The part number **M8CD-5556-R** refers to a specific series of **Automotive Mini Fuses** (often categorized under the JCASE or M8 format), typically manufactured by companies like **Littelfuse** or **Cooper Bussmann** (Eaton). Below is a detailed breakdown of the electronic specifications and characteristics of this component. --- ## 1. Product Overview The M8CD series is a high-current, space-saving cartridge fuse designed primarily for automotive power distribution. It is engineered to protect high-current circuits against short circuits and over-current conditions. | Attribute | Specification | | :--- | :--- | | **Component Type** | Cartridge Fuse (M8 / JCASE Style) | | **Current Rating** | 60 Amperes (indicated by the '5556' or color coding) | | **Voltage Rating** | 32V DC (Standard Automotive) | | **Mounting Type** | Plug-in / Cartridge | | **Compliance** | RoHS Compliant, SAE J2077 | --- ## 2. Key Technical Specifications ### A. Current and Voltage * **Interrupting Rating:** 1000A @ 32V DC. * **Voltage Drop:** Typically very low (approx. 70-100mV) to minimize heat generation during operation. * **Operating Temperature:** Ranges from **-40°C to +125°C**, making it suitable for engine bay environments. ### B. Physical Construction * **Body Material:** High-temperature plastic (often Nylon or Polycarbonate) to prevent melting during a fault. * **Terminals:** Copper alloy with tin plating for optimal conductivity and corrosion resistance. * **Color Coding:** The "Blue" housing typically signifies a 60A rating in the JCASE/M8 standard. --- ## 3. Time-Current Characteristics This part is designed as a **slow-blow (time-delay)** fuse. This allows for temporary inrush currents (such as starting a motor) without blowing the fuse, while still protecting against sustained overloads. | Overload Percentage | Opening Time (Minimum) | Opening Time (Maximum) | | :--- | :--- | :--- | | 110% | 100 Hours | N/A | | 135% | 60 Seconds | 1,800 Seconds | | 200% | 4 Seconds | 60 Seconds | | 350% | 0.2 Seconds | 7 Seconds | --- ## 4. Typical Applications These fuses are found in automotive Power Distribution Boxes (PDB) for high-load systems: 1. **Cooling Fans:** Protecting the radiator fan motors. 2. **ABS Systems:** Providing high-current power to anti-lock braking pumps. 3. **Power Steering:** Electronic Power Steering (EPS) modules. 4. **Blower Motors:** High-speed HVAC fan circuits. --- ## 5. Part Number Decoding (General) While naming conventions vary slightly by brand, the M8CD-5556-R usually follows this logic: * **M8/JCASE:** Refers to the physical form factor (Cartridge). * **5556:** Internal manufacturer code for the 60A current profile. * **-R:** Indicates RoHS compliance (Lead-Free). ---