## GMA-1.5-R: Technical Overview The **GMA-1.5-R** is a specific model of a **fast-acting glass tube fuse** manufactured by Eaton (formerly Bussmann). It is widely used in electronic circuits to provide overcurrent protection for sensitive components. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Current Rating** | 1.5 Amps | | **Voltage Rating** | 250 VAC (Volts Alternating Current) | | **Fuse Type** | Fast-Acting / Fast Blow (F) | | **Material** | Glass Tube with Nickel-plated Brass Endcaps | | **Dimensions** | 5mm x 20mm (Standard Small Dimension) | | **Interrupt Rating** | 35A @ 250VAC / 10kA @ 125VAC | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Physical Construction The fuse consists of three primary electronic/mechanical parts: 1. **The Element:** A thin metallic wire designed to melt when the current exceeds 1.5A for a specific duration. 2. **The Body:** A transparent glass cylinder that allows for visual inspection (you can see if the fuse is "blown"). 3. **End Caps:** Conductive metal caps that provide the electrical interface with a fuse holder or clips. --- ### 3. Application and Performance The "Fast-Acting" nature of the GMA-1.5-R means it is designed to open (break the circuit) very quickly—usually within milliseconds—when an overload occurs. * **Best For:** Protecting sensitive instruments, power supplies, and control circuits where a sudden surge could damage downstream components. * **Not Recommended For:** Circuits with high "in-rush" currents (like large motors or transformers), as the fuse may blow prematurely. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar components: * **GMA:** The series name (Standard 5x20mm glass fuse). * **1.5:** The amperage rating (1.5 Amps). * **-R:** Indicates RoHS compliance (Lead-free). ---