The **5HF2-R** is a specific model of a **Miniature Cartridge Fuse**. It is widely used in power supplies, consumer electronics, and industrial equipment to protect circuits from overcurrent conditions. ### 1. Technical Specifications The "5HF" series typically follows international standards (IEC 60127-2). Below are the core technical characteristics for this part: | Characteristic | Specification | | :--- | :--- | | **Fuse Type** | Miniature Cartridge (Ceramic Tube) | | **Speed/Response** | Fast-Acting (F) | | **Standard Size** | 5mm x 20mm | | **Voltage Rating** | 250V AC | | **Current Rating** | 2A (indicated by the "2" in the part number) | | **Breaking Capacity** | 1500A @ 250V AC | | **Material** | Ceramic Body, Nickel-plated Brass Caps | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying equivalent parts or replacements: 1. **5HF**: Represents the series name. In the Bel Fuse catalog, this denotes a **Ceramic Body, Fast-Acting** fuse with high breaking capacity. 2. **2**: This is the current rating. In this case, it is **2 Amperes**. 3. **-R**: Indicates that the part is **RoHS Compliant** (Lead-free). --- ### 3. Key Features & Applications #### Features * **High Breaking Capacity:** Unlike glass fuses, the ceramic body allows this fuse to interrupt much higher fault currents without the body shattering. * **Fast-Acting:** Designed to open quickly (typically within milliseconds) when an overload or short circuit occurs, protecting sensitive semiconductor components. * **Compact Form Factor:** The 5x20mm size is a global standard, making it easy to find holders and clips. #### Common Applications * **Power Supplies:** Used on the input side of AC/DC adapters. * **Consumer Electronics:** Televisions, audio equipment, and chargers. * **Industrial:** Protection for PLCs (Programmable Logic Controllers) and small motors. --- ### 4. Safety and Maintenance * **Replacement:** Always replace a 5HF2-R with a fuse of the same current and voltage rating. Never replace a ceramic fuse with a glass fuse of the same rating if the circuit requires high breaking capacity. * **Testing:** Use a multimeter in "Continuity" mode. If the meter beeps, the fuse is good. If it shows "OL" or no beep, the fuse is blown.