The **3SBP 250-R** is a specific type of electronic component, specifically a **subminiature axial leaded fuse** part of the 3SBP series manufactured by Bel Fuse Inc. These fuses are known for their "Time-Delay" (slow-blow) characteristics and ceramic tube construction. --- ## Technical Specifications The table below outlines the primary electronic characteristics of the 3SBP 250-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 250 mA (0.25 Amps) | | **Voltage Rating (AC)** | 250 V | | **Fuse Type** | Time-Delay (Slow-Blow) | | **Body Material** | Ceramic Tube | | **Mounting Type** | Through Hole (Axial Leads) | | **Interrupting Rating** | 100A @ 250V AC | | **Dimensions** | 3.6mm x 10mm (Subminiature) | | **RoHS Status** | Compliant (indicated by the "-R" suffix) | --- ## Key Features ### 1. Slow-Blow (Time-Delay) Characteristic The "Time-Delay" nature of this fuse allows it to withstand temporary surges or "inrush currents" that occur when a device is first turned on. Unlike a fast-acting fuse, it will not blow immediately unless the overcurrent persists or is extremely high. ### 2. Physical Construction * **Ceramic Body:** Provides higher breaking capacity and thermal stability compared to glass fuses. * **Axial Leads:** The wire leads are attached to the end caps, allowing the fuse to be soldered directly onto a Printed Circuit Board (PCB). ### 3. Safety Standards The 3SBP 250-R is typically certified by international safety agencies such as: * **UL (Underwriters Laboratories)** * **CSA (Canadian Standards Association)** * **PSE (Japan)** --- ## Typical Applications Because of its small form factor and slow-blow characteristic, it is commonly used in: * **Power Supplies:** Protecting against sustained overcurrent while ignoring initial capacitor charging spikes. * **Consumer Electronics:** Chargers, adapters, and small appliances. * **Industrial Equipment:** Control boards where space is limited. --- ## Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **3SBP:** Series identifier (3.6x10mm Ceramic, Time-Delay). * **250:** The current rating (250mA). * **-R:** Indicates RoHS compliance (Lead-free).