The **3AG 2.5-R** is a specific type of electronic component, most commonly categorized as a **cartridge fuse**. Below is a detailed technical breakdown of this part. ### 1. Component Overview The designation "3AG" refers to a standardized physical size, while "2.5-R" indicates its electrical rating and compliance. It is primarily used to protect electronic circuits from overcurrent conditions. --- ### 2. Technical Specifications | Feature | Specification | | :--- | :--- | | **Part Type** | Glass Body Cartridge Fuse | | **Size Code** | 3AG (Industry Standard) | | **Current Rating** | 2.5 Amperes (2.5A) | | **Voltage Rating** | Typically 250V AC | | **Dimensions** | 6.3mm x 32mm (1/4" x 1-1/4") | | **Response Characteristic** | Usually Fast-Acting (F) or Normal Blo | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 3. Key Characteristics * **3AG Designation:** This is the American standard size for fuses. It is one of the most common sizes found in older consumer electronics, power supplies, and automotive test equipment. * **Material:** The body is made of **glass**, which allows for visual inspection. If the fuse has blown, the internal wire filament will be visibly broken or the glass will be charred. * **The "-R" Suffix:** In the electronics industry (specifically for brands like Littelfuse or Bel Fuse), the "R" stands for **RoHS Compliant**. This means the part is manufactured without lead or other hazardous substances. * **Termination:** These are typically ferrule-type fuses designed to be placed in a fuse clip or a panel-mount fuse holder. --- ### 4. Applications and Use Cases The 3AG 2.5-R is used in a variety of environments to prevent fire or circuit damage: 1. **Power Supplies:** Protecting the input stage from current spikes. 2. **Amplifiers:** Safeguarding audio equipment from internal shorts. 3. **Industrial Controls:** Used in control panels for low-current machinery. 4. **Appliances:** Common in older microwave ovens and kitchen electronics. --- ### 5. Identification Code Example When reading the end caps of the fuse, you might see: ```text F 2.5A 250V ``` * **F:** Fast-acting (blows quickly when the limit is exceeded). * **2.5A:** The maximum continuous current it can handle. * **250V:** The maximum voltage rating the fuse can safely interrupt.