The **MDL-2/10-R** is a specific electronic component belonging to the **MDL series**, which are **Time-Delay (Slo-Blo) Glass Tube Fuses**. These are commonly used in power supplies, consumer electronics, and industrial control circuits to provide overcurrent protection. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify its technical specifications: | Part Segment | Meaning | | :--- | :--- | | **MDL** | Series name (1/4" x 1-1/4" Time-Delay Glass Fuse) | | **2/10** | Current Rating: 0.2 Amperes (200mA) | | **-R** | RoHS Compliant (Lead-free) | --- ### 2. Key Technical Specifications Below are the primary electrical and physical characteristics of this part: | Characteristic | Specification | | :--- | :--- | | **Current Rating** | 200 mA (0.2A) | | **Voltage Rating** | 250 VAC | | **Fuse Type** | Time-Delay / Slow Blow | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Dimensions** | 6.3mm x 32mm (1/4" x 1-1/4") | | **Interrupting Rating** | 35A @ 250VAC / 10,000A @ 125VAC | | **Resistance (Nominal)** | ~2.31 Ohms | --- ### 3. Core Functional Components Electronic fuses like the MDL-2/10-R consist of three main internal parts: 1. **The Element:** A specially designed wire or strip. In "Time-Delay" fuses, the element is often coiled or has a "T-slug" (thermal mass) that allows short-duration surges (like motor startups) to pass without blowing. 2. **The Body:** A transparent glass tube. This allows for visual inspection to see if the internal wire has melted/broken. 3. **The Terminals:** The metal endcaps that provide the electrical connection to the fuse holder or clip. --- ### 4. Application Use Case The **Time-Delay** feature is critical for the MDL-2/10-R. Unlike "Fast-Acting" fuses, this part is designed to withstand a momentary inrush of current. * **Common Use:** Protecting low-power transformers or sensitive control circuits where a small surge occurs when the device is first turned on. * **Safety Standard:** It is typically UL Listed and CSA Certified, ensuring it meets rigorous safety standards for fire prevention.