MCC Panels

Data Centers

High-reliability MDB, PCC, ATS (STS), metering, APFC, BTS, DC distribution

Data Centers

Data centers require low-voltage switchgear and controlgear assemblies engineered for continuous operation, selective coordination, and maintainability under Tier III and Tier IV availability strategies. The core architecture typically combines main distribution boards (MDBs), power control centers (PCCs), ATS systems, static transfer switches (STS), metering panels, power factor correction panels, DC distribution panels, and busbar trunking systems feeding UPS plants, chillers, CRAH units, IT halls, and auxiliary loads. In accordance with IEC 61439-1 and IEC 61439-2, assemblies must be designed, verified, and temperature-rise tested for the declared rated current, short-circuit withstand strength, and form of separation, often Form 3b or Form 4b where operational segregation and maintenance continuity are critical. Common incoming devices include ACBs up to 6300 A and high-rupturing-capacity MCCBs for feeders, with electronic trip units and communication interfaces for selective protection and remote monitoring. For critical IT loads, STS panels and dual-source ATS arrangements must support fast source transfer and avoid nuisance outages while maintaining compatibility with UPS topology, generator sets, and static bypass paths. Busbar trunking systems are widely used to distribute power to server rooms and white space because they reduce installation time, improve scalability, and support tap-off flexibility compared with fixed cabling. For DC-side applications, especially battery strings, rectifier outputs, and emerging 380 V DC architectures, dedicated DC distribution panels and suitably rated protection devices are required to manage polarity, fault interruption, and arc energy control. Protection relays, multifunction power analyzers, and revenue-grade meters enable power quality diagnostics, harmonic monitoring, and PUE optimization across the facility. Environmental design is equally important. Data centers may impose high internal heat loads, raised-floor airflow constraints, stringent ingress protection requirements, and limited maintenance access. Assemblies are therefore specified with forced ventilation, temperature monitoring, anti-condensation heaters where needed, and carefully managed cable entry to preserve IP degree and segregation. In seismically active regions, panels and busbar systems may require seismic qualification, anchoring, and mechanical bracing to maintain integrity during and after an event. For EMC-sensitive sites, compliance with IEC 61000 is essential to ensure immunity and emission control for metering, PLCs, relays, and networked automation systems. Where UPS rooms, battery areas, or fuel-handling zones present fire or explosion considerations, IEC 61641 arc-fault mitigation practices and IEC 60079 hazardous-area principles may be relevant to adjacent equipment selection and enclosure design. Patrion’s custom-engineered panel solutions for data centers are typically built to IEC 61439-2 with optional IEC 61439-3 sub-distribution sections and IEC 61439-6 busbar trunking interfaces, allowing integrated solutions from utility incomer to rack-level distribution. Designs may also be adapted to UL 891 and CSA requirements for projects requiring North American compliance. The result is a coordinated electrical infrastructure that supports expansion, minimizes downtime, and provides the monitoring and protection needed for modern hyperscale, colocation, enterprise, and edge data center operations.

Panel Types for This Industry

Frequently Asked Questions

A data center usually combines MDBs, PCCs, ATS panels, STS panels, metering panels, APFC panels, DC distribution panels, and busbar trunking systems. The MDB and PCC handle utility and generator incomers, while ATS and STS manage source transfer for essential loads. Metering panels and multifunction analyzers support PUE tracking, load trending, and power-quality diagnostics. APFC panels are used where harmonic conditions allow, or detuned capacitor banks are specified. All of these assemblies should be designed as verified IEC 61439 panels with the correct rated operational current, short-circuit withstand rating, and segregation level for the site’s uptime philosophy.
IEC 61439-1 sets the general rules for low-voltage switchgear assemblies, while IEC 61439-2 applies to power switchgear and controlgear assemblies such as MDBs and PCCs. For data centers, the panel builder must verify temperature rise, dielectric properties, short-circuit strength, and protective circuit performance for the declared configuration. Form of separation is important, with Form 3b or Form 4b commonly selected to maintain service continuity during maintenance. If the project includes busbar trunking or sub-distribution sections, IEC 61439-6 and IEC 61439-3 may also apply. Proper documentation and design verification are essential for commissioning and audit readiness.
Short-circuit ratings depend on the available fault level at the point of installation, transformer size, generator contribution, and the selectivity strategy. In data centers, MDBs and PCCs are often specified with busbar systems rated from 50 kA to 100 kA for 1 second, with peak withstand values coordinated to the upstream protective device and network impedance. Incoming ACBs with electronic trip units are commonly used to achieve discrimination between utility, generator, UPS, and feeder circuits. The final rating must be verified to IEC 61439 through a valid design verification and matched with the protective device manufacturer’s data under IEC 60947.
An STS is preferred when the load cannot tolerate a normal transfer delay and both sources are already conditioned, typically after independent UPS paths. It transfers in milliseconds and is used for critical IT loads where even a brief interruption is unacceptable. A standard ATS is suitable for generator-backed mechanical loads, lighting, or noncritical auxiliary systems where transfer time can be longer. In practice, STS panels are deployed at the distribution point feeding dual-cord servers or critical rack groups, while ATS devices manage standby power for support loads. Selection should consider source synchronization, fault-clearing coordination, and IEC 60947 device performance.
Busbar trunking systems provide modular, high-current distribution with lower installation time and easier expansion than large cable bundles. They are especially useful in hyperscale and colocation facilities where load density changes frequently and new IT rows are added over time. A busbar trunking system can be routed overhead or under raised floors and tapped off close to the load, reducing voltage drop and simplifying maintenance. In IEC terms, the system should be coordinated with IEC 61439-6, with verified current rating, temperature rise, and short-circuit performance. It also supports cleaner segregation and better cable management in constrained white-space environments.
Typical devices include air circuit breakers, moulded-case circuit breakers, protection relays, surge protection devices, and multifunction power analyzers. ACBs are used on incomers and bus couplers because they support adjustable protection and high short-circuit ratings. MCCBs are common for feeders to UPSs, chillers, CRAC/CRAH units, and auxiliary systems. Protection relays can provide generator and transformer monitoring, while power analyzers measure harmonics, THD, voltage unbalance, kW, kVA, and PF for energy optimization. Surge protection devices are important at service entries and sensitive distribution points. These devices should comply with IEC 60947 and be integrated into a coordinated protection philosophy.
Yes. Data centers often contain high fault-level switchgear with frequent access requirements, so arc-flash mitigation and safe maintenance design are important. IEC 61641 guidance is relevant for arc-fault testing and internal arc considerations in enclosed assemblies, particularly where personnel may work near energized equipment. In seismic regions, panels, busbar systems, and battery cabinets may require anchoring, bracing, and verified seismic qualification to maintain serviceability during and after a seismic event. The enclosure, supports, and cable entry details must be coordinated with the structural engineer and the panel manufacturer to avoid mechanical failure or loss of segregation during abnormal events.
Yes. Many data center projects require either IEC-compliant assemblies or North American compliance depending on the owner’s specification and location. For IEC projects, the main reference is IEC 61439, with IEC 60947 for components, and IEC 61000 for EMC performance. For North American projects, UL 891 and CSA requirements may govern the switchboard construction, spacing, marking, and testing. Patrion can engineer custom panels to match the project standard set, but the design basis must be fixed early because component selection, enclosure dimensions, busbar clearances, and verification tests differ between IEC and UL/CSA frameworks.

Ready to Engineer Your Next Panel?

Our team of electrical engineers is ready to design, build, and deliver your custom panel solution — fully compliant with international standards.