The **MDA-30A-R** is a specific model of a high-performance, high-breaking capacity fuse, typically manufactured by **Eaton (Bussmann Series)**. It is part of the MDA family of ceramic tube fuses designed for industrial and power supply applications. --- ## 1. Technical Specifications The following table summarizes the key electronic characteristics of the MDA-30A-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 30 Amperes | | **Voltage Rating (AC)** | 250 VAC | | **Voltage Rating (DC)** | 125 VDC (Typical) | | **Interrupting Rating** | 1,500A @ 250VAC | | **Fuse Speed** | Time-Delay / Slow-Blow | | **Body Material** | Ceramic Tube | | **Contact Material** | Nickel-plated Brass Endcaps | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ## 2. Key Features and Construction ### Ceramic Body Design Unlike glass fuses, the MDA series uses a **ceramic tube**. Ceramic is significantly stronger and can withstand higher internal pressures and temperatures. This allows the fuse to have a much higher **Interrupting Rating** (the ability to safely stop a high-current short circuit without exploding). ### Time-Delay (Slow-Blow) Characteristics The MDA-30A-R is designed to handle temporary "inrush" currents. - It will not blow immediately if there is a brief surge (like a motor starting). - It will blow if the overcurrent persists, protecting the downstream electronics from sustained damage. ### The "-R" Suffix In the Eaton/Bussmann naming convention, the **-R** stands for **RoHS Compliant**. This means the part is manufactured without lead or other hazardous substances restricted by European environmental standards. --- ## 3. Common Applications The MDA-30A-R is frequently used in environments where high current and high reliability are required: * **Industrial Control Panels:** Protecting PLC outputs and motor starters. * **Power Supplies:** Main input protection for high-wattage AC/DC converters. * **Battery Chargers:** Handling high-current charging cycles. * **HVAC Systems:** Protecting fan motors and compressors. --- ## 4. Equivalent Part Numbers If the MDA-30A-R is unavailable, common equivalents include: 1. **Littelfuse:** 326 Series (e.g., 0326030.HXP) 2. **Bel Fuse:** Type GBP (e.g., GBP 30-R)