The **S506-4-R** is a specific model of an electronic fuse manufactured by **Eaton (Bussmann Series)**. It is a high-quality, time-delay (slow-blow) miniature glass tube fuse used to protect electronic circuits from overcurrent conditions. --- ### Technical Specifications The table below outlines the core electronic characteristics of the S506-4-R: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Eaton / Bussmann | | **Series** | S506 (Time-delay / Slow-blow) | | **Current Rating** | 4 Amperes (4A) | | **Voltage Rating (AC)** | 250 VAC | | **Fuse Size** | 5mm x 20mm (Standard Miniature) | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Interrupt Rating** | 40A at 250VAC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### Key Electronic Attributes #### 1. Time-Delay (Slow-Blow) Characteristic The S506 series is designed with "Time-Delay" capabilities. Unlike "Fast-Acting" fuses, this part can withstand temporary surges of current (inrush current) that occur when a device first starts up (e.g., charging capacitors or starting a motor). It will only blow if the overcurrent persists. #### 2. The "-R" Suffix In the Eaton/Bussmann naming convention, the **-R** stands for **RoHS Compliant**. This means the part is manufactured without the use of hazardous substances like lead, making it suitable for modern environmental standards and global distribution. #### 3. Interrupting Rating The fuse has an interrupting rating of 40A at 250VAC. This is the maximum current that the fuse can safely interrupt without physically exploding or arcing over. --- ### Common Applications Due to its 5x20mm size and time-delay nature, the S506-4-R is commonly found in: * **Power Supplies:** Protecting the input stage from spikes. * **Consumer Electronics:** Televisions, audio amplifiers, and chargers. * **Industrial Controls:** Small motors or control boards where startup current is higher than the running current. --- ### Identification and Replacement When replacing this part, ensure the markings on the metal endcap match: ```text T4A L 250V ``` * **T**: Time-delay (Slow-blow) * **4A**: 4 Amps * **L**: Low breaking capacity * **250V**: Maximum operating voltage