The **63-R2** is a widely used industrial-grade electronic component, most commonly associated with **Littelfuse 63 Series (High-Voltage Fuses)** or specific **Relay/Resistor** configurations depending on the manufacturer. However, the most prominent electronic part with this designation is the **Littelfuse 63 Series 2AG Fast-Acting High-Voltage Fuse**. --- ## 1. Technical Specifications The "63-R2" typically refers to the **2-Ampere** version of the 63 Series fuse. Below are the core technical parameters: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 2 Amps | | **Voltage Rating (AC)** | 500V | | **Voltage Rating (DC)** | 300V | | **Fuse Type** | Fast-Acting (F) | | **Material** | Glass Body / Nickel-plated Brass Caps | | **Form Factor** | 2AG (Approx. 4.5mm x 15mm) | | **Interrupting Rating** | 50A @ 500VAC | --- ## 2. Key Features and Design The 63-R2 is designed for compact spaces where high voltage protection is required but standard 3AG (6x30mm) fuses are too large. * **Fast-Acting Response:** It is engineered to open quickly under overload conditions, protecting sensitive semiconductor components. * **Compact 2AG Size:** Provides a smaller footprint on PCBs compared to traditional household or automotive fuses. * **Safety Approvals:** Typically UL Recognized and CSA Certified for industrial use. --- ## 3. Common Applications The 63-R2 is found in high-voltage environments where precision and size are critical: 1. **Industrial Power Supplies:** Protecting the primary side of AC/DC converters. 2. **Instrumentation:** Used in multimeters or oscilloscopes that handle high-voltage inputs. 3. **Lighting Ballasts:** Protecting circuitry in specialized high-intensity discharge (HID) lighting. 4. **Telecom Equipment:** Guarding against surge events in networking hardware. --- ## 4. Part Numbering Breakdown If you are looking at a Littelfuse datasheet, the code breaks down as follows: ```text 63 - R2 | | | └── Current Rating: 2 Amps (R = Decimal/Value indicator) └─────── Series Number: 2AG High-Voltage Fast-Acting ``` ---