The **3JS5-R** is a specific model of a **Miniature Cartridge Fuse** manufactured by Bel Fuse Inc. It belongs to the 3JS / 3JQ series, characterized by its "Slow Blow" (Time Delay) properties and glass tube construction. --- ## 1. Technical Specifications The table below outlines the core electronic parameters of the 3JS5-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 5 Amperes (5A) | | **Voltage Rating (AC)** | 350V AC | | **Voltage Rating (DC)** | 140V DC | | **Fuse Type** | Slow Blow / Time Delay | | **Material** | Glass Body / Nickel Plated Brass Caps | | **Size / Dimension** | 5mm x 15mm (2AG Equivalent) | | **Mounting Type** | Holder / Clip (Cartridge) | | **Termination Style** | Ferrule | --- ## 2. Key Features and Design ### Slow Blow (Time Delay) Mechanism Unlike "Fast Acting" fuses, the 3JS5-R is designed to withstand temporary surges or "inrush currents." This is crucial for devices that draw a high amount of power momentarily when turned on (like motors or large capacitors) but operate at a lower steady state. ### Material Construction * **Glass Tube:** Allows for easy visual inspection to see if the internal filament has melted (blown). * **R-Suffix:** The "R" in the part number typically denotes **RoHS Compliance**, meaning the part is lead-free and meets environmental safety standards. --- ## 3. Common Applications Due to its small form factor and 5A rating, the 3JS5-R is frequently found in: * **Consumer Electronics:** Power supplies for monitors and televisions. * **Industrial Equipment:** Small control panels and motor starters. * **Chargers:** Laptop power adapters and battery charging stations. * **LED Lighting:** Drivers that experience high initial inrush current. --- ## 4. Part Number Breakdown Understanding the Bel Fuse nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **3JS** | Series Name (5x15mm, Time Delay) | | **5** | Ampere Rating (5 Amps) | | **-R** | RoHS Compliant | ---