The **5TTP 100-R** is a specific type of electronic protection component, primarily categorized as a **Time-Lag (Slo-Blo) axial leaded fuse**. It is part of the 5TTP series manufactured by Bel Fuse Inc. --- ## 1. Technical Specifications The following table outlines the key electrical and physical characteristics of the 5TTP 100-R: | Feature | Specification | | :--- | :--- | | **Component Type** | Glass Body Fuse (Axial Leaded) | | **Current Rating** | 100 mA (0.1A) | | **Voltage Rating (AC)** | 250 V | | **Characteristic** | Time-Lag / Slow Blow (T) | | **Interrupting Rating** | 35A @ 250V AC / 10kA @ 125V AC | | **Dimensions** | 5mm x 20mm | | **Mounting Type** | Through-Hole (Axial Leads) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ## 2. Key Components and Design The 5TTP 100-R is engineered for specific durability standards: ### Axial Leads Unlike standard cartridge fuses that snap into a clip, the "P" in 5TTP stands for **Pigtail**. These are wire leads soldered to the end caps, allowing the fuse to be soldered directly onto a Printed Circuit Board (PCB). ### Slow-Blow Mechanism This fuse is designed with a specific thermal mass that allows it to withstand temporary **inrush currents** (surges) without blowing. It will only open the circuit if the overload persists, protecting sensitive electronics from sustained over-current while preventing "nuisance" blowing during startup. ### Construction Materials * **Body:** Glass tube for easy visual inspection of the filament. * **Caps:** Nickel-plated brass for high conductivity and corrosion resistance. * **Filament:** Specially coiled or weighted wire to achieve the time-delay characteristic. --- ## 3. Common Applications Due to its low current rating (100mA) and slow-blow nature, it is typically found in: 1. **Power Supplies:** Protecting the primary side of small transformers. 2. **Industrial Controls:** Safeguarding low-power logic circuits. 3. **Consumer Electronics:** Used in devices where inductive loads (like small motors or fans) cause initial current spikes. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **5TT:** Series designation (5x20mm Time-lag). * **P:** Pigtail/Axial leads (standard 5TT has no leads). * **100:** Current rating (100 milliamps). * **-R:** RoHS compliant (Lead-free).