The **5SFP 250-R** is a specific type of electronic component categorized as a **Time-Delay Glass Body Cartridge Fuse**. It is manufactured by **Bel Fuse Inc.** and is widely used for circuit protection in various electronic devices. --- ## 1. Technical Specifications The following table outlines the primary electrical and physical characteristics of the 5SFP 250-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 250mA (0.25A) | | **Voltage Rating (AC)** | 250V | | **Fuse Type** | Glass Body Cartridge | | **Response Time** | Slow Blow / Time Delay (SFP Series) | | **Size / Dimension** | 5mm x 20mm | | **Termination Style** | Pigtail Leads (Axial Leaded) | | **Breaking Capacity** | 35A @ 250V AC | | **RoHS Status** | Compliant (Lead-Free) | --- ## 2. Key Features and Components ### A. Slow-Blow Mechanism (Time-Delay) The "SFP" designation indicates a **Slow-Blow** characteristic. Unlike "Fast-Acting" fuses, this part is designed to tolerate temporary surges in current (inrush current) without blowing. This is essential for circuits containing capacitors or motors that draw a high initial current when powered on. ### B. Pigtail Leads (The "-R" Suffix) The "-R" in the part number signifies that this fuse comes with **axial pigtail leads**. - **Application:** These are meant to be soldered directly onto a Printed Circuit Board (PCB) rather than being placed in a traditional fuse clip or holder. ### C. Glass Body Construction The transparent glass body allows for easy visual inspection. If the internal wire is melted or the glass is blackened, the user can immediately identify that the fuse has blown. --- ## 3. Common Applications Due to its 250mA rating and slow-blow nature, the 5SFP 250-R is typically found in: * **Power Supplies:** Protecting input stages from sustained overcurrent. * **Consumer Electronics:** Televisions, chargers, and audio equipment. * **Industrial Controllers:** Small-scale automation hardware where space is limited. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **5SFP**: Series name (5x20mm, Time-Lag, Glass). * **250**: The current rating (250 Milliamps). * **-R**: Indicates the RoHS compliance and/or the presence of axial leads (depending on specific manufacturer catalog updates).