The **BK/PCB-3-R** is a specific type of subminiature radial-leaded fuse manufactured by **Eaton (formerly Bussmann)**. It is designed for space-constrained printed circuit board (PCB) applications. ### 1. Technical Specifications The following table highlights the core electrical and mechanical characteristics of the BK/PCB-3-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 3 Amperes | | **Voltage Rating (AC)** | 250 VAC | | **Interrupting Rating** | 50A at 250VAC | | **Fuse Speed** | Fast-Acting (F) | | **Mounting Type** | Through-Hole (Radial Leads) | | **Body Material** | Rectangular Plastic (Phenolic) | | **Termination Style** | Solderable Leads | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **BK/**: Packaging prefix (Bulk pack). * **PCB**: Product series (Subminiature Through-hole Fuse). * **3**: Amperage rating (3 Amps). * **-R**: RoHS (Restriction of Hazardous Substances) compliant. --- ### 3. Key Applications and Features The BK/PCB series is widely used in the electronics industry due to its compact form factor and reliable performance. * **Space Saving:** Unlike traditional 5x20mm glass fuses that require bulky clips, this fuse has a small rectangular footprint, saving significant "real estate" on the PCB. * **Direct Soldering:** Designed to be soldered directly onto the board, eliminating the contact resistance issues sometimes associated with fuse holders. * **Fast-Acting Protection:** It is engineered to blow quickly when an overcurrent occurs, protecting sensitive downstream components like ICs, power transistors, and microcontrollers. * **Common Use Cases:** * Power supplies and adapters. * Consumer electronics (TVs, chargers). * Industrial controllers. * Telecommunications equipment. --- ### 4. Mounting Diagram Representation The physical layout is typically a small rectangular box with two leads protruding from the bottom: ```text [ 3A ] <-- Fuse Body [ ] | | <-- Radial Leads (Solder into PCB) ----------- <-- PCB Surface ```