The **3JS2-R** is a specific model of a **Miniature Surface Mount (SMT) Fuse**, part of the 3JS series manufactured by **Bel Fuse Inc.** This component is designed for board-level primary and secondary circuit protection. --- ### ## Technical Specifications Below are the primary electronic characteristics of the 3JS2-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 2 Amperes (A) | | **Voltage Rating (AC)** | 350V AC | | **Voltage Rating (DC)** | 140V DC | | **Fuse Speed** | Slow Blow / Time Delay | | **Package / Case** | 2AG / 5mm x 15mm | | **Termination Style** | Axial Leaded / Through-Hole (R-suffix indicates RoHS compliance) | | **Interrupting Rating** | 100A @ 350V AC | --- ### ### Key Features and Construction 1. **Time-Delay (Slow Blow) Characteristic:** The "Slow Blow" nature of the 3JS2-R allows it to withstand temporary surges or high-inrush currents (common in motors or power supply startups) without tripping, while still protecting against sustained overloads. 2. **Glass Tube Design:** The fuse typically features a glass body, allowing for visual inspection of the internal filament to confirm if the fuse has blown. 3. **RoHS Compliance:** The **"-R"** suffix denotes that the part is lead-free and meets the European Union’s RoHS (Restriction of Hazardous Substances) standards. 4. **Board-Level Integration:** While many 2AG fuses are used in clips, the axial leads on this model are designed to be soldered directly onto a Printed Circuit Board (PCB). --- ### ### Common Applications Due to its voltage rating and delay characteristics, the 3JS2-R is found in: * **Power Supplies:** Protecting the input stage from surges. * **Industrial Lighting:** Ballasts and LED drivers. * **Consumer Electronics:** Chargers and adapters. * **Monitors/Displays:** Protecting internal circuitry. --- ### ### Safety Standards The 3JS2-R is generally certified by major global safety agencies to ensure reliability: * **UL Listed** (Underwriters Laboratories) * **CSA Certified** (Canadian Standards Association) * **PSE Approved** (Jet/Japan)