The **ABC-2-1/2-R** is a high-performance ceramic tube fuse manufactured by **Eaton (Bussmann Series)**. It is designed for electronic and electrical circuits requiring a fast-acting protection mechanism against overcurrent. --- ### 1. Key Technical Specifications The model name contains specific data regarding its performance characteristics: | Property | Value / Detail | | :--- | :--- | | **Product Series** | ABC Series | | **Amperage Rating** | 2.5 Amperes (2-1/2 A) | | **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" (6.35mm x 31.75mm) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Physical Characteristics The **ABC series** utilizes a **ceramic body** rather than a glass body. This provides several advantages: * **Higher Interrupting Rating:** Ceramic can withstand higher internal pressures, allowing it to safely break higher currents without shattering. * **Arc Suppression:** The tube is often filled with a granular material (like sand) to extinguish the electrical arc formed when the fuse blows. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in selecting replacements: * **ABC:** The series prefix (Ceramic tube, fast-acting). * **2-1/2:** The current rating (2.5 Amps). * **-R:** Lead-free and RoHS compliant. --- ### 4. Common Applications This fuse is typically found in: 1. **Industrial Controls:** Protecting PLCs and sensitive relay logic. 2. **Power Supplies:** Input protection for AC/DC converters. 3. **Electronic Instruments:** Used in lab equipment and measuring tools. 4. **Appliances:** High-end consumer electronics that require precise overcurrent protection. --- ### 5. Interrupting Rating (Breaking Capacity) One of the most critical "electronic" aspects of this part is its ability to stop a short circuit safely: * **At 250VAC:** 100 Amps * **At 125VAC:** 10,000 Amps (High capacity) ---