The **GMD-2-R** is a specific model of a time-delay, glass tube fuse manufactured by **Eaton (Bussmann Series)**. It is widely used in electronic circuits to provide overcurrent protection for sensitive components. ### 1. Technical Specifications The part number "GMD-2-R" can be broken down to understand its electrical characteristics: | Characteristic | Specification | | :--- | :--- | | **Series** | GMD (Glass Tube, Time-Delay) | | **Current Rating** | 2 Amperes | | **Voltage Rating** | 250 VAC | | **Interrupt Rating** | 100A at 250VAC | | **Physical Size** | 5mm x 20mm | | **Material** | Glass Tube, Nickel-plated brass endcaps | | **Compliance** | RoHS Compliant (indicated by the "-R" suffix) | --- ### 2. Key Electronic Features #### A. Time-Delay (Slo-Blo) Function Unlike "Fast-Acting" fuses, the GMD series is designed with a **time-delay** characteristic. This allows the fuse to withstand temporary surge currents (inrush currents) that occur when a device is first turned on (e.g., charging capacitors or starting a small motor) without blowing prematurely. #### B. Construction * **Glass Body:** Allows for easy visual inspection to see if the internal filament has melted. * **5x20mm Standard:** This is a global standard size, making it easily replaceable in most fuse holders, clips, or power entry modules. #### C. RoHS Compliance The **-R** suffix signifies that the part is lead-free and meets the "Restriction of Hazardous Substances" directive, which is standard for modern electronic manufacturing. --- ### 3. Common Applications The GMD-2-R is typically found in the primary side of power supplies for: 1. **Consumer Electronics:** Televisions, audio equipment, and chargers. 2. **Industrial Equipment:** Small control circuits and PLCs. 3. **Appliances:** Microwaves or coffee makers where small inductive loads exist. --- ### 4. Safety and Replacement Notes > **Warning:** When replacing a GMD-2-R, always ensure the power is disconnected. Never replace a 2A fuse with a higher amperage fuse (e.g., 5A), as this removes the protection for your circuit and creates a fire hazard.