The **5ST315-R** is a specific type of electronic component used primarily in power management and circuit protection. It belongs to the **fuse** category, specifically categorized as a subminiature, leaded, time-delay fuse. --- ## 1. Technical Specifications The following table outlines the core electrical characteristics of the 5ST315-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 315 mA (0.315A) | | **Voltage Rating (AC)** | 250 V | | **Fuse Type** | Glass Body / Cartridge (5x20mm) | | **Response Characteristic** | Time-Delay (Slow Blow / Slo-Blo) | | **Interrupting Rating** | 35A @ 250V AC | | **Termination Style** | Axial Leaded (R suffix usually denotes Pigtail/Leads) | --- ## 2. Key Features and Construction The "5ST" series is designed to meet specific international safety standards. ### Mechanical Design * **Body Material:** High-quality glass tube, which allows for visual inspection of the fuse element. * **Leads:** The "R" in the part number typically signifies **Radial** or **Axial leads** (pigtails) welded to the end caps, allowing the fuse to be soldered directly onto a Printed Circuit Board (PCB) rather than using a fuse holder. * **Dimensions:** Standard 5mm diameter by 20mm length. ### Electrical Behavior * **Time-Delay (T):** Unlike "Fast-Acting" fuses, the 5ST315-R is designed to withstand temporary current surges (inrush current) without blowing. This is crucial for devices with inductive loads like motors or transformers. * **Low Breaking Capacity:** Designed for applications where the potential short-circuit current is relatively low. --- ## 3. Typical Applications Because of its slow-blow nature and low current rating, this component is commonly found in: * **Power Supplies:** Protecting the primary side of small AC/DC adapters. * **Consumer Electronics:** Televisions, chargers, and audio equipment. * **Industrial Controls:** Protecting sensitive control circuits that experience brief power spikes during startup. --- ## 4. Compliance and Safety The 5ST315-R is usually manufactured to comply with: * **IEC 60127-2:** International standard for miniature fuses. * **RoHS Compliant:** Lead-free and environmentally friendly. * **Safety Agency Approvals:** Often carries VDE, SEMKO, and cURus marks.