The **HKP-HH-R** is a high-profile, panel-mount fuse holder manufactured by **Eaton (formerly Bussmann)**. It is specifically designed for 1/4" x 1-1/4" (6.3 x 32mm) fuses, which are standard in many industrial and consumer electronic applications. ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Part Number** | HKP-HH-R | | **Fuse Size** | 1/4" x 1-1/4" (6.3mm x 32mm) | | **Current Rating** | 30 Amperes | | **Voltage Rating** | 250 Volts AC | | **Termination Type** | 1/4" Quick Connect (Male) | | **Mounting Type** | Panel Mount (Nut Secured) | | **Material** | Thermoplastic body, Tin-plated Brass terminals | --- ### 2. Physical Design & Construction * **The "HH" Designation:** In the Bussmann nomenclature, the "HH" indicates that the terminals are **Quick-Connect** (0.250 inch) tabs. This allows for fast installation without soldering. * **The "R" Suffix:** This indicates that the part is **RoHS Compliant**, meaning it meets environmental standards regarding hazardous substances (like lead). * **Bayonet-type Knob:** The fuse is held in a spring-loaded cap. You press and turn the cap to lock/unlock the fuse, which allows for tool-free fuse replacement from the front of the equipment panel. * **High Profile:** The cap protrudes significantly from the panel, making it easy to grip by hand. ### 3. Electronic Functionality The HKP-HH-R serves two primary electronic purposes: 1. **Circuit Protection Housing:** It provides a secure electrical connection between the power source and the load while housing a fuse that will blow if current exceeds the rated limit. 2. **User Safety:** The thermoplastic body acts as an insulator, ensuring that the user is not exposed to live voltages while replacing the fuse or operating the equipment. ### 4. Common Applications * Industrial control panels. * Test and measurement equipment. * Power supplies and battery chargers. * Medical devices (due to the vibration resistance of the bayonet cap). --- ### 5. Mounting Dimensions To install this part, a standard "D" shaped hole or a round hole with a diameter of approximately **0.50 inches (12.7mm)** is required to prevent the body from rotating during installation.