The **2JS1.5-R** is a specific model of a **Miniature Glass Tube Fuse**, typically categorized under the 2JS series. It is widely used in power supplies, consumer electronics, and industrial equipment to provide overcurrent protection. ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Model Number** | 2JS1.5-R | | **Current Rating** | 1.5 Amperes (1.5A) | | **Voltage Rating** | 350V AC (Standard) | | **Fuse Type** | Slow-Blow (Time-Delay) | | **Body Material** | Glass Tube | | **Physical Size** | 5.2mm x 20mm (Standard small form factor) | | **Termination** | Cartridge (Ferrule) or Axial Lead (depending on variant) | | **RoHS Compliant** | Yes (Indicated by the "-R" suffix) | --- ### 2. Key Features and Behavior #### A. Slow-Blow (Time-Delay) Characteristic Unlike "Fast-Acting" fuses, the 2JS1.5-R is designed to withstand temporary current surges (inrush current) that occur when a device is first turned on. It will only blow if the overcurrent persists for a specific duration or if a major short circuit occurs. #### B. The "-R" Suffix The suffix **-R** indicates that the part is **RoHS (Restriction of Hazardous Substances) compliant**, meaning it is manufactured without lead, mercury, or cadmium. #### C. Glass Body Construction The transparent glass body allows for easy visual inspection. If the fuse is blown, the internal wire filament will often look broken or there will be a dark "burn" mark inside the tube. --- ### 3. Common Applications * **Power Adapters:** Protecting internal circuits from spikes. * **LED Drivers:** Managing initial inrush current. * **Consumer Electronics:** Televisions, audio equipment, and small appliances. * **Industrial Controls:** Protecting PLCs and low-voltage control circuits. --- ### 4. Replacement Guide When replacing a **2JS1.5-R**, ensure the replacement matches these three critical factors: 1. **Amperage:** Must be exactly **1.5A**. 2. **Voltage:** Can be equal to or higher than the original (e.g., a 250V fuse can be replaced by a 350V fuse, but not vice versa). 3. **Speed:** Must be **Slow-Blow (T)**. Replacing a slow-blow fuse with a fast-acting fuse will result in the fuse blowing immediately upon device startup.