The **5SF200-R** typically refers to a high-speed, fast-acting subminiature fuse, often part of the 5SF series produced by manufacturers like Bel Fuse. These components are critical for protecting sensitive electronic circuits from overcurrent conditions. --- ### 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of the 5SF200-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 200 mA | | **Voltage Rating (AC)** | 250 V | | **Fuse Type** | Glass Body / Cartridge | | **Response Characteristic** | Fast Acting (F) | | **Size / Dimension** | 5mm x 20mm | | **Interrupting Rating** | 35A @ 250V AC | | **Termination Style** | Cartridge (Ferrule) | | **RoHS Compliant** | Yes (-R suffix indicates RoHS compliance) | --- ### 2. Key Components and Materials The 5SF200-R is constructed using specific materials to ensure rapid disconnection during a fault: * **Fuse Element:** A thin wire or filament designed to melt at exactly 200mA of sustained current. * **Body:** High-quality glass tube which allows for visual inspection of the filament. * **End Caps:** Nickel-plated brass or copper caps that provide high conductivity and corrosion resistance. * **Arc Quenching:** In some high-voltage variations, the interior may contain air or a vacuum to prevent arc jumping once the element breaks. --- ### 3. Application and Usage Because this is a **Fast-Acting** fuse with a low amperage rating (200mA), it is used in precision electronics where even a small surge could destroy delicate components. #### Common Use Cases: 1. **Power Supplies:** Protecting the primary or secondary side of small transformers. 2. **Instrumentation:** Used in multimeters and medical monitoring equipment. 3. **Consumer Electronics:** Protecting PCB traces in audio/video equipment. 4. **Industrial Controls:** Protecting PLC (Programmable Logic Controller) input/output modules. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting replacements: | Prefix | Value | Suffix | Meaning | | :--- | :--- | :--- | :--- | | **5SF** | **200** | **-R** | 5x20mm Fast-acting, 200 Milliamp, RoHS compliant. | ---