The **GMD-1.6-R** is a specific model of a subminiature, time-delay (slow-blow) glass tube fuse. It is commonly used in consumer electronics, power supplies, and industrial equipment to protect circuits from overcurrent conditions. --- ### 1. Technical Specifications The "GMD" series follows the UL 248-14 standard for supplementary overcurrent protection. | Parameter | Specification | | :--- | :--- | | **Current Rating** | 1.6 Amperes (1.6A) | | **Voltage Rating** | 250 VAC (Alternating Current) | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Physical Size** | 5mm x 20mm | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Interrupting Rating** | 35A @ 250VAC / 10,000A @ 125VAC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Key Electronic Components & Features #### A. The Fusible Element Inside the glass tube is a specially designed wire element. Unlike "fast-acting" fuses that pop instantly, the GMD-1.6-R element is engineered with more thermal mass. This allows it to withstand temporary **inrush currents** (surges) that occur when a device is first turned on, without blowing. #### B. The "-R" Suffix The **-R** indicates that the part is **RoHS compliant**. This means the materials used (including the solder and plating) are free from hazardous substances like lead, cadmium, and mercury, meeting modern environmental safety standards. #### C. Glass Body Construction The transparent glass body allows for easy visual inspection. If the fuse is blown due to a major short circuit, the glass may appear charred or the internal wire will be visibly broken. --- ### 3. Common Applications Due to its 1.6A rating and slow-blow characteristic, it is typically found in: * **Power Adapters:** Protecting against internal component failure. * **LED Drivers:** Handling the initial surge of capacitors. * **Small Appliances:** Where motors or transformers create brief power spikes. --- ### 4. Comparison: GMD vs. GMA It is important not to confuse the **GMD** series with the **GMA** series: * **GMA:** Fast-acting (blows immediately). * **GMD:** Time-delay (waits a few milliseconds to ensure the overcurrent is a fault, not a normal surge).