The **5VTP4-R** is a specific type of electronic fuse, belonging to the subminiature, slow-blow (time-delay) category. It is commonly used in power supplies, consumer electronics, and industrial controllers to protect circuits from overcurrent conditions. ### Technical Specifications Below are the primary technical characteristics of the 5VTP4-R: | Feature | Specification | | :--- | :--- | | **Part Number** | 5VTP4-R | | **Current Rating** | 4 Amperes (4A) | | **Voltage Rating (AC)** | 250 Volts | | **Fuse Type** | Time-Delay / Slow-Blow (T) | | **Form Factor** | 5x20mm (Subminiature) | | **Termination Style** | Radial Leaded (Through-hole) | | **Body Material** | Glass or Ceramic (depending on series variation) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### Key Components and Features #### 1. Time-Delay Mechanism (Slow-Blow) Unlike "Fast-Acting" fuses, the 5VTP4-R is designed to withstand temporary surges in current, such as the initial "inrush current" when a motor starts or a power supply is plugged in. It will only blow if the overcurrent persists beyond a specific time threshold. #### 2. Radial Leaded Design The "V" in the part number often signifies a vertical/radial lead configuration. Instead of fitting into a fuse clip, this part is soldered directly onto a Printed Circuit Board (PCB). This saves space and reduces assembly costs in mass production. #### 3. Safety Compliance The 5VTP4-R is typically rated under international standards such as: * **UL/CSA:** North American safety standards. * **IEC 60127:** International standard for miniature fuses. * **RoHS:** Lead-free and environmentally friendly construction. ### Common Applications * **Power Adapters:** Protecting internal circuitry from AC line surges. * **LED Drivers:** Managing high inrush currents during startup. * **Industrial Equipment:** Protecting small motors or control boards. * **Consumer Electronics:** Used in televisions, chargers, and home appliances. --- ### Replacement Considerations When replacing a 5VTP4-R, ensure the following parameters match exactly: 1. **Amperage:** Do not exceed 4A. 2. **Voltage:** Ensure the replacement is rated for at least 250V. 3. **Speed:** You must use a **Slow-Blow (T)** fuse. Using a Fast-Acting (F) fuse will cause it to blow immediately upon startup.