The **5SF5-R** is a specific model of a **Miniature Fast-Acting Glass Tube Fuse**. These components are critical for circuit protection, designed to sacrifice themselves to prevent damage to more expensive electronic equipment in the event of an overcurrent. ### 1. Technical Specifications Below is the standard technical breakdown for the 5SF5-R series: | Parameter | Specification | | :--- | :--- | | **Part Number** | 5SF5-R | | **Fuse Type** | Glass Tube (Fast-Acting) | | **Ampere Rating** | 5 Amperes (5A) | | **Voltage Rating** | 250V AC | | **Dimensions** | 5mm x 20mm | | **Response Time** | Fast-Acting (F) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | | **Interrupting Rating** | 35A @ 250V AC | --- ### 2. Physical Characteristics * **Body Material:** High-quality glass tube, allowing for visual inspection of the internal fuse element. * **End Caps:** Nickel-plated brass end caps for high conductivity and corrosion resistance. * **Internal Element:** A thin wire or strip designed to melt instantly when current exceeds the 5A threshold. ### 3. Key Features * **Fast-Acting (F):** Unlike "Slow-Blow" fuses, the 5SF5-R reacts almost instantly to surges. It is ideal for sensitive electronics that cannot withstand even brief overcurrents. * **Compact Size:** The 5mm x 20mm form factor is a global standard for small appliances and PCB-mounted fuse holders. * **Visual Confirmation:** The glass body allows a technician to see if the internal wire has "blown" (melted) without needing a multimeter. ### 4. Common Applications The 5SF5-R is typically found in: 1. **Consumer Electronics:** Power supplies, chargers, and television sets. 2. **Industrial Equipment:** Control panels and PLC protection. 3. **Lighting:** Ballasts and LED driver protection. 4. **Test Instruments:** Multimeters and oscilloscopes. --- ### 5. Proper Replacement Guide When replacing a 5SF5-R, ensure the replacement matches the following: * **Size:** Must be 5x20mm. * **Amps:** Must be exactly 5A. Using a higher amp fuse creates a fire hazard. * **Speed:** Must be "Fast-Acting." Replacing this with a "Time-Delay" (Slow-Blow) fuse could lead to component failure before the fuse blows.