The **5ST630-R** is a specific electronic component manufactured by **Littelfuse**, belonging to the **5ST** series of glass body cartridge fuses. These fuses are designed according to international standards (IEC 60127-2, Sheet 3) and are commonly used in power supplies, consumer electronics, and industrial controllers. --- ## Technical Specifications | Parameter | Specification | | :--- | :--- | | **Fuse Type** | Glass Body Cartridge | | **Current Rating** | 630 mA (0.63 Amps) | | **Voltage Rating** | 250 VAC | | **Speed/Characteristic** | Time-Lag (Slow Blow) / "T" Characteristic | | **Size/Dimensions** | 5mm x 20mm | | **Interrupting Rating** | 35A @ 250VAC | | **Termination Style** | Cartridge (Ferrule) | | **RoHS Compliant** | Yes | --- ## Key Features ### 1. Time-Lag (Slow Blow) Characteristic The "R" suffix in the part number often indicates RoHS compliance, but the core characteristic is the **Time-Lag** (denoted by 'T'). Unlike "Fast-Acting" fuses, the 5ST630-R can withstand brief surges or "inrush currents" without blowing. This is essential for devices with capacitors or small motors that draw a spike of power when first turned on. ### 2. Glass Body Construction The transparent glass body allows for easy visual inspection. If the fuse has blown, a technician can often see the melted filament or dark scorch marks inside the tube. ### 3. Standard 5x20mm Form Factor This is one of the most common fuse sizes worldwide. It is designed to fit into standard fuse holders, clips, or PCB-mounted fuse blocks. --- ## Typical Applications * **Power Supplies:** Protecting the primary side of AC/DC adapters. * **Consumer Electronics:** Televisions, audio equipment, and chargers. * **Industrial Equipment:** Control panels and low-current sensors. * **LED Lighting:** Protecting driver circuits from overcurrent conditions. --- ## Part Number Breakdown (Littelfuse 5ST Series) | Part Segment | Meaning | | :--- | :--- | | **5ST** | Series Name (Time-Lag, 5x20mm, IEC Standard) | | **630** | Amperage Rating (630 mA) | | **-R** | RoHS Compliant (Lead-free and environmentally friendly) |