The **GMD-315-R** is a specific model of a **Time-Delay Glass Tube Fuse**. These components are critical safety devices used to protect electronic circuits from overcurrent conditions. --- ## 1. Technical Specifications The model name follows the industry standard nomenclature for Bel Fuse or Cooper Bussmann (Eaton) series. | Feature | Specification | | :--- | :--- | | **Part Number** | GMD-315-R | | **Current Rating** | 315 mA (0.315 Amps) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Dimensions** | 5mm x 20mm | | **Material** | Glass Body, Nickel-plated Brass End Caps | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ## 2. Key Electronic Characteristics ### Time-Delay (Slow-Blow) Function The "GMD" series is characterized by its **Time-Delay** property. Unlike "Fast-Acting" fuses, this part is designed to withstand temporary surges in current (inrush current) without blowing. This is essential for devices like motors or power supplies that draw a large amount of power for a split second when first turned on. ### Interrupting Rating This fuse typically has an interrupting rating (breaking capacity) of: * **35A at 250V AC** * **10,000A at 125V AC** This determines the maximum fault current the fuse can safely stop without physically exploding or arcing. ### The "-R" Suffix In modern electronics manufacturing, the suffix **-R** specifically denotes that the part is **RoHS Compliant** (Restriction of Hazardous Substances). This means the lead content in the solder and the plating on the end caps are within environmentally safe limits. --- ## 3. Common Applications Due to its 315mA rating and slow-blow nature, this part is frequently found in: 1. **Consumer Electronics:** Power adapters and small appliances. 2. **Industrial Controls:** Protecting delicate PLCs or sensors from minor spikes. 3. **Audio Equipment:** Amplifiers and high-end audio gear where startup surges are common. ---