Mean Well NDR-120-24 24V 5A 120W DIN Rail Power Supply

A. Product Overview

The Mean Well NDR-120-24 24V 5A 120W DIN Rail SMPS belongs to the NDR-120 series of industrial single output power supplies.

It provides a nominal 24V DC output, rated current of 5A and maximum rated power of 120W. The output voltage can be adjusted from approximately 24V to 28V DC, which provides flexibility for different 24V industrial systems.

The power supply accepts a wide 90 to 264V AC input and can also operate from 127 to 370V DC input. The 24V model provides approximately 88 percent typical efficiency.

Its metal housing measures approximately 40 x 125.2 x 113.5 mm, allowing compact installation inside industrial control cabinets. It mounts directly on TS35/7.5 or TS35/15 DIN rails.

The NDR-120 series also provides short circuit, overload, overvoltage and overtemperature protection.

B. Working Principle

The Mean Well NDR-120-24 works as an industrial switch mode AC to DC power supply.

According to the block diagram on page 3 of the datasheet, incoming power first passes through an EMI filter and rectifier stage. The converted power then enters a high frequency switching circuit operating at approximately 70 kHz.

The switching stage transfers energy through an isolated transformer. On the secondary side, the electrical signal is rectified and filtered to produce a stable DC output.

A detection circuit continuously monitors the output and communicates with the PWM control circuit. The design also incorporates overload protection, overtemperature protection, overvoltage protection and overcurrent protection.

This closed loop regulation helps maintain a stable 24V DC output when input voltage or connected load changes within the specified operating limits.

C. Why It Is Used

The Mean Well NDR-120-24 is used when industrial equipment requires a reliable and regulated 24V DC power supply from an AC mains source.

Its 5A capacity allows it to supply up to 120W of connected equipment. Typical 24V industrial loads can include PLCs, HMI systems, transmitters, proximity sensors, photoelectric sensors, relays, controllers, interface modules, communication equipment and other automation devices, provided the total load remains within the power supply rating.

Mean Well specifically lists applications including:

Industrial control systems
Semiconductor fabrication equipment
Factory automation
Electromechanical apparatus

The DIN rail mounting design makes it especially useful in automation panels and industrial electrical cabinets.

D. Suitable Buyers

The Mean Well NDR-120-24 is suitable for:

Industrial automation companies
Control panel manufacturers
PLC system integrators
Electrical panel builders
Machine manufacturers
OEM equipment manufacturers
Factory maintenance departments
Semiconductor equipment manufacturers
Electrical contractors
Building automation companies
Instrumentation companies
Industrial system integrators
Automation distributors
Industrial equipment suppliers

It is particularly suitable for buyers searching for a 24V 5A 120W DIN rail SMPS for industrial automation and control panel applications.

Frequently Asked Questions

1. What is the output voltage of Mean Well NDR-120-24?
The nominal output voltage is 24V DC.

2. What is the rated current of NDR-120-24?
The rated output current is 5A.

3. What is the rated power of Mean Well NDR-120-24?
The rated output power is 120W.

4. What is the input voltage range?
The NDR-120-24 accepts 90 to 264V AC and 127 to 370V DC input.

5. Can the output voltage be adjusted?
Yes. The 24V model can be adjusted from approximately 24V to 28V DC.

6. What is the efficiency of NDR-120-24?
The typical efficiency of the 24V model is approximately 88 percent.

7. Does the NDR-120-24 have short circuit protection?
Yes. The NDR-120 series includes protection against short circuit, overload, overvoltage and overtemperature.

8. How does overload protection work?
Overload protection operates at approximately 105 to 130 percent of rated output power using constant current limiting and automatically recovers when the fault condition is removed.

9. What is the operating temperature range?
The specified working temperature range is minus 20°C to 70°C, subject to the manufacturer's derating conditions.

10. Does the Mean Well NDR-120-24 require a cooling fan?
No. The NDR-120 series uses free air convection cooling.

11. What are the dimensions of NDR-120-24?
The dimensions are approximately 40 x 125.2 x 113.5 mm.

12. Which DIN rail can be used with NDR-120-24?
It is designed for TS35/7.5 or TS35/15 DIN rail mounting.

13. Is NDR-120-24 suitable for PLC control panels?
Yes. Its regulated 24V DC output, 5A capacity and DIN rail mounting make it suitable for many PLC and industrial control panel applications.

14. Can the NDR-120-24 be used for sensors and transmitters?
Yes. It can supply compatible 24V DC sensors, transmitters and other automation equipment as long as the combined load stays within the 5A and 120W rating.

15. Does NDR-120-24 support DC input?
Yes. It supports approximately 127 to 370V DC input. The datasheet specifies DC operation through the AC input terminals.

16. What terminals are available on the NDR-120-24?
The unit provides input terminals for frame ground, AC line or DC positive, and AC neutral or DC negative. Separate output terminals provide negative and positive DC output connections.

17. Is Mean Well NDR-120-24 suitable for factory automation?
Yes. Factory automation is specifically listed by Mean Well as an intended application for the NDR-120 series.

18. What is the difference between NDR-120-24 and a normal 24V SMPS?
The NDR-120-24 is specifically designed as an industrial DIN rail power supply with a slim metal enclosure, wide input range, industrial protection functions and direct DIN rail mounting for control cabinets and automation panels.