The code **PCB-1/2-R** typically refers to a specific series of **Subminiature Fuses** (often radial-leaded) manufactured by brands like **Eaton (Bussmann Series)**. These are widely used for overcurrent protection on printed circuit boards where space is limited. --- ### 1. Key Technical Specifications The "1/2" in the part number signifies the amperage rating (0.5 Amps). | Feature | Specification | | :--- | :--- | | **Current Rating** | 0.5A (1/2 Amp) | | **Voltage Rating** | 250 VAC | | **Interrupting Rating** | 50A at 250 VAC | | **Fuse Type** | Fast-Acting | | **Body Material** | Thermoplastic / Glass / Ceramic (Series dependent) | | **Termination** | Radial Leaded (Through-hole) | | **RoHS Compliant** | Yes (Indicated by the **-R** suffix) | --- ### 2. Component Breakdown The part number can be broken down to understand its characteristics: * **PCB**: Designates the series, specifically designed for direct mounting onto Printed Circuit Boards. * **1/2**: The Ampere rating. In this case, it is a **0.5 Amp** fuse. * **-R**: Indicates **RoHS compliance**, meaning the part is lead-free and meets environmental safety standards. --- ### 3. Application and Usage These components are critical for protecting sensitive electronic circuits from short circuits and overcurrent conditions. * **Consumer Electronics:** Power supplies, chargers, and LED drivers. * **Industrial:** Control boards and small motor circuits. * **Form Factor:** Because they are radial-leaded, they stand upright on the PCB, saving horizontal "real estate" compared to traditional 5x20mm glass fuses. --- ### 4. Circuit Symbol and Footprint In schematic design (like Altium, KiCad, or Eagle), the part is represented as follows: ```text [ Fuse Symbol ] -----[ ~~~~~ ]----- 0.5A ``` **Footprint Note:** Usually requires two holes spaced approximately **5.08mm (0.2 inches)** apart, though you should always verify with the specific manufacturer datasheet for the "PCB" series pitch.