The **5HT 630-R** is a specific type of **miniature cartridge fuse** commonly used in consumer electronics, power supplies, and industrial equipment. It belongs to the "5HT" series, which is characterized by its high-breaking capacity and time-lag (slow-blow) characteristics. --- ### Technical Specifications Below are the primary electronic characteristics of the 5HT 630-R: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 630 mA (0.63 Amps) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Time-Lag (Slow Blow / "T") | | **Breaking Capacity** | 1500A @ 250V AC | | **Body Material** | Ceramic | | **Dimensions** | 5mm x 20mm | | **Termination Style** | Cartridge (Ferrule) | --- ### Key Component Details #### 1. Time-Lag Characteristic ("T") The "T" in the rating indicates this is a **Slow-Blow** fuse. Unlike fast-acting fuses, the 5HT 630-R is designed to tolerate a temporary surge of current (inrush current) without blowing. This is essential for circuits with inductive loads (like small motors or transformers) that draw more power momentarily when turned on. #### 2. Ceramic Construction Unlike glass fuses, the 5HT series uses a **Ceramic tube**. * **High Breaking Capacity:** The ceramic body allows the fuse to safely interrupt much higher currents (up to 1500A) without the casing shattering. * **Arc Quenching:** The interior is often filled with silica sand to extinguish the electrical arc formed when the fuse wire melts. #### 3. Marking Convention On the metal end caps, you will typically find stamps indicating: * **T**: Time-lag. * **H**: High breaking capacity. * **630mA**: The rated current. * **250V**: The maximum voltage. --- ### Common Applications * **Switch Mode Power Supplies (SMPS):** Protecting the input stage from overcurrent. * **LED Drivers:** Handling the initial surge when LEDs are powered. * **Industrial Controllers:** Used on PCBs where space is limited but high protection is required. * **Audio/Video Equipment:** Protecting internal transformers. --- ### Replacement Safety Note When replacing a **5HT 630-R**, ensure the replacement is also **Ceramic** and **Time-Lag**. Replacing it with a glass fuse or a fast-acting fuse (marked "F") may result in the fuse blowing prematurely or failing to safely contain an electrical fault.