The **S501-5-R** is a specific model of electronic fuse manufactured by **Eaton (formerly Bussmann)**. It belongs to the S501 series, which consists of high-quality, fast-acting miniature glass tube fuses. --- ## 1. Technical Specifications The following table outlines the core electrical characteristics of the S501-5-R: | Parameter | Specification | | :--- | :--- | | **Series** | S501 (Fast-Acting) | | **Current Rating** | 5 Amperes | | **Voltage Rating (AC)** | 250 VAC | | **Interrupting Rating** | 1500A at 250VAC | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Size** | 5mm x 20mm (Miniature) | | **Compliance** | RoHS Compliant (indicated by the "-R" suffix) | --- ## 2. Key Features and Components ### Fast-Acting Characteristic The S501 is a **fast-acting (F)** fuse. Unlike "slow-blow" or "time-delay" fuses, this part is designed to open almost instantly when the current exceeds the 5A threshold. This makes it ideal for protecting sensitive semiconductor components and integrated circuits that cannot withstand even brief overcurrent spikes. ### Physical Construction * **The Tube:** Made of transparent glass, allowing for easy visual inspection to see if the internal filament has melted. * **The Element:** A precision-engineered metallic wire or strip designed to melt at a specific thermal energy level. * **The Endcaps:** Conductive caps that ensure low-resistance contact with fuse clips or holders. ### The "-R" Suffix In the Eaton/Bussmann naming convention, the **-R** indicates that the part is **RoHS (Restriction of Hazardous Substances) compliant**. This means it is lead-free and meets international environmental safety standards. --- ## 3. Common Applications Due to its small form factor and quick response time, the S501-5-R is frequently found in: 1. **Consumer Electronics:** Power supplies for laptops, monitors, and televisions. 2. **Industrial Equipment:** Control panels and PLC protection. 3. **Appliances:** Internal circuit protection for kitchen electronics. 4. **Test Equipment:** Multimeters and lab power supplies. --- ## 4. Part Number Breakdown `S501` - `5` - `R` * **S501:** Series name (Fast-acting, 5x20mm glass). * **5:** Rated current in Amperes. * **R:** RoHS compliant.