The **5ST 2.5-R** is a specific model of electronic fuse manufactured by companies like **Bel Fuse Inc.** It belongs to the 5ST series, which are 5x20mm time-delay (slow-blow) fuses. --- ### ## Technical Specifications The following table highlights the core electrical and physical characteristics of the 5ST 2.5-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 2.5 Amperes (2.5A) | | **Voltage Rating (AC)** | 250 Volts | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Form Factor / Size** | 5mm x 20mm (Standard Glass Tube) | | **Breaking Capacity** | 35A @ 250V AC | | **Termination Style** | Cartridge (Ferrule) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### ### Key Features and Meaning of the Part Number 1. **5ST Series:** This identifies the product line. In the world of fuses, "5ST" denotes a **Time-Lag** (slow-blow) characteristic. This means the fuse is designed to withstand temporary current surges (like a motor starting up) without blowing immediately. 2. **2.5:** This represents the continuous current rating. The fuse will operate normally at or below 2.5 Amps. 3. **-R:** This suffix stands for **RoHS Compliant**, meaning the part is manufactured without lead or other hazardous substances restricted by environmental regulations. --- ### ### Common Applications Because this is a time-delay fuse, it is typically used in devices that experience "inrush current" upon startup. Common applications include: * **Power Supplies:** Protecting against initial capacitor charging spikes. * **Consumer Electronics:** Televisions, audio amplifiers, and monitors. * **Industrial Equipment:** Small motors or solenoid-driven devices. * **Chargers:** Battery charging units where current may fluctuate. --- ### ### Safety and Compliance The 5ST 2.5-R is typically certified by international safety agencies to ensure reliability: * **UL/CSA:** Standard safety ratings for North America. * **VDE / Semko:** European safety standards. * **IEC 60127-2:** It conforms to Sheet 3 of the international standard for miniature fuses.