The **GSA 1.25-R** is a specific type of **Subminiature Axial Lead Fuse** manufactured by Bel Fuse Inc. These components are designed for primary circuit protection in compact electronic devices. --- ### 1. Technical Specifications The "GSA 1.25-R" designation contains specific information about its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 1.25 Amperes | | **Voltage Rating** | 250V AC | | **Fuse Type** | Slow Blow (Time Delay) | | **Mounting Style** | Axial Lead (Through-hole) | | **Body Material** | Ceramic or Glass (usually ceramic for GSA series) | | **Compliance** | RoHS 6 Compliant (indicated by the "-R" suffix) | --- ### 2. Key Features * **Slow Blow Characteristic:** Unlike fast-acting fuses, the GSA 1.25-R is designed to withstand temporary current surges (inrush current) without blowing. This is essential for circuits with inductive loads like small motors or power transformers. * **Form Factor:** The axial lead design allows the fuse to be soldered directly onto a Printed Circuit Board (PCB) like a resistor, eliminating the need for a separate fuse holder. * **Interrupting Rating:** It typically has a high interrupting capacity (e.g., 100A at 250V AC), meaning it can safely break a circuit under significant fault conditions without exploding. --- ### 3. Common Applications Due to its 1.25A rating and slow-blow nature, it is frequently found in: 1. **Power Supplies:** Protecting the input stage from sustained overcurrent. 2. **Chargers:** Small adapters for laptops or handheld electronics. 3. **Industrial Controls:** Protecting internal PCB traces from component failure. 4. **Monitors and Displays:** Handling the startup surge of power components. --- ### 4. Part Number Breakdown ```text GSA 1.25 - R | | | Series Amps RoHS Compliant ```