The **C519-250-R** is a specific type of electronic component, primarily known as a **Subminiature Glass Tube Fuse**. It is manufactured by Eaton (formerly Bussmann) and is widely used in power supplies and industrial equipment to protect circuits from overcurrent conditions. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Product Series** | C519 (5mm x 15mm) | | **Current Rating** | 250mA (0.25 Amps) | | **Voltage Rating** | 250V AC | | **Fuse Speed** | Slow-Blow / Time-Delay (T) | | **Body Material** | Glass Tube | | **Interrupting Rating** | 35A at 250V AC / 10,000A at 125V AC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Physical Construction The C519 series is distinct due to its physical size and "Axial Lead" availability (though the base part is often used in clips). * **Dimensions:** 5mm diameter by 15mm length. This is smaller than the standard 5x20mm fuses, making it ideal for compact electronic assemblies. * **Termination:** Typically ferrule-ended (nickel-plated brass caps), designed to fit into fuse clips or holders on a PCB. * **Visible Element:** Because it is made of glass, the internal fuse wire is visible, allowing for quick visual inspection to see if the fuse has blown. --- ### 3. Key Characteristics: Time-Delay (Slow-Blow) The "Slow-Blow" nature of this fuse is critical for specific electronic applications: * **Inrush Tolerance:** It is designed to withstand temporary surges in current (like when a motor starts or a capacitor charges) without blowing. * **Thermal Trip:** It uses a spring-loaded or thicker filament designed to heat up over a longer period compared to "Fast-Acting" fuses. --- ### 4. Common Applications Due to its 250mA rating and slow-blow characteristics, you will typically find the C519-250-R in: 1. **Consumer Electronics:** Power adapters for low-power devices. 2. **LED Lighting:** Drivers that experience a high initial inrush current. 3. **Industrial Controls:** Protecting control circuits and PLCs. 4. **Chargers:** Small battery charging circuits.