The **ABC-20-R** is a high-performance, fast-acting ceramic tube fuse manufactured by Eaton (under the Bussmann series). It is widely used in power supplies, monitors, and industrial control circuits where quick interruption of an electrical fault is required. --- ### ## Technical Specifications The following table outlines the primary electrical and physical characteristics of the ABC-20-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 20 Amps | | **Voltage Rating (AC)** | 250 Vac | | **Voltage Rating (DC)** | 125 Vdc | | **Fuse Type** | Fast-Acting (F) | | **Material** | Ceramic Tube, Nickel-plated Brass Endcaps | | **Dimensions** | 1/4" x 1-1/4" (6.3mm x 32mm) | | **Interrupt Rating** | 400A at 250Vac; 10,000A at 125Vac/dc | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### ### Key Components and Features 1. **Ceramic Body:** Unlike glass fuses, the ceramic body allows for a higher interrupting rating. This means the fuse can safely clear a much higher short-circuit current without the tube shattering. 2. **Fast-Acting Response:** The internal element is designed to melt very quickly when the current exceeds the 20A threshold. This protects sensitive electronic components that cannot withstand overcurrent surges for long durations. 3. **The "-R" Suffix:** This specific designation indicates that the part is **RoHS compliant**, meaning it is manufactured without hazardous substances like lead. 4. **Endcaps:** The nickel-plated brass endcaps ensure high conductivity and corrosion resistance when mounted in fuse clips or holders. ### ### Common Applications * **Industrial Controls:** Protecting PLCs and automation hardware. * **Power Supplies:** Serving as the primary input protection. * **Electronic Instruments:** Used in lab equipment and measuring devices. * **Appliances:** High-draw appliances requiring specific 20A protection. --- ### ### Comparison: ABC vs. AGC Series | Feature | ABC Series (Ceramic) | AGC Series (Glass) | | :--- | :--- | :--- | | **Body Material** | Opaque Ceramic | Clear Glass | | **Safety** | Higher burst resistance | Lower burst resistance | | **Visibility** | Cannot see if blown | Filament is visible | | **Typical Use** | High-current/Higher safety | General purpose |