## FPK-R-1.25A Electronic Component Overview The **FPK-R-1.25A** is a specific type of high-reliability, subminiature fuse typically used in aerospace, military, and high-performance industrial applications. It is part of the **FPK Series** produced by manufacturers like Eaton (Bussmann). --- ### 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | Fast-Acting Fuse | | **Current Rating** | 1.25 Amperes (A) | | **Voltage Rating** | 125 Volts AC / DC | | **Interrupting Rating** | 50A at 125V AC/DC | | **Response Time** | Fast-Acting (F) | | **Mounting Type** | Through-Hole (Radial Leads) | | **Material** | Ceramic body with tin-plated leads | --- ### 2. Key Features and Construction * **Subminiature Design:** The "R" in the part number often denotes a radial lead configuration, making it suitable for high-density Printed Circuit Board (PCB) layouts where space is limited. * **Fast-Acting Characteristic:** This fuse is designed to open very quickly (within milliseconds) when an overcurrent condition occurs. This protects sensitive semiconductor components that cannot withstand prolonged surges. * **Environmental Resilience:** These components are often built to meet military-grade standards (MIL-PRF-23419), meaning they can withstand significant vibration, shock, and thermal cycling. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variations: | Segment | Meaning | | :--- | :--- | | **FPK** | Series designation (High-reliability subminiature) | | **R** | Radial leaded configuration (vertical mounting) | | **1.25A** | Rated current capacity (1.25 Amps) | --- ### 4. Common Applications Due to its reliability and fast response time, the FPK-R-1.25A is commonly found in: * **Avionics:** Flight control systems and cockpit instrumentation. * **Military Gear:** Field communication devices and portable electronics. * **Critical Industrial Controls:** PLCs and sensors where a fuse failure must be avoided and protection must be precise.