## Overview of the 5HFP400-R The **5HFP400-R** is a high-performance **radial leaded subminiature fuse**. It belongs to the "5HFP" series produced by Bel Fuse Inc. These fuses are designed for space-constrained applications where reliable overcurrent protection is critical. --- ### Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the 5HFP400-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 400 mA | | **Voltage Rating (AC)** | 250 V | | **Fuse Type** | Quick-Acting / Fast Blow | | **Mounting Style** | Through Hole (Radial Lead) | | **Body Material** | Ceramic | | **Lead Finish** | Matte Tin-Plated Copper | | **Breaking Capacity** | 100A @ 250V AC | | **Operating Temperature** | -55°C to +125°C | | **Compliance** | RoHS 6 Compliant, Lead-Free | --- ### Key Features and Construction 1. **Fast-Acting Characteristic:** The "HFP" designation indicates a **fast-acting** blow time. This means the fuse is designed to disconnect the circuit very quickly when an overload occurs, protecting sensitive downstream components like semiconductors. 2. **Compact Form Factor:** The "subminiature" design allows it to occupy minimal PCB real estate compared to standard glass cartridge fuses (e.g., 5x20mm). 3. **Safety Approvals:** These components are typically recognized by safety agencies such as **UL (Underwriters Laboratories)** and **CSA**, ensuring they meet international safety standards for fire and shock prevention. --- ### Typical Applications The 5HFP400-R is commonly found in the following electronic environments: * **Power Supplies:** Used as primary protection in small AC/DC adapters. * **Consumer Electronics:** Protecting circuit boards in televisions, monitors, and chargers. * **Industrial Equipment:** Overcurrent protection for control circuits and sensors. * **Telecommunications:** Protection for networking hardware and modems. --- ### Identification Breakdown * **5HFP**: Series name (Fast-acting, radial lead). * **400**: Current rating (400 milliamps). * **-R**: Indicates compliance with RoHS (Restriction of Hazardous Substances) standards.