The **FNQ-R-25** is a high-performance, current-limiting fuse specifically designed for industrial and commercial electrical systems. It belongs to the **Class CC** family of fuses, which are known for their compact size and superior protection capabilities. --- ### ## Technical Specifications The following table outlines the primary electrical characteristics of the FNQ-R-25: | Property | Specification | | :--- | :--- | | **Brand** | Bussmann (Eaton) | | **Amperage Rating** | 25 Amps | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps RMS Symmetrical | | **Class** | Class CC | | **Response Characteristic** | Time-Delay (Slow-Blow) | | **Physical Dimensions** | 13/32" x 1-1/2" (10.3 x 38.1 mm) | --- ### ## Key Electronic Features #### 1. Time-Delay Functionality The FNQ-R-25 is a **Time-Delay** fuse. This means it is designed to withstand temporary "inrush" currents (spikes) without blowing. This is critical for circuits involving inductive loads like motors or transformers, which draw significantly more power for a fraction of a second when they first start up. #### 2. Rejection Feature As a Class CC fuse, it features a unique physical "rejection tip." This is a mechanical safety feature that prevents the installation of lower-rated fuses (like standard midget fuses) into a Class CC fuse holder, ensuring the circuit remains protected at the intended level. #### 3. High Current Limitation This fuse is highly **current-limiting**. In the event of a short circuit, it reacts extremely fast to restrict the amount of peak let-through energy. This protects downstream sensitive electronic components from being destroyed by the massive heat and magnetic forces of a fault. --- ### ## Common Applications * **Control Transformers:** Specifically designed to handle the high inrush currents of control power transformers. * **Motor Branch Circuits:** Used for small motor protection where space is limited. * **Solenoids:** Protects inductive coils from sustained overloads while ignoring starting surges. * **General Purpose:** Any 600V or lower circuit requiring high-capacity interruption in a small footprint. ---