The **5MTP3-R** is a specific model of a **Miniature Cartridge Fuse** manufactured by Bel Fuse Inc. It is designed to protect electronic circuits from overcurrent conditions. ### 1. Technical Specifications The part number can be broken down to understand its core electronic characteristics: | Feature | Specification | | :--- | :--- | | **Type** | Time-Lag (Slow Blow) | | **Current Rating** | 3 Amperes (3A) | | **Voltage Rating (AC)** | 250V AC | | **Body Material** | Glass Tube | | **Dimensions** | 5mm x 20mm (Standard Miniature size) | | **Termination Style** | Axial Leaded (Pigtail) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Key Component Characteristics #### A. Time-Lag (Slow Blow) Functionality Unlike "Fast-Acting" fuses, the **5MTP3-R** is designed to withstand temporary surges in current. This is critical for circuits that experience high "inrush current" upon startup (such as motors or large power supplies) to prevent nuisance blowing. #### B. Axial Leads (Pigtail Design) The "P" in the part series usually denotes that this fuse has wire leads soldered to the end caps. * **Mounting:** It is intended for **Through-Hole** mounting directly onto a Printed Circuit Board (PCB). * **Permanent Installation:** Unlike clip-in cartridge fuses, these are typically soldered and are not meant to be replaced without desoldering. #### C. Glass Body Construction The transparent glass body allows for visual inspection. If the internal element is melted or the glass is darkened, it provides an immediate visual confirmation that the fuse has cleared (blown). --- ### 3. Common Applications The 5MTP3-R is typically found in the primary (AC input) stage of small-to-medium electronic devices: * **Power Supplies:** Protecting the device from internal shorts. * **Consumer Electronics:** Televisions, audio amplifiers, and chargers. * **Industrial Equipment:** Control boards that require a 3A threshold. --- ### 4. Safety Standards This part is typically certified by international safety agencies to ensure it fails safely under high-load conditions: * **UL Listed (North America)** * **CSA Certified (Canada)** * **PSE (Japan)**