## Understanding the 5ET2-R Fuse The **5ET2-R** is a specific model of electronic fuse manufactured primarily by **Bel Fuse Inc.** It belongs to the 5ET series, which consists of time-delay (slow-blow), high-breaking capacity glass tube fuses. ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the 5ET2-R: | Feature | Specification | | :--- | :--- | | **Current Rating** | 2 Amperes (2A) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Material** | Glass Body / Nickel Plated Brass Caps | | **Form Factor** | 5mm x 20mm | | **Interrupting Rating** | 1500A @ 250V AC | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Breakdown of the Part Number The nomenclature provides specific information about the component's build: * **5ET**: Represents the series name. In the Bel Fuse catalog, "5ET" refers to 5x20mm time-delay fuses with a high breaking capacity. * **2**: Indicates the rated current in Amperes (2A). * **-R**: Signifies that the part is **RoHS compliant** (lead-free and environmentally friendly). --- ### 3. Functional Characteristics Electronic parts like the 5ET2-R are designed with specific behaviors to protect circuits: #### A. Time-Delay (Slow-Blow) Unlike "fast-acting" fuses, the 5ET2-R is designed to withstand temporary surges in current (inrush current). This is crucial for devices like motors or power supplies that draw a large amount of power for a fraction of a second when turned on. #### B. High Breaking Capacity The "high breaking capacity" means this fuse can safely interrupt a high fault current (up to 1500A) without the glass tube shattering or exploding, providing a high level of safety for industrial and consumer electronics. --- ### 4. Common Applications Due to its 5x20mm size and 250V rating, the 5ET2-R is commonly found in: * **Power Supplies:** Protecting the input stage from overcurrent. * **Industrial Controls:** Safeguarding PLC outputs. * **Consumer Electronics:** Used in high-end audio equipment, chargers, and small appliances. * **Monitors/Displays:** Protecting internal circuitry from line surges. ---