The **5ST100-R** is a specific type of **Cartridge Fuse** manufactured by Bel Fuse Inc. It belongs to the 5ST series, which is characterized by its time-lag (slow-blow) mechanism and high breaking capacity. --- ### ## Technical Specifications The following table outlines the primary electrical and physical characteristics of the 5ST100-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 100 mA | | **Voltage Rating (AC)** | 250 V | | **Fuse Type** | Glass Body / Cartridge | | **Characteristic** | Time-Lag (Slow Blow) | | **Size / Dimension** | 5mm x 20mm | | **Interrupting Rating** | 35A @ 250V AC | | **Mounting Type** | Holder / Clip | | **Material** | Glass Body, Nickel Plated Brass Caps | --- ### ## Key Features & Construction 1. **Time-Lag (T) Design:** The "Slow-Blow" nature allows the fuse to withstand temporary current surges (inrush current) without blowing, but it will open if a sustained overload occurs. 2. **Standard Size:** The 5x20mm form factor is one of the most common worldwide, making it easily replaceable in consumer electronics. 3. **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and complies with RoHS (Restriction of Hazardous Substances) directives. 4. **Low Current Sensitivity:** At 100mA, it is designed to protect delicate low-power circuits, such as power supplies for sensors or small control boards. --- ### ## Common Applications * **Power Supplies:** Protecting the primary side of small AC/DC adapters. * **Consumer Electronics:** Televisions, audio equipment, and chargers. * **Industrial Equipment:** Control panels and PLCs where small inductive loads might cause a momentary spike. * **Medical Devices:** Sensitive diagnostic equipment requiring precise overcurrent protection. --- ### ## Breakdown of Part Number * **5ST**: Series Name (Time-Lag, 5x20mm). * **100**: Current Rating (100 milliamperes). * **-R**: RoHS Compliant version.