The **MDA-14-R** is a high-performance ceramic fuse from the **MDA series**, manufactured by **Eaton (formerly Bussmann)**. It is specifically designed as a "Time-Delay" (Slow-Blow) fuse for heavy-duty industrial and electronic applications. --- ### 1. Key Technical Specifications The following table outlines the primary electrical and physical characteristics of the MDA-14-R: | Attribute | Specification | | :--- | :--- | | **Manufacturer** | Eaton (Bussmann Series) | | **Part Number** | MDA-14-R | | **Current Rating** | 14 Amperes | | **Voltage Rating (AC)** | 250 VAC | | **Voltage Rating (DC)** | 125 VDC (Varies by safety standard) | | **Fuse Type** | Ceramic Tube | | **Response Characteristic** | Time-Delay / Slow-Blow | | **Physical Size** | 1/4" x 1-1/4" (6.3mm x 32mm) | | **RoHS Compliant** | Yes ("R" suffix indicates RoHS) | --- ### 2. Physical Construction The **MDA** series differs from the common glass **MDL** series in its material composition: * **Ceramic Body:** The tube is made of high-strength ceramic. This allows the fuse to handle higher temperatures and higher "Interrupting Ratings" (breaking capacity) compared to glass. * **Filler Material:** The interior is often filled with granular sand (silica) to help quench the electrical arc when the fuse blows, preventing the casing from shattering. * **Nickel-Plated Brass Endcaps:** Ensure high conductivity and corrosion resistance. --- ### 3. Functional Characteristics #### Time-Delay (Slow-Blow) The "Time-Delay" feature is critical for circuits that experience **Inrush Current**. This means the fuse will not blow instantly if there is a brief surge (like a motor starting up), but it will blow if a sustained overload or a massive short circuit occurs. #### Interrupting Rating The MDA-14-R has a high interrupting rating, typically capable of safely stopping a current of: * **1500A** at 250VAC. * **10,000A** at 125VAC. --- ### 4. Common Applications Because of its durability and slow-acting nature, this fuse is commonly found in: * **Power Supplies:** Protecting input stages from surges. * **Industrial Control Panels:** Where high-capacity circuits are present. * **Motors and Transformers:** Equipment that draws high current during the first few milliseconds of operation. * **Amplifiers:** High-end audio equipment using large capacitors.