated end caps | --- ### ## Key Electronic Components & Design The KWN-R-25 is not an "electronic" device in the sense of having microchips, but its internal construction is a precise piece of electrical engineering: 1. **Fast-Acting Element:** Unlike "Time-Delay" fuses (which can handle temporary surges), the KWN-R-25 is **Fast-Acting**. It is designed to open almost instantly when it detects an overcurrent or short-circuit condition. 2. **Rejection Feature:** The "R" in the name indicates a rejection feature. The physical dimensions (specifically the notched blade or ferrule) prevent it from being replaced by a standard Class H or K fuse, ensuring the circuit remains protected at a high interrupting capacity. 3. **Current Limitation:** It is highly current-limiting. In the event of a massive short circuit, the fuse reacts so quickly that it stops the current before it reaches its full destructive peak. ### ## Applications The KWN-R-25 is typically found in: * **Main Service Switches:** Protecting the entry point of power to a building. * **Panelboards:** Protecting individual branch circuits. * **Non-Inductive Loads:** Ideal for resistive loads like heating elements or lighting circuits where high inrush currents are not present. ---