The **5ST500-R** is a specific type of electronic component—specifically a **Subminiature Fuse** from the **5ST series**, manufactured by companies like Bel Fuse Inc. It is designed for primary circuit protection in various electronic devices. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the 5ST500-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 500mA (0.5A) | | **Voltage Rating (AC)** | 250V | | **Fuse Type** | Time-Lag (Slow Blow) | | **Package / Case** | 5mm x 20mm (Cartridge) | | **Breaking Capacity** | 35A @ 250V AC | | **Termination Style** | Cartridge (Often Glass Tube) | | **RoHS Status** | Compliant (indicated by the "-R" suffix) | --- ### ### Key Components and Features 1. **Time-Lag (Slow Blow) Characteristic:** The "Time-Lag" designation means this fuse is designed to withstand temporary surges in current (inrush current) without blowing immediately. This is critical for devices like motors or power supplies that draw a large amount of power for a split second when turned on. 2. **The "-R" Suffix:** In modern electronics, the "-R" suffix typically denotes **RoHS (Restriction of Hazardous Substances) Compliance**, meaning the part is lead-free and environmentally friendly. 3. **Construction Material:** The 5ST series usually features a glass body with nickel-plated brass end caps. The transparent body allows for easy visual inspection to see if the internal filament has melted. --- ### ### Common Applications The 5ST500-R is widely used in low-power electronic protection, including: * **Power Supplies:** Protecting the input stage from overcurrent. * **Consumer Electronics:** Televisions, chargers, and audio equipment. * **Industrial Equipment:** Control panels and sensor circuits. * **Battery Chargers:** Preventing fire hazards during charging faults. --- ### ### Part Number Breakdown ```text 5ST - 500 - R | | | Series Rating RoHS Compliant (5x20mm (500mA) Time-Lag) ```