The part number **48NDVA-4YA3-R** refers to a high-density, automotive-grade high-voltage contactor (DC Relay), typically manufactured by **Fujitsu** (often under the FBR series or specific EV relay lines). These components are critical in Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) systems for managing battery power. --- ### 1. Technical Specifications The following table outlines the typical electrical and mechanical characteristics for this series: | Parameter | Specification | | :--- | :--- | | **Component Type** | High Voltage DC Contactor / Relay | | **Coil Voltage** | 12V DC (Standard for automotive control) | | **Contact Arrangement** | 1 Form A (SPST-NO - Single Pole Single Throw, Normally Open) | | **Max Switching Voltage** | Up to 450V - 500V DC | | **Continuous Current** | Approx. 40A - 60A (Varies by thermal conditions) | | **Inrush Current** | Capable of handling high peak loads | | **Mounting Type** | Through-hole (PCB) or Bolt-on (depending on sub-variant) | --- ### 2. Key Features * **Arc Extinguishing:** These relays often contain a pressurized gas (like Hydrogen or Nitrogen) or permanent magnets to "blow out" the electric arc that forms when disconnecting high-voltage DC. * **Compact Design:** Designed for space-constrained Power Distribution Units (PDUs). * **AEC-Q200 Qualified:** Meets the rigorous stress-testing requirements for automotive electronic components. * **Polarity Dependency:** Usually features specific + and - terminals for the high-voltage side to optimize arc suppression. --- ### 3. Common Applications This part is predominantly used in the power management systems of electrified vehicles: 1. **Main Battery Disconnect:** Used to isolate the high-voltage battery from the rest of the vehicle for safety. 2. **On-Board Charger (OBC):** Managing the connection between the charging port and the battery pack. 3. **Pre-charge Circuits:** Limiting inrush current to protect capacitors before the main contactors close. 4. **DC/DC Converters:** Controlling power flow between high-voltage and low-voltage (12V) systems. --- ### 4. Part Number Breakdown (General) While specific to Fujitsu's internal coding, the suffix **"-R"** typically indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards, ensuring the part is lead-free. ---