The **GSAP-125-R** is a specific model of subminiature, fast-acting fuse produced by **Bel Fuse Inc.** It belongs to the GSAP series, which is characterized by its axial-leaded ceramic body design. Below is a detailed breakdown of its electronic specifications and characteristics. --- ### 1. Technical Specifications The part number "125" indicates the current rating, while "R" typically signifies RoHS compliance. | Feature | Specification | | :--- | :--- | | **Current Rating** | 125mA (0.125 Amps) | | **Voltage Rating (AC)** | 250V | | **Voltage Rating (DC)** | 125V | | **Fuse Type** | Fast-Acting (Quick Acting) | | **Body Material** | Ceramic | | **Termination Style** | Axial Leaded (Through-hole) | | **Interrupting Rating** | 100A @ 250V AC | | **Resistance (Cold)** | ~2.5 to 3.5 Ohms (Typical) | --- ### 2. Key Features * **Form Factor:** It uses a small, cylindrical ceramic body with pigtail leads, making it suitable for soldering directly onto Printed Circuit Boards (PCBs). * **Fast-Acting:** Designed to open quickly when an overcurrent condition occurs. This is critical for protecting sensitive semiconductor components. * **High Interrupting Capacity:** Despite its small size, the ceramic body allows it to safely interrupt higher fault currents compared to standard glass fuses. * **RoHS Compliant:** The "R" suffix confirms that the part meets environmental standards regarding hazardous substances (Lead-free). --- ### 3. Common Applications Due to its low current rating (125mA) and high voltage tolerance, the GSAP-125-R is commonly used in: 1. **Power Supplies:** Protecting the primary side of small AC/DC adapters. 2. **Industrial Instrumentation:** Protecting sensitive measurement circuits. 3. **Consumer Electronics:** Used in chargers, LED drivers, and household appliances. 4. **Telecommunications:** Protection for networking hardware and line cards. --- ### 4. Comparison: GSAP vs. GSA It is important to distinguish between the series: * **GSA Series:** Standard 5x20mm glass or ceramic cartridge fuses (usually requires a fuse holder). * **GSAP Series:** Specifically refers to the **Axial Leaded** version (Pigtail) intended for direct PCB mounting. ---