The **5SFP2-R** is a high-performance **Fast-Acting Fuse** (F) designed for electronic circuits. It is part of the 5SFP series manufactured by Bel Fuse Inc. These fuses are specifically engineered for pigtail/axial lead mounting on printed circuit boards (PCBs). ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Current Rating** | 2 Amperes (2A) | | **Voltage Rating (AC)** | 250 Volts | | **Fuse Type** | Fast-Acting (F) | | **Body Material** | Glass Tube | | **Mounting Type** | Through-Hole (Axial Leads) | | **Size** | 5mm x 20mm | | **Interrupting Rating** | 35A @ 250V AC / 10kA @ 125V AC | | **Compliance** | RoHS 6 Compliant | --- ### 2. Physical Design and Features The 5SFP2-R features a standard glass body which allows for easy visual inspection of the internal fuse filament. * **Axial Leads:** The "-R" suffix typically denotes the pigtail/axial lead version, meaning the fuse is meant to be soldered directly into a PCB rather than placed in a clip. * **Fast-Acting Characteristic:** This fuse is designed to open (blow) very quickly when it encounters an overcurrent. It is ideal for protecting sensitive semiconductor devices. * **Construction:** Brass caps with nickel plating and tin-plated copper leads. --- ### 3. Application Use Cases Because of its fast response time and 2A rating, this part is commonly found in: 1. **Consumer Electronics:** Power supplies for laptops, monitors, and chargers. 2. **Industrial Equipment:** Control boards and sensitive instrumentation. 3. **LED Lighting:** Protection for driver circuits. 4. **Telecom:** Networking hardware and line cards. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting replacements: | Code | Meaning | | :--- | :--- | | **5SFP** | Series Name (5x20mm, Fast-Acting, Pigtail) | | **2** | Current Rating (2 Amps) | | **-R** | RoHS Compliant and Lead-Free | ---