The **R3-NM4-R** is a specific electronic component typically identified as a **panel-mount fuse holder**, often associated with brands like **Littelfuse** or **Schurter**. It is designed to house and protect fuses within a circuit, allowing for easy replacement from the exterior of a device. Below is a breakdown of its technical specifications and features. --- ### 1. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Fuse Holder | | **Fuse Size Accommodated** | 5mm x 20mm (standard glass or ceramic) | | **Current Rating** | Typically 6.3A to 10A (depends on specific series) | | **Voltage Rating** | 250V AC | | **Mounting Type** | Panel Mount (Nut and Washer) | | **Termination Style** | Solder terminals or Quick Connect | | **Material** | Thermoplastic (Body), Copper Alloy (Contacts) | --- ### 2. Key Features The "R3-NM4-R" designation usually refers to a specific configuration within a series: * **Knob Type:** The "R" at the end often signifies a **Screw-type knob** or a **Finger-grip** release mechanism, allowing users to remove the fuse without specialized tools. * **Insulation:** High dielectric strength to prevent arcing between the fuse terminals and the metal chassis of the device. * **Flammability Rating:** Usually UL 94 V-0, ensuring the plastic body is self-extinguishing. * **Safety Standards:** Compliant with IEC 60127-6 and UL 4248-1. --- ### 3. Application Areas These parts are commonly found in: 1. **Industrial Equipment:** Control panels and power supplies. 2. **Consumer Electronics:** High-end audio amplifiers and desktop appliances. 3. **Medical Devices:** Laboratory equipment requiring user-serviceable protection. 4. **Telecommunications:** Network hubs and power distribution units. --- ### 4. Schematic Representation In a circuit diagram, the part serves as the interface between the power line and the internal circuitry: ```text [Line In] ----| Terminal 1 |---[ FUSE ]---| Terminal 2 |----> [Internal Circuit] ```