Einführung
As a B2B buyer who purchases power solutions for data centre auxiliary systems, you know very well that reliability is not possible. The global data centre auxiliary equipment market is estimated to be 67.53 billion US dollars in 2025, and it is expected to rise to 164.49 billion US dollars by 2033. The auxiliary equipment in your hand – refrigeration, security, fire protection, access control, etc. – must all be supported by stable AC-DC power supplies. Once something goes wrong in this link, it may trigger a chain reaction, downtime, data loss, and loss of money. This guide will take you to see what AC-DC power supply does in such systems, how to choose it appropriately, and why WEHO is a brand worth considering.
What is the AC-DC power supply in data centre auxiliary equipment?
AC-DC power supply is to turn the AC power in the main power grid of the facility into the direct current required by electronic equipment. Most of the auxiliary equipment in the data centre – sensors, controllers, cameras, access control panels – use low-voltage DC, usually 12V, 24V or 48V. AC-DC power supply is to build Build a bridge between the power grid and these systems.
Why is this important to you? Because although auxiliary equipment is not mentioned as often as servers and storage devices, it ensures the safe and efficient operation of the whole facility. If the power supply in the cooling controller is broken, it may overheat. If the power supply of the security camera goes wrong, there will be a monitoring dead angle. The power supply on the fire panel Unstable will delay the emergency response. The AC-DC power supply is the key role that has been working silently behind every auxiliary system in your data centre.
The main applications of AC-DC power supply in data centre auxiliary systems
AC-DC power supply is widely used in data centres, which is basically the basis for supporting various auxiliary systems. The following application scenarios are what you need to pay attention to.
Cooling control system
The cooling system almost consumes 30 to 40th of the total energy consumption of the data centre. The controllers, sensors and variable-speed drivers in charge of the cooling equipment have to rely on direct current to run. If the AC-DC conversion is not reliable, the cooling system will not be able to respond to temperature changes in time. Hot spots are easy to emerge, and the equipment may also have an accident. Barrier, the efficient power supply can also help reduce the conversion loss and pull the PUE up.
Security and monitoring system
Cameras, video recording equipment and monitoring stations all need to get clean and stable direct current around the clock. If the power supply fluctuates slightly, the camera may restart or miss the key picture. For the security system, whether the power supply is reliable is basically a matter of safety.
Fire-fighting system
Fire alarms, smoke detectors and controllers of fire extinguishing systems are all key equipment. They must be able to operate normally in an emergency. Fire-fighting standards also require these systems to be equipped with a specially reliable power supply. The AC-DC power supply to the fire-fighting system must meet strict safety and compliance requirements.
Access control system
Card readers, electronic locks and access control controllers all use low-voltage direct current. If the power supply is broken, employees will not be able to enter, and unauthorised access will also become a risk. For large data centres with hundreds of access control points, using a better AC-DC power supply to do centralised power distribution can simplify management and improve operating time.
Network monitoring and sensing system
There are environmental sensors everywhere in the data centre – temperature, humidity, airflow, water leakage detection, etc. They transmit data to the building management system or DCIM platform. They rely on direct current all day long. If the power supply is not reliable, the monitoring data will be cut off. Some problems may be covered when they are developing. It’s quite serious now.
Choose a suitable AC-DC power supply solution for the industrial environment
Choosing AC-DC power supply for the data centre auxiliary system is not just one you can use. What you are looking for is an industrial-grade product specially designed for continuous operation, wide temperature range and complex electrical environment. The following three forms are relatively common in the market.
Enclosed switching power supply
There is a metal or plastic shell outside the closed power supply, equipped with input and output terminals, which are generally installed in the control cabinet or equipment chassis. If you need to supply power to independent equipment, such as security DVR or network switch, this is more cost-effective. The output voltage of WEHO’s enclosed series is from 1 2V covers up to 220V, and the power can reach up to 15000W, which is more flexible in the face of different auxiliary loads.
DIN rail power supply
The DIN rail power supply is directly stuck on the standard DIN rail in the electrical cabinet, which is the most used in control panel and automation systems. The DIN rail power supply is more suitable for data centre auxiliary equipment, because it saves space, is easy to install and convenient to replace. The MTBF level of many DIN rail power supplies is It is relatively high. Some models can reach more than 500,000 hours, which is very important for a 24-hour data centre.
Special power supply for security
The special power supply for security is a model specially made for CCTV and access control systems. It generally has the functions of backup battery input, independent fuse for each output and fault indicator light. With these configurations, even if the power grid is short-circuited, the security equipment can continue to be online. The redundant guarantee required by the security system depends on it.
Factors that must be considered when choosing an AC-DC power supply
When choosing AC-DC power supplies for data centre auxiliary equipment, there are several key factors that you can’t avoid. The following are the things you need to weigh well.
Effizienz
Efficiency is much more important than you think. If a power supply converts AC to direct current with 90% efficiency, then 10% of the input energy is wasted into heat. Hundreds of auxiliary equipment in the data centre add up these losses, and the electricity cost will become higher, and the cooling load will also rise. Find the efficiency in percent. The power supply of more than 89, the product efficiency of 80 PLUS Titanium certification in high-performance applications can reach 96%, and the heat load and energy consumption can be significantly reduced.
Schutzfunktion
A reliable power supply does more than just convert voltage—it should also protect itself and your equipment from unexpected faults. Here are the four essential protection features you should look for.
|
Schutz |
What It Does | Why You Need It |
| Over-Voltage (OVP) | Cuts output when voltage is too high | Prevents damage from voltage spikes |
| Over-Current (OCP) | Limits current to a safe level | Stops short circuits from burning cables |
| Short-Circuit (SCP) | Auto-shuts during a short; recovers after | Protects equipment from catastrophic failure |
| Over-Temperature (OTP) | Reduces or shuts off when too hot | Prevents overheating and extends lifespan |
Operating temperature range
The temperature difference in different places in the data centre is not small, especially next to the cooling equipment or in the area where the equipment is piled up. The power supply should have an industrial-grade temperature range rating, usually at least minus 25 degrees to minus 70 degrees. The wider the temperature range, the more flexible the installation.
Eingangsspannungsbereich
If the input voltage range is wide, such as 90VAC to 264VAC, the same power supply can be used in different countries, and it can also withstand the situation of voltage drop or temporary drop. If it is purchased for several stations, inventory management can also be much simpler.
MTBF and reliability
MTBF is the average failure-free time, which is a statistic of expected reliability. The higher the MTBF, the lower the probability of failure. The MTBF rating of the power supply for data centre auxiliary equipment should be above 100,000 hours, and it would be better if it could reach 500,000 hours or more. Some manufacturers such as WEHO use Industrial-grade components are used to make products, and the service life is relatively long.
Certify
Confirm that the power supply has the certifications required by your target market, UL (North America), CE (Europe), CB (International) and CCC (China). These certifications for data centre auxiliary systems are usually indispensable in terms of insurance and compliance.
Why are WEHO AC-DC power solutions trusted in industrial power systems?
What you really need is a supplier who understands the industry and what the data centre environment needs. WEHO (Zhejiang Weihao Electronics Co., Ltd.) has been working in industrial power supply for more than 16 years. It has SGS and BV certification, and can be verified in terms of qualifications.
WEHO’s AC-DC switching power supply product line covers the output voltage from 12V to 220V, and the maximum power can reach 15000W. There are several main series. The closed power supply is for independent auxiliary equipment, which is cost-effective. There are single-way and multiplex outputs to choose from. The DIN rail power supply is installed in the control cabinet. The efficiency of the province is 89%, and the special power supply for security is specially made for CCTV and access control systems.
They have their own engineering team, which can take on customised projects and OEM/ODM work. They can adjust the output voltage, change the shell design or functional combination according to your specific application. As an internationally certified Chinese manufacturer, WEHO has not only manufacturing experience but also a quality control system that meets global standards. If you are Looking for a reliable AC-DC power supply supplier for the data centre auxiliary system, you can have a look at this brand.
FAQ
Why is AC-DC conversion efficiency critical for auxiliary systems?
Efficiency directly impacts your operating costs and cooling load. A 90% efficient supply wastes 10% of input energy as heat. In a data center with hundreds of auxiliary devices, those losses add up to significant electricity and cooling expenses. High-efficiency supplies (94-96%) reduce both energy bills and thermal load.
Can DIN rail AC-DC power supplies operate in 24/7 environments?
Yes, when properly specified. Industrial DIN rail power supplies are designed for continuous operation. Look for units with high MTBF ratings (>500,000 hours) and wide operating temperature ranges. Many are built with industrial-grade components and protection features that make them suitable for around-the-clock use in data centers.
What protection features are required for industrial AC-DC power systems?
At minimum, you should look for over-voltage protection (OVP), over-current protection (OCP), short-circuit protection (SCP), and over-temperature protection (OTP). These features prevent the power supply from damaging itself or the connected equipment during fault conditions, reducing downtime and repair costs.
Does WEHO support customized AC-DC output voltage and enclosure design?
Yes. WEHO has in-house engineering capabilities to support custom designs. They can adjust output voltage, current, and power ratings, as well as modify enclosure designs to fit your specific installation requirements. For OEM and ODM projects, WEHO offers flexible manufacturing services.
Abschluss
Choosing the right AC-DC power supply for your data center auxiliary equipment isn’t just about finding a box that converts voltage. It’s about reliability, efficiency, protection, and long-term partnership. Your cooling, security, fire protection, access control, and monitoring systems all depend on stable DC power to function.
Focus on efficiency to cut energy costs and cooling load. Verify protection features to prevent equipment damage. Check MTBF ratings for long-term reliability. And choose a manufacturer—like WEHO—with the certifications, engineering capability, and product range to support your specific needs.
A quality AC-DC power supply may cost a bit more upfront, but it pays for itself in avoided downtime, lower energy bills, and fewer service calls. For B2B buyers managing data center infrastructure, that’s an investment worth making.
