The **GMA-1.6-R** is a specific type of electronic component, specifically a **fast-acting glass tube fuse**. It is widely used in power supplies, consumer electronics, and industrial equipment to protect circuits from overcurrent conditions. --- ### 1. Technical Specifications Below is a breakdown of the electrical and physical characteristics of the GMA-1.6-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 1.6 Amperes | | **Voltage Rating** | 250 Volts AC (Commonly) | | **Fuse Speed** | Fast-Acting (F) / Quick Acting | | **Body Material** | Glass Tube | | **Dimensions** | 5mm x 20mm (Standard Small Dimension) | | **Termination Style** | Cartridge (Ferrule) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying the part's capabilities: * **GMA**: This series prefix indicates the physical size (5x20mm) and the "Fast-Acting" characteristic. * **1.6**: The rated current in Amperes. The fuse will allow up to 1.6A to pass continuously; anything significantly higher will cause the internal filament to melt. * **-R**: Indicates that the part is **RoHS Compliant** (Lead-free and restricted hazardous substances). --- ### 3. Key Electronic Functions The GMA-1.6-R serves several critical roles within a circuit: 1. **Overcurrent Protection:** Its primary job is to act as a "weak link." If a component fails and draws too much current, the fuse blows to prevent further damage. 2. **Fast-Acting Response:** Unlike "Slo-Blo" (Time-delay) fuses, the GMA-1.6-R is designed to open almost instantly when an overload occurs. This is vital for protecting sensitive semiconductor components (like ICs or transistors) that cannot withstand even brief surges. 3. **Visual Inspection:** Because it is housed in a glass tube, a technician can often see if the internal wire is broken or if there is charring, allowing for quick troubleshooting. --- ### 4. Common Applications * **Power Supplies:** Protecting the input stage of AC/DC adapters. * **Test Equipment:** Multimeters and oscilloscopes often use 5x20mm fuses. * **Consumer Electronics:** Found in older audio amplifiers, microwave ovens, and desktop computer power units.