## Technical Overview: 3JS30-R Electronic Part The **3JS30-R** is a specific type of **3.6x10mm miniature glass tube fuse**. It belongs to a category of electronic components designed for overcurrent protection in compact electronic circuits. The "R" suffix typically denotes RoHS (Restriction of Hazardous Substances) compliance. --- ### 1. Key Technical Specifications Below is a breakdown of the primary electronic characteristics for the 3JS30-R: | Feature | Specification | | :--- | :--- | | **Component Type** | Cartridge Fuse (Miniature) | | **Material** | Glass Body / Nickel-plated Brass Caps | | **Rated Current** | 30 Amperes (30A) | | **Voltage Rating** | 350V AC / 140V DC (Typical) | | **Fuse Speed** | Slow-Blow / Time-Delay (Type 3JS) | | **Dimensions** | 3.6mm x 10mm | | **Mounting Type** | Axial Lead or Clip-in | --- ### 2. Operational Characteristics #### A. Time-Delay (Slow-Blow) Function Unlike "Fast-Acting" fuses that blow immediately upon reaching the threshold, the **3JS30-R** is designed to withstand short-duration surges. This is critical for circuits that experience high "inrush current," such as: * Starting up a motor. * Charging large capacitors in power supplies. * Transformer excitation. #### B. Breaking Capacity (Interrupting Rating) This part is rated to safely interrupt a specific maximum current without physically exploding or shattering the glass casing. For the 3JS series, this is typically rated at **100A at 350V AC**. --- ### 3. Physical Construction The electronic parts of this fuse include: 1. **Fusible Element:** A specially formulated wire or filament that melts when the current exceeds 30A for a set duration. 2. **Glass Tube:** Provides transparent insulation, allowing for visual inspection of a blown fuse. 3. **End Caps:** Conductive terminals that connect the fuse element to the circuit. --- ### 4. Common Applications Due to its high amperage rating (30A) and small form factor (3.6x10mm), the 3JS30-R is commonly found in: * Compact AC/DC adapters. * Consumer electronics (LED TVs, Monitors). * Battery chargers. * Industrial control boards where space is limited. ---