## MJS 2.5-R: Technical Specifications and Overview The **MJS 2.5-R** is a specific type of subminiature fuse manufactured by Bel Fuse Inc. It belongs to the MJS series, which are glass body, radial leaded, micro-fuses designed for space-saving protection on printed circuit boards (PCBs). --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the MJS 2.5-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 2.5 Amperes (A) | | **Voltage Rating** | 250V AC / 125V DC | | **Fuse Type** | Time-Lag (Slow Blow) | | **Body Material** | Glass | | **Termination Style** | Radial Leaded (Through-hole) | | **Interrupting Rating** | 200A @ 250V AC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Breakdown of the Model Name Understanding the nomenclature helps identify the specific part variation: * **MJS**: The series designation (Micro Jack, Slow-blow). * **2.5**: The rated current in Amperes. * **-R**: Indicates **RoHS compliance**, meaning the part is manufactured without hazardous substances like lead. --- ### 3. Functional Characteristics #### Slow-Blow (Time-Lag) Performance The "Time-Lag" characteristic means this fuse is designed to withstand temporary surges or inrush currents (common in motors or power supplies) without blowing immediately. It will only open the circuit if the overcurrent persists for a specific duration. #### Physical Form Factor Unlike standard 5x20mm glass fuses, the MJS series is **radial leaded**. This means: * It is soldered directly into the PCB. * It does not require a separate fuse holder, saving vertical and horizontal space. * The leads are typically spaced at 5mm intervals. --- ### 4. Common Applications Due to its small size and time-delay characteristics, the MJS 2.5-R is frequently used in: * Power adapters and chargers. * Consumer electronics (TVs, audio equipment). * Industrial controllers. * LED lighting ballasts.