### Overview of GMD-1-R The **GMD-1-R** is a specific model of subminiature, time-delay (slow-blow) glass tube fuse. It is part of the GMD series manufactured by **Eaton (formerly Bussmann)**. These fuses are designed to protect electronic circuits from overcurrent and short-circuit conditions. --- ### Technical Specifications The table below outlines the primary electronic characteristics of the GMD-1-R: | Attribute | Specification | | :--- | :--- | | **Current Rating** | 1 Ampere (1A) | | **Voltage Rating (AC)** | 250 VAC | | **Fuse Type** | Time-Delay (Slow-Blow / Time-Lag) | | **Body Material** | Glass Tube with Nickel-plated Brass End Caps | | **Physical Size** | 5mm x 20mm (Standard Small Dimension) | | **Interrupting Rating** | 35A at 250VAC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### Key Design Features #### 1. Time-Delay Functionality The "GMD" series is engineered with a **time-delay** characteristic. Unlike "Fast-Acting" fuses that blow instantly, the GMD-1-R can withstand brief temporary surges or "inrush currents." This is essential for circuits containing inductive loads (like small motors or transformers) that require a spike of power to start up. #### 2. The "-R" Suffix The "-R" at the end of the part number signifies **RoHS Compliance**. This means the electronic component is manufactured without the use of lead or other hazardous substances restricted by European environmental standards. #### 3. Construction - **Glass Body:** Allows for easy visual inspection to see if the internal element has melted. - **5x20mm Form Factor:** This is the most common international standard for small electronic equipment, making it highly compatible with various fuse holders and PCB clips. --- ### Common Applications The GMD-1-R is typically found in: * **Power Supplies:** Protecting the input stage from surges. * **Consumer Electronics:** Chargers, monitors, and audio equipment. * **Industrial Controls:** Small control panels and PLC (Programmable Logic Controller) protection. --- ### Typical Internal Part Numbering ```text GMD - 1 - R | | | | | +-- RoHS Compliant | +------ Amperage Rating (1 Amp) +----------- Series Name (Time-Delay, 5x20mm) ```