Based on the part number **48NDR-0B3-R**, this component is a specific type of **Miniature Relay** typically manufactured by companies like Fujitsu or components within that electronics ecosystem. --- ### 1. Technical Specifications Overview The part number follows a standard coding convention for electromechanical relays. Below is a breakdown of its primary characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | Electromechanical Relay | | **Contact Form** | 2 Form C (DPDT - Double Pole Double Throw) | | **Coil Voltage** | 48V DC | | **Terminal Type** | Through-hole (PCB Mount) | | **Contact Rating** | Usually 2A @ 30VDC / 0.5A @ 125VAC | | **Environmental** | RoHS Compliant (indicated by the "-R" suffix) | --- ### 2. Part Number Breakdown To understand the functionality, we can dissect the alphanumeric code: * **48**: Represents the **Nominal Coil Voltage**. In this case, it requires 48V DC to energize the coil and switch the contacts. * **N**: Often signifies the series (Miniature or Signal type). * **D**: Generally indicates **Standard Sensitivity** or a specific construction type (like "Dual" for DPDT). * **R**: Specifies the **Contact Arrangement** (Standard layout). * **0B3**: This is a manufacturer-specific code for **Contact Material** (often Gold-overlay silver nickel) and sealing type (Plastic sealed). * **-R**: Indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 3. Key Features * **High Sensitivity:** Designed to operate with low power consumption despite the 48V coil rating. * **Bifurcated Contacts:** The "B" in the code often suggests bifurcated (split) contacts, which increase reliability when switching low-level signals. * **Compact Footprint:** These are "Miniature" relays, making them ideal for high-density PCB layouts. * **Washable Construction:** Most variants in this series are "Plastic Sealed," allowing the PCB to be washed after soldering without damaging the internal mechanics. --- ### 4. Common Applications Due to its 48V coil and DPDT configuration, this part is frequently found in: 1. **Telecommunications:** Switching signal lines in PBX or network hardware. 2. **Industrial Controls:** Interfacing low-power logic with higher voltage actuators. 3. **Security Systems:** Control panels that operate on 48V backup or power-over-ethernet systems. 4. **Test & Measurement:** Routing signals within automated test equipment (ATE).