The **5TTP 200-R** is a specific type of electronic component categorized as a **Time-Lag (Slow Blow) Glass Body Fuse**. It is part of the 5TTP series manufactured by **Bel Fuse Inc.** Below is a detailed breakdown of its specifications, construction, and applications. --- ## 1. Technical Specifications These values define the electrical limits and physical dimensions of the fuse. | Parameter | Specification | | :--- | :--- | | **Current Rating** | 200 mA (0.2A) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Lag / Slow Blow (T) | | **Body Material** | Glass | | **Size / Dimension** | 5mm x 20mm (Standard small cartridge) | | **Mounting Type** | Holder / Clip (Pigtail Lead version available) | | **Breaking Capacity** | 35A @ 250V AC | | **Resistance (Cold)** | ~3.3 Ohms | --- ## 2. Key Characteristics ### A. Time-Lag (Slow Blow) Functionality The "T" in the part number indicates it is a **Time-Delayed** fuse. Unlike fast-acting fuses, the 5TTP 200-R is designed to withstand temporary current surges (inrush current). This is crucial for devices like motors or transformers that pull more power for a fraction of a second when first turned on. ### B. Axial Lead Design (The "P" in 5TTP) The "P" typically signifies **Pigtail Leads**. This means the fuse has wire leads soldered to the end caps, allowing it to be soldered directly onto a Printed Circuit Board (PCB) without a fuse holder. ### C. Compliance * **RoHS 6 Compliant:** The "-R" suffix at the end of the part number denotes that the component is Lead-Free and meets RoHS environmental standards. * **Agency Approvals:** Usually certified by UL (Underwriters Laboratories) and CSA. --- ## 3. Physical Construction * **Encapsulation:** A transparent glass tube that allows for easy visual inspection to see if the internal filament has melted (blown). * **End Caps:** Nickel-plated brass caps for high conductivity and corrosion resistance. * **Filament:** A coiled or weighted wire designed to melt slowly under sustained overcurrent. --- ## 4. Common Applications Because of its 200mA rating and slow-blow nature, this fuse is commonly found in: 1. **Power Supplies:** Protecting the primary side of small AC/DC adapters. 2. **Consumer Electronics:** Televisions, audio equipment, and chargers. 3. **Industrial Controls:** Small controllers where initial startup current is higher than the steady-state operating current. ---