MEAN WELL NDR-120-48 Advanced Switching Power Supply 120W 48V 2.5A
The MEAN WELL NDR-120-48 is a robust 120W industrial switching power supply engineered for demanding applications, delivering a stable 48V DC output at 2.5A. Its advanced design prioritizes reliability, efficiency, and safety, making it a preferred choice for powering critical automation and control systems. Key advantages include its high efficiency, compact design, and comprehensive protection features, ensuring consistent performance in challenging industrial environments. The unit boasts a wide operating temperature range, excellent thermal performance due to its free-air convection cooling, and compliance with international safety and EMC standards.
Product Specifications
| Parameter | Value |
| :--------------------- | :---------------- |
| Output Voltage | 48V DC |
| Rated Current | 2.5A |
| Rated Power | 120W |
| Input Voltage Range | 90-264V AC |
| Efficiency | Up to 89% |
| Operating Temperature | -30°C to +70°C |
| Dimensions (L x W x H) | 125.5 x 78 x 33.5 mm |
| Protection Features | Short circuit, Overload, Over voltage, Over temperature |
| Cooling | Free air convection |
| Certifications | UL, TUV, CB, CE |
Core Features & Market Positioning
The MEAN WELL NDR-120-48 distinguishes itself through its exceptional power density and robust build quality, crucial for industrial automation. Its 89% peak efficiency minimizes energy waste and heat generation, contributing to a longer operational lifespan and reduced cooling requirements. The slim 33.5mm profile allows for easy integration into tight control cabinets and DIN rail mounting systems, a significant advantage in space-constrained industrial settings. MEAN WELL's reputation for reliability is further solidified by the NDR-120-48's comprehensive protection circuitry, safeguarding sensitive equipment from electrical anomalies and ensuring uninterrupted operation.
Key Application Scenarios
This power supply is ideally suited for a wide array of industrial applications requiring a stable 48V DC output. It excels in powering Programmable Logic Controllers (PLCs), motor drives, industrial sensors, and various automation equipment in manufacturing, process control, and building automation systems. Its wide input voltage range (90-264V AC) ensures compatibility with global power grids, making it a versatile solution for international deployments. The -30°C to +70°C operating temperature range allows for reliable performance in environments subject to significant temperature fluctuations, from cold storage facilities to hot factory floors.
Practical System Integration Guidance
Integrating the MEAN WELL NDR-120-48 into existing industrial systems is straightforward. For DIN rail mounting, simply slide the power supply onto a standard TS-35/7.5 or TS-35/15 rail. Connect the AC input terminals (L, N) to the mains supply and the DC output terminals (+V, -V) to the load, observing correct polarity. Ensure that the input voltage is within the specified range (90-264V AC). For overload protection, the unit features a constant current limiting mode, meaning it can withstand momentary overloads without damage, but sustained overloads above 105-150% of rated power will trigger shutdown.
Operation and Risk Mitigation
Safe operation of the MEAN WELL NDR-120-48 requires adherence to standard electrical safety practices. Always disconnect power before making or breaking connections. Ensure proper ventilation; while designed for free-air convection, avoid obstructing airflow around the unit. The power supply incorporates over-temperature protection (OT) which will cause it to shut down if internal temperatures exceed safe limits, automatically restarting once it cools down. Short circuit protection (SCP) and overload protection (OLP) prevent damage to the power supply and connected equipment during fault conditions.
Scalability & Long-Term Value
The NDR-120-48 offers excellent long-term value through its robust design and MEAN WELL's commitment to product longevity. Its standardized form factor and output voltage make it easily replaceable or upgradeable within existing 48V DC systems. While not directly an IIoT device, its reliable power delivery is fundamental for the stable operation of IIoT gateways, sensors, and control systems. The high efficiency contributes to lower operational costs over the product's lifespan, and its compliance with major international certifications simplifies system integration and regulatory approval processes, providing peace of mind for long-term industrial deployments.
Frequently Asked Questions
What is the warranty period for the MEAN WELL NDR-120-48?
MEAN WELL typically offers a 3-year manufacturer's warranty on their NDR series power supplies. This warranty covers defects in materials and workmanship under normal operating conditions. It reflects the company's confidence in the product's durability and reliability for industrial use.
This warranty period ensures that users have protection against premature component failure. Always refer to the specific product documentation or the retailer's terms for the exact warranty duration and conditions applicable to your purchase.
How do I connect the MEAN WELL NDR-120-48 to a DIN rail?
Mounting the NDR-120-48 onto a DIN rail is a simple mechanical process. First, ensure the rail is securely fastened. Then, align the mounting slot on the back of the power supply with the top edge of the DIN rail.
Apply gentle upward pressure to clip the unit onto the rail. A secure click indicates proper engagement. You can also use the integrated retaining clip at the bottom of the power supply for added security, especially in applications prone to vibration.
What are the key protection features of the NDR-120-48?
The NDR-120-48 is equipped with critical protection circuits to ensure operational safety and longevity. It includes short circuit protection (SCP), which safeguards against damage if the output terminals are accidentally shorted. Overload protection (OLP) prevents damage from excessive current draw.
It also features over-voltage protection (OVP) to shield connected devices from voltage spikes exceeding the set limit. Additionally, over-temperature protection (OTP) will shut down the unit if internal temperatures rise to unsafe levels, preventing thermal damage.
Can the MEAN WELL NDR-120-48 be used in high-humidity environments?
While designed for industrial use, direct exposure to excessive moisture or very high humidity without proper enclosure might affect performance. The power supply itself does not have an IP rating for water ingress protection. It should be installed in a suitable enclosure that protects it from environmental factors.
For applications with high humidity concerns, consider using an industrial enclosure with adequate ventilation and moisture-resistant properties. Proper installation ensures the power supply operates reliably within its specified environmental parameters.
What is the typical efficiency of the NDR-120-48 at half load?
The MEAN WELL NDR-120-48 boasts high efficiency, often reaching up to 89% at its nominal input voltage and full load. Efficiency at half load is generally even higher, contributing to reduced heat generation and lower energy consumption. This optimized performance makes it an environmentally friendly and cost-effective power solution.
The exact efficiency at half load will vary slightly based on the input voltage, but it remains within a high range. This consistent efficiency is a hallmark of MEAN WELL's design, ensuring stable power delivery with minimal energy loss.
Is the MEAN WELL NDR-120-48 compliant with international safety standards?
Yes, the NDR-120-48 is designed and tested to meet stringent international safety and electromagnetic compatibility (EMC) standards. It typically holds certifications such as UL, TUV, CB, and CE, which are essential for global market access. These certifications ensure the product meets rigorous safety requirements for industrial applications.
Compliance with these standards means the power supply has undergone thorough testing for electrical safety, insulation, and emissions. This assures users of its safe operation and minimal interference with other electronic equipment in a shared environment.
What is the maximum ambient temperature for reliable operation?
The MEAN WELL NDR-120-48 is rated for operation in ambient temperatures ranging from -30°C to +70°C. This wide operating range makes it suitable for many challenging industrial environments, from extremely cold to very warm conditions. However, it's important to ensure adequate free air convection for cooling.
Performance and lifespan can be impacted if operated consistently at the extreme upper limits of this temperature range without sufficient airflow. In densely packed enclosures, consider supplemental cooling solutions if ambient temperatures are expected to remain near +70°C for extended periods.
How does the overload protection work on this power supply?
The NDR-120-48 features a constant current limiting mode for overload protection. This means that if the output current exceeds a safe level (typically between 105% and 150% of rated current), the power supply will limit the output current to a safe value, preventing damage. The output voltage will drop, and the power supply may shut down if the overload persists.
This protection mechanism allows the power supply to handle temporary current surges from motor startups or capacitive loads without shutting down. However, for sustained overloads, the unit will eventually trigger an over-current shutdown to protect itself and the connected load from damage.
Can I use this 48V power supply for devices that require less than 2.5A?
Absolutely. The NDR-120-48 is a voltage-regulated power supply, meaning it will provide a stable 48V DC output regardless of the load, as long as the load's current draw does not exceed 2.5A. Devices that require less current will simply draw the amount they need, and the power supply will deliver it safely.
Using a power supply with a higher current rating than required for the load is common practice in industrial settings. It allows for future expansion, ensures the power supply operates well within its capacity, and can lead to improved efficiency and thermal performance.
What is the significance of the "NDR" series designation?
The "NDR" designation typically signifies MEAN WELL's series of industrial DIN rail mount power supplies. These units are specifically designed for easy installation on standard TS-35 DIN rails and are built for reliability in automation and control applications. The NDR series often features a slim profile and robust enclosures for protection.
Products within the NDR series are engineered with a focus on efficiency, safety, and durability. They are intended to provide stable power for critical industrial equipment, making them a popular choice for control panels and machinery.
