Many people think the core equipment in a data center is just server racks. From an engineering perspective, however, what truly supports stable data center operation is not just servers, but a complete and complex infrastructure system—most of which is managed by various control cabinets and control systems.

In a complete data center project, common control cabinets are mainly used in power distribution, cooling, monitoring, fire protection, automation, and other systems.

I. Power Distribution Control Cabinets

The power system is the most critical infrastructure in a data center. To ensure continuous and stable operation of server equipment, data centers usually adopt a multi-level power distribution architecture.

Common equipment includes:

• High-voltage switchgears

Used for utility power access and power distribution. In some projects, Schneider Electric SM6 or RM6 medium-voltage switchgear is commonly used.

• Low-voltage switchgears

Responsible for supplying power to UPS systems, air conditioning systems, and IT loads. Data centers often use Schneider Electric Blokset or Okken low-voltage switchgear, equipped with Masterpact MTZ air circuit breakers.

• Row Power Panels (RPP / PDU)

Located at the front of server rack rows for refined power distribution and current monitoring. Typical equipment includes the Schneider Electric APC Rack PDU series.

These power distribution devices form the core structure of the data center power system.

II. UPS & Battery System Control Cabinets

To deal with utility power outages, data centers must deploy UPS (Uninterruptible Power Supply) systems.

Common equipment includes:

• UPS control cabinets

Used to control UPS operation and bypass switching. Large data centers often adopt Schneider Electric Galaxy VX, Galaxy VL, or Galaxy VM UPS systems.

• Battery Management System (BMS) cabinets

Used to monitor battery pack voltage, current, and temperature to ensure safe operation of the battery system.

In large data centers, the battery system capacity is huge, so battery monitoring and management systems are particularly important.

III. HVAC Control Cabinets

Servers generate a large amount of heat during operation, so data centers require a stable cooling system to maintain temperature and humidity.

Common systems include:

• Precision air conditioning (CRAC / CRAH)

• Chilled water systems

• Cooling tower systems

Corresponding control equipment usually includes:

• Air conditioning control cabinets

For the operation and monitoring of precision air conditioners.

• Cooling station control cabinets

Used to control chillers and water pump systems. In some projects, Schneider Electric Modicon PLC or SpaceLogic controllers are used for system control.

These devices are usually connected to and managed by a Building Automation System (BAS).

IV. Environment Monitoring System Cabinets

Data centers require continuous monitoring of the room environment, such as:

• Temperature and humidity

• Water leakage detection

• Smoke alarms

• Power parameters

• Equipment status

Therefore, environment monitoring system cabinets are usually installed to house monitoring servers and communication equipment.

In large data centers, these systems are usually connected to a DCIM platform, such as Schneider Electric EcoStruxure IT or Data Center Expert, for unified monitoring and operation management.

V. Fire Protection & Safety Control Cabinets

Data centers have extremely high safety requirements, so fire protection systems are essential.

Common equipment includes:

• Gas fire suppression control cabinets

Used to control FM-200 or IG541 gas fire extinguishing systems.

• Fire linkage control cabinets

In the event of a fire, they trigger the cutoff of partial power supplies and shut down air conditioning systems to prevent fire spread.

These systems are directly related to the safety of computer room equipment and data.

VI. Intelligent & Automation Control Cabinets

As data centers scale up, more and more projects adopt automated management systems, such as:

• Building Automation System (BAS)

• Data Center Infrastructure Management (DCIM)

• Energy Management System (EMS)

These systems usually realize equipment linkage and centralized management through PLC or DDC control cabinets, such as Schneider Electric SpaceLogic DDC controllers or Modicon PLC series.

Conclusion

A data center is not just a collection of server equipment, but a complex infrastructure composed of power, cooling, monitoring, security, and automation systems.

The core nodes of these systems are various control cabinets and control systems. Although less visible than server racks, they play a vital role in ensuring the stable operation of data centers.