## Technical Overview of the GMA-2.5-R The **GMA-2.5-R** is a specific type of electronic component used primarily for circuit protection. It is a **fast-acting glass tube fuse** designed to protect electronic devices from overcurrent conditions. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Cartridge Fuse | | **Current Rating** | 2.5 Amps | | **Voltage Rating (AC)** | 250 Volts | | **Speed/Response Time** | Fast-Acting (F) | | **Body Material** | Glass Tube | | **End Cap Material** | Nickel-plated brass | | **Dimensions** | 5mm x 20mm | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Breakdown of the Model Name Understanding the nomenclature helps identify the part's characteristics: * **GMA:** The series designation, representing a 5x20mm fast-acting glass fuse. * **2.5:** The maximum continuous current the fuse can handle (2.5 Amperes). * **-R:** Indicates that the part is **RoHS compliant** (lead-free and environmentally friendly). --- ### 3. Electrical Characteristics * **Fast-Acting Performance:** Unlike "Slow-Blow" (Time-Delay) fuses, the GMA-2.5-R is designed to open (blow) very quickly when the current exceeds its rating. This is crucial for sensitive electronics that cannot withstand even brief surges. * **Interrupting Rating:** This fuse typically has an interrupting rating of 35A at 250V AC and 10,000A at 125V AC. This is the maximum current the fuse can safely stop without physically exploding or arcing. * **Resistance:** It has a low internal resistance to minimize voltage drop across the fuse during normal operation. --- ### 4. Common Applications Because of its small size (5x20mm) and fast response time, the GMA-2.5-R is commonly found in: * **Consumer Electronics:** Radios, DVD players, and older television sets. * **Power Supplies:** Used on the primary or secondary side of AC/DC adapters. * **Test Equipment:** Multimeters and oscilloscopes. * **Lighting Fixtures:** Small ballasts and LED drivers. --- ### 5. Identification and Safety When replacing this part, ensure the glass is clear and the internal wire filament is intact. If the glass is blackened or the wire is broken, the fuse has blown. **Warning:** Always replace a GMA-2.5-R with a fuse of the exact same amperage and voltage rating. Replacing a fast-acting fuse with a slow-blow fuse could result in permanent damage to your device.