The **5HTP250-R** is a specific model of a subminiature, slow-blow (time-delay) fuse, typically manufactured by **Bel Fuse Inc.** This component is designed for primary circuit protection in various electronic devices. --- ### ## Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics. | Feature | Specification | | :--- | :--- | | **Series** | 5HTP | | **Current Rating** | 250mA (0.25 Amps) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Delay (Slow-Blow) | | **Body Material** | Glass Tube | | **Mounting Type** | Through-Hole (Pigtail Leads) | | **Interrupting Rating** | 1500A @ 250V AC | | **Dimensions** | 5mm x 20mm (Standard Small Cartridge) | --- ### ### Key Electronic Characteristics 1. **Time-Delay (Slow-Blow) Functionality:** The "T" in the series indicates a time-delay characteristic. Unlike "Fast-Acting" fuses, the 5HTP250-R is designed to withstand temporary current surges (inrush current) that occur when a device is first turned on, without blowing immediately. 2. **Pigtail Lead Design ("-R"):** The "R" suffix often denotes RoHS compliance and, in this specific series, signifies the **pigtail lead** configuration. Instead of being placed in a fuse clip, the leads are soldered directly into the Printed Circuit Board (PCB). 3. **High Interrupting Capacity:** Despite its small size, it has a high breaking capacity, meaning it can safely interrupt a high fault current (up to 1500A) without exploding or causing a fire hazard. --- ### ### Typical Applications Because of its slow-blow nature and 250V rating, this part is commonly found in: * **Power Supplies:** Protecting the input stage from short circuits. * **LED Lighting:** Handling the initial surge when capacitors charge. * **Consumer Electronics:** Chargers, monitors, and small appliances. * **Industrial Controllers:** Protecting sensitive circuitry from line voltage fluctuations. --- ### ### Safety Standards The 5HTP series is generally built to meet international standards to ensure reliability: * **UL/CSA Listed:** Certified for safety in North American markets. * **IEC 60127-2:** Compliant with international fuse standards. * **RoHS Compliant:** Lead-free and environmentally friendly.