The **S505H-5-R** is a specific type of high-performance electronic fuse manufactured by **Eaton (Bussmann Series)**. It is widely used in power supplies and industrial equipment to protect circuits against overcurrent conditions. ### 1. Technical Specifications The part number follows a specific naming convention that defines its electrical characteristics: | Parameter | Value / Specification | | :--- | :--- | | **Series** | S505H (High Breaking Capacity) | | **Current Rating** | 5 Amps | | **Voltage Rating (AC)** | 600V AC | | **Fuse Type** | Time-Delay / Slow-Blow | | **Material** | Ceramic Tube | | **Physical Size** | 5mm x 20mm | | **Termination Style** | Cartridge (Ferrule) | | **Breaking Capacity** | 1500A at 600VAC | --- ### 2. Key Features & Construction #### Ceramic Body Unlike standard glass fuses, the S505H uses a **ceramic tube**. Ceramic provides much higher thermal stability and can withstand higher internal pressures, allowing for a significantly higher interrupting (breaking) rating. #### Time-Delay (Slow-Blow) Characteristic The "Time-Delay" feature means the fuse is designed to ignore short-term current spikes (like the inrush current when a motor or power supply starts) but will blow if a sustained overcurrent occurs. This prevents "nuisance blowing." #### High Breaking Capacity The "H" in the series designation stands for High Breaking Capacity. It can safely interrupt a short circuit of up to **1500 Amps** without the fuse body shattering or causing an arc flash. --- ### 3. Common Applications The S505H-5-R is typically found in environments where safety and reliability are critical: * **LED Lighting Drivers:** Protecting against surge currents. * **Power Supplies (SMPS):** Used on the primary side of AC/DC converters. * **Industrial Controllers:** Protecting PLC outputs and sensitive instrumentation. * **Appliances:** High-end white goods that require robust overcurrent protection. --- ### 4. Part Number Breakdown ```text S505H - 5 - R | | | | | +-- RoHS Compliant | +------ Ampere Rating (5 Amps) +------------ Series Name (Ceramic, 5x20mm, Time-Delay) ```