The **5HT630-R** is a specific type of electronic component—a **High-Voltage, Time-Lag (Slow-Blow) Radial Lead Fuse**. It is commonly used in power supplies, chargers, and consumer electronics to protect circuits from overcurrent conditions. --- ### 1. Key Technical Specifications The part number "5HT630-R" typically breaks down into its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 630mA (Milliampere) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Lag / Slow-Blow (T) | | **Form Factor** | Radial Lead (Round/Subminiature) | | **Termination** | Through-Hole (PCB Mount) | | **Compliance** | RoHS Compliant (-R suffix) | --- ### 2. Physical Characteristics Unlike traditional glass tube fuses, the 5HT series is designed for permanent installation on a Printed Circuit Board (PCB). * **Body Material:** High-temperature thermoplastic or ceramic. * **Dimensions:** Usually a small cylindrical body (approx. 8.5mm diameter). * **Leads:** Two tin-plated copper wires extending from the bottom for through-hole soldering. --- ### 3. How it Works (Time-Lag Feature) The "Time-Lag" (or Slow-Blow) characteristic is critical for this component: * **Transient Tolerance:** It allows a temporary surge of current (inrush current) that occurs when a device is first turned on. * **Protection:** If the high current persists beyond a few milliseconds (indicating a short circuit or component failure), the internal element melts and opens the circuit. * **Application:** Ideal for circuits with capacitors or motors that "spike" upon startup. --- ### 4. Typical Applications * **LED Lighting:** Protecting driver circuits. * **Power Adapters:** Used on the primary AC side of laptop bricks or phone chargers. * **Home Appliances:** Control boards for small electronics. * **Battery Chargers:** Preventing fire hazards during internal component shorts. --- ### 5. Identification and Safety When replacing this part, look for the following markings on the body: ```text T 630mA 250V (T stands for Time-Lag) ``` **Safety Note:** Never replace a "T" (Slow-Blow) fuse with an "F" (Fast-Acting) fuse of the same rating, as the fast-acting fuse will likely blow immediately upon device startup.