The **RJS1-R** is a specific part number typically associated with high-quality, high-reliability **Radial Lead Fuses** manufactured by **Bel Fuse Inc.** This component is widely used in power supplies, telecommunications equipment, and consumer electronics to provide overcurrent protection. ### 1. Key Technical Specifications The "RJS" series is characterized by its rectangular, molded plastic body and radial leads. Below are the typical specifications for the RJS1-R: | Specification | Value/Description | | :--- | :--- | | **Component Type** | Radial Lead Fuse (Through-hole) | | **Current Rating** | 1 Ampere (indicated by the '1' in RJS1) | | **Voltage Rating** | 600V AC (Standard for this series) | | **Fuse Speed** | Slow Blow / Time Delay | | **Breaking Capacity** | 60A @ 600V AC | | **Operating Temperature** | -55°C to +125°C | | **Compliance** | RoHS 6 Compliant ('-R' suffix) | --- ### 2. Suffix Breakdown Understanding the part number code is essential for sourcing the correct replacement: * **RJS**: The series name (Rectangular, Radial lead). * **1**: The current rating (1.0 Amp). * **-R**: Indicates **RoHS compliance** (lead-free). If the "-R" is followed by more letters (e.g., `-R TR`), it may indicate packaging like **Tape and Reel**. --- ### 3. Key Features and Applications The RJS1-R is preferred in industrial settings due to its physical durability and electrical characteristics: * **Slow Blow Design**: This allows the fuse to withstand temporary "inrush currents" (spikes that occur when a device is first turned on) without blowing, but it will still trip if a sustained overcurrent occurs. * **High Voltage Rating**: Rated at 600V, it is suitable for AC power line protection where lower-voltage fuses (like 125V or 250V) would be unsafe. * **Space Saving**: The radial (vertical) mounting occupies less PCB real estate compared to traditional horizontal glass tube fuses. #### Typical Applications: * AC/DC Power Adapters * Battery Chargers * Industrial Controllers * Telecom line protection --- ### 4. Safety Standards The RJS series is generally certified by major international safety bodies to ensure fire and shock protection: * **UL** (Underwriters Laboratories) * **CSA** (Canadian Standards Association) * **PSE** (Japan Electrical Safety)