The **3JS3-R** is a specific electronic component typically identified as a **Radial Lead, Subminiature Square Slow-Blow Fuse**. It is part of the "3JS" series manufactured by Bel Fuse Inc. and is designed for space-constrained circuit protection. --- ### ## Technical Specifications Below are the primary electronic characteristics of the 3JS3-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 3 Amperes (3A) | | **Voltage Rating** | 350V AC / 140V DC | | **Fuse Type** | Slow-Blow (Time-Delay) | | **Body Style** | Radial Lead (Subminiature Square) | | **Material** | Thermoplastic Body / Tin-plated Copper Leads | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | | **Interrupting Rating** | 100A @ 350V AC | --- ### ## Key Features & Construction * **Time-Delay Characteristic:** Unlike fast-acting fuses, the 3JS3-R is designed to withstand temporary power surges or "inrush currents" without blowing. This makes it ideal for devices with motors or capacitive loads. * **Form Factor:** It uses a subminiature square design (often referred to as a "micro fuse" or "TE5/TR5" style). This saves significant PCB real estate compared to traditional glass tube fuses. * **The "-R" Suffix:** In electronic part numbering, the "-R" denotes **RoHS Compliance**, meaning the part is lead-free and meets environmental safety standards. --- ### ## Applications The 3JS3-R is commonly found in the following electronic environments: 1. **Power Supplies:** Protecting the input stage of AC/DC adapters. 2. **Consumer Electronics:** Televisions, chargers, and LED drivers. 3. **Industrial Controllers:** Protecting sensitive circuitry from overcurrent while allowing for operational spikes. 4. **Battery Chargers:** Providing safety against short circuits. --- ### ## Installation and Safety * **Mounting:** These are through-hole components. They are often soldered directly to the PCB, though they can be used with specialized fuse holders for easy replacement. * **Safety Standards:** Typically carries certifications from **UL (Underwriters Laboratories)** and **CSA**, ensuring it meets rigorous safety standards for fire and electrical hazards.