The **GMA-15-R** is a specific model of fast-acting glass tube fuse manufactured by **Eaton (Bussmann Series)**. It is widely used in consumer electronics and industrial equipment to protect circuits from overcurrent conditions. ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the GMA-15-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 15 Amperes | | **Voltage Rating (AC)** | 125 Volts | | **Interrupting Rating** | 100A at 125Vac | | **Response Time** | Fast-Acting (F) | | **Material** | Glass Tube with Nickel-plated brass endcaps | | **Dimensions** | 5mm x 20mm (Standard small dimension) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Key Component Details #### A. Fast-Acting Characteristic Unlike "Slow-Blow" fuses, the GMA-15-R is designed to open (blow) very quickly when the current exceeds 15A. This protects sensitive electronic components that cannot withstand even brief surges. #### B. The "R" Suffix The "R" in the part number stands for **RoHS Compliant**. This means the part is manufactured without the use of lead or other hazardous substances, making it compliant with modern environmental regulations. #### C. Physical Construction * **Glass Body:** Allows for easy visual inspection to see if the internal filament has melted. * **5x20mm Size:** This is a global standard size, often referred to as a "miniature fuse." It is smaller than the 6.3x32mm (1/4" x 1-1/4") fuses commonly found in older North American automotive or heavy industrial applications. --- ### 3. Common Applications Because of its 15A rating and fast response, this part is frequently found in: 1. **Power Supplies:** Protecting the input stage of AC/DC converters. 2. **Consumer Electronics:** Amplifiers, older television sets, and high-end audio equipment. 3. **Control Circuits:** Protecting PLCs or small motors in industrial control panels. 4. **Appliances:** Microwave ovens and kitchen electronics. --- ### 4. Safety and Replacement Warning When replacing a GMA-15-R, ensure the replacement matches all three critical parameters: 1. **Amperage (15A):** Never use a higher amp fuse. 2. **Voltage (125V or higher):** You can use a 250V fuse in a 125V circuit, but never the reverse. 3. **Speed (Fast-Acting):** Replacing a fast-acting fuse with a slow-blow (GDC or GMC series) can lead to equipment damage during a fault.