The **5MTF800-R** is a specific electronic component belonging to the **fuses** category. Specifically, it is a 5x20mm glass tube fuse designed for circuit protection against overcurrent conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Part Number** | 5MTF800-R | | **Fuse Type** | Glass Tube (Cartridge) | | **Current Rating** | 800mA (0.8 Amps) | | **Voltage Rating** | 250V AC | | **Response Characteristic** | Medium Time-Delay (Medium Blow) | | **Size** | 5mm x 20mm | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Breakdown of the Part Name To understand the electronic properties, we can decode the part number suffix and prefix: * **5MT**: Indicates the series. "5" usually refers to the 5mm diameter, and "MT" signifies **Medium Time-Delay**. This means the fuse is designed to withstand temporary surges (like motor startups) without blowing immediately, but will trip if a sustained overcurrent occurs. * **800**: Represents the current rating in milliamperes (800mA). * **-R**: Indicates that the part is Lead-Free and complies with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 3. Electronic Function and Material * **Conductive Element:** Inside the glass tube is a wire or filament designed to melt at a specific temperature generated by 800mA of current. * **Arc Quenching:** The glass body allows for visual inspection to see if the fuse is "blown." It is designed to contain the electrical arc that occurs when the circuit is interrupted. * **Interrupting Rating:** This fuse typically has a low breaking capacity, meaning it is intended for use in consumer electronics rather than high-power industrial branch circuits. --- ### 4. Common Applications Due to its medium-blow characteristic and 800mA rating, it is commonly found in: * Power supplies for small appliances. * Audio/Video equipment. * Testing and measurement instruments. * Internal protection for PCB-mounted power modules.