## Technical Overview: MDL-2/10-R The **MDL-2/10-R** is a specific model of a **Time-Delay Glass Tube Fuse** manufactured by Eaton (formerly Bussmann). It is widely used in electronic circuits to provide overcurrent protection, particularly in applications with high inrush currents. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Current Rating** | 0.2A (200mA) | | **Voltage Rating (AC)** | 250V | | **Fuse Type** | Time-Delay (Slow-Blow) | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Dimensions** | 1/4" x 1-1/4" (6.35mm x 31.75mm) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Electronic Characteristics #### Time-Delay Functionality Unlike "Fast-Acting" fuses, the MDL-2/10-R is designed to withstand temporary surges or "inrush currents." This is achieved through a specific internal construction—often a coiled wire or a weighted element—that takes longer to melt when exposed to a slight overload but will still blow instantly during a massive short circuit. #### Interrupting Rating The interrupting rating defines the maximum current the fuse can safely stop without physically exploding or arcing. For the MDL series at 250VAC, the interrupting rating is typically **35 Amps**. --- ### 3. Structural Components 1. **Glass Body:** Allows for visual inspection to see if the internal filament has melted. 2. **Conductive Caps:** Located at both ends, these provide the electrical connection to the fuse holder or clips. 3. **The "R" Suffix:** This is a critical part of the part number, signifying that the component is **RoHS (Restriction of Hazardous Substances) compliant**, meaning it is lead-free. --- ### 4. Common Applications Due to its 200mA rating and slow-blow characteristics, this fuse is commonly found in: * Small power supplies for consumer electronics. * Control circuits for HVAC systems. * Industrial instrumentation where inductive loads (like small motors or solenoids) cause initial current spikes.