The **5TTP 400-R** is a specific type of electronic component categorized as a **Time-Lag (Slo-Blo) Glass Tube Fuse**. It is manufactured by **Bel Fuse Inc.** and is widely used for overcurrent protection in various electronic circuits. --- ### 1. Technical Specifications The following table highlights the core electrical and physical characteristics of the 5TTP 400-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 400mA (0.4A) | | **Voltage Rating (AC)** | 250V | | **Fuse Type** | Time-Lag / Slow Blow (T) | | **Body Material** | Glass | | **Dimensions** | 5mm x 20mm | | **Termination Style** | Cartridge / Axial Lead options | | **Interrupting Rating** | 100A @ 250V AC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Key Features and Components * **Time-Lag Characteristic:** The "T" in 5TTP stands for "Time-lag." Unlike fast-acting fuses, this part is designed to withstand temporary surges in current (inrush current) without blowing, but it will open the circuit if an overload persists. * **The "-R" Suffix:** This indicates that the part is fully compliant with **RoHS** (Restriction of Hazardous Substances) standards, meaning it is lead-free. * **Construction:** It consists of a glass body (allowing for visual inspection of the filament) and nickel-plated brass end caps. * **Standard Size:** The 5x20mm form factor is a global standard, making it easy to find compatible fuse holders or clips. --- ### 3. Common Applications The 5TTP 400-R is typically found in devices where inductive loads or large capacitors cause a momentary spike in current when the device is turned on. * **Power Supplies:** Protecting the primary side of AC/DC converters. * **Consumer Electronics:** Used in televisions, audio equipment, and chargers. * **Industrial Equipment:** Small control panels and instrumentation. * **LED Lighting:** Drivers that experience high inrush currents upon startup. --- ### 4. Safety Standards The 5TTP series is designed to meet several international safety requirements to ensure reliability: * **UL/CSA Listed:** Certified for safety standards in North America. * **IEC 60127:** Complies with international standards for miniature fuses. * **CE Marking:** Meets European safety, health, and environmental protection requirements.