### Technical Overview: MJS350-R (Fuse) The **MJS350-R** is a specific model of a subminiature, leaded fuse manufactured by **Bel Fuse Inc.** It belongs to the MJS series, which is characterized by its high-breaking capacity and time-lag (slow-blow) characteristics. --- ### 1. Key Electronic Specifications The "350" in the part number indicates the current rating, and the "-R" suffix typically denotes RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Current Rating** | 350 mA (0.35A) | | **Voltage Rating (AC)** | 250V | | **Fuse Type** | Time-Lag / Slow-Blow | | **Breaking Capacity** | 200A @ 250V AC | | **Mounting Type** | Through-Hole (Axial Leaded) | | **Body Material** | Glass Tube with Nickel-Plated Brass Caps | | **Operating Temp** | -55°C to +125°C | --- ### 2. Physical Design and Dimensions The MJS series is known for its compact "micro" footprint compared to standard 5x20mm fuses. * **Form Factor:** Subminiature (approx. 4.7mm x 15mm cylinder). * **Terminals:** Axial leads (pigtails) designed for direct soldering onto a Printed Circuit Board (PCB). * **Material:** The transparent glass body allows for visual inspection to confirm if the fuse has blown. --- ### 3. Functional Characteristics #### Time-Lag (Slow-Blow) The MJS350-R is designed to withstand temporary current surges (inrush current) that occur when a device is first powered on. It will not blow immediately if the current slightly exceeds 350mA for a fraction of a second, but it will open the circuit if the overload persists. #### Application Usage These fuses are commonly found in: 1. **Power Supplies:** Protecting input stages from sustained overcurrent. 2. **Consumer Electronics:** Chargers, monitors, and small appliances. 3. **Industrial Equipment:** Control boards where space is limited. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **MJS** | Series Name (Subminiature Time-Lag Glass Fuse) | | **350** | Amperage Rating (350 Milliamps) | | **-R** | RoHS Compliant (Lead-Free) | ---