The **5ET12-R** is a specific model of a subminiature, slow-blow (time-lag) cartridge fuse. It is commonly used in power supplies, consumer electronics, and industrial chargers to protect circuits from overcurrent conditions. --- ### ## Technical Specifications Below are the primary electronic characteristics of the 5ET12-R fuse: | Feature | Specification | | :--- | :--- | | **Current Rating** | 12 Amperes (12A) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Lag (Slow Blow) / "T" Characteristic | | **Physical Size** | 5mm x 20mm | | **Breaking Capacity** | 120A @ 250V AC | | **Material** | Glass tube with nickel-plated brass end caps | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### ### Key Electronic Functions 1. **Slow-Blow Characteristic**: Unlike "Fast-Acting" fuses, the 5ET12-R is designed to withstand temporary surges or "inrush currents." This is crucial for devices with inductive loads (like motors or large transformers) that draw a high amount of power for a fraction of a second when turned on. 2. **Safety Mechanism**: The internal element is engineered to melt when the current exceeds 12A for a sustained period. This breaks the circuit, preventing fire or damage to more expensive components downstream. 3. **The "-R" Suffix**: In electronic part numbering, the **-R** typically denotes **RoHS Compliance**, meaning the part is manufactured without lead, mercury, cadmium, or other hazardous substances. --- ### ### Common Applications * **Power Adapters**: Protecting the input AC stage. * **LED Drivers**: Managing startup current spikes. * **Home Appliances**: Used in coffee makers, microwave ovens, or monitors. * **Industrial Equipment**: Protecting control boards and small motors. --- ### ### Safety Note When replacing a 5ET12-R, always ensure the replacement matches the **12A rating** and the **Time-Lag (T)** characteristic. Replacing a slow-blow fuse with a fast-acting fuse will likely result in the fuse blowing immediately upon device startup.