## Technical Overview: S505SC-2.5-R The **S505SC-2.5-R** is a high-performance, time-delay ceramic tube fuse manufactured by **Eaton (Bussmann Series)**. It is designed specifically for applications requiring high breaking capacity in a compact form factor. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Rated Current** | 2.5 Amperes | | **Voltage Rating (AC)** | 250 VAC | | **Fuse Type** | Time-Delay (Slow Blow) | | **Body Material** | Ceramic | | **Dimensions** | 5mm x 20mm | | **Breaking Capacity** | 1500A @ 250VAC | | **Termination Style** | Cartridge (Ferrule) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Detailed Component Breakdown #### A. Time-Delay Characteristic The "S505SC" series features a **Time-Delay** (often called "Slow-Blow") mechanism. This allows the fuse to withstand temporary current surges (inrush currents) common in motors or power supplies without blowing, while still protecting against sustained overloads or short circuits. #### B. Ceramic Construction Unlike glass fuses, the ceramic body allows for a significantly higher **Interrupting Rating** (Breaking Capacity). In the event of a catastrophic failure, the ceramic body can withstand much higher internal pressure and heat without shattering. #### C. High Breaking Capacity With a rating of **1500A**, this fuse can safely interrupt very high fault currents. This is critical in industrial environments where the potential energy behind a short circuit is substantial. --- ### 3. Part Number Suffix Meanings * **S505**: The base series (5x20mm high-breaking capacity ceramic). * **SC**: Often denotes specific plating or internal construction variations (typically axial leads are "S505-V", while cartridge is standard). * **2.5**: The amperage rating (2.5 Amps). * **-R**: Indicates the part is lead-free and **RoHS compliant**. --- ### 4. Typical Applications * **Power Supplies:** Protecting the input stage of AC-DC converters. * **Industrial Control:** Protection for PLCs and small motor controllers. * **Consumer Electronics:** High-end appliances that experience surge currents at startup. * **LED Lighting:** Drivers that require high-reliability circuit protection.