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		Power Distribution Units (PDUs) are used to distribute UPS-protected power to critical loads in raised floor data centers and telecommunication facilities. PDUs fall into three categories: • Traditional power distribution units (PDUs) • Dual input static transfer switch power distribution units (STS PDUs) • Remote power panels (RPPs)

		Traditional PDUs Traditional PDUs contain k-rated transformers that provide: • Electrical noise attenuation and voltage step-down from 480 volts to 120/208 volts • One or more 42-circuit branch panelboards • A power monitoring and control section PDUs can also be supplied with harmonic cancellation transformers for more complete power protection.

		STS PDUs STS (static transfer switch) PDUs accept two input sources, typically from separate UPS systems, and feed power out to branch panelboards or to remote power panels. In the event that one input source fails, these systems are designed to automatically transfer loads to the other input source via the internal static switch. STS PDUs are usually equipped with redundant input transformers as well.

		RPPs Remote Power Panels (RPPs) are common in large data center applications, where rows of equipment racks must be fed from UPS and PDU systems located in other areas of the facility. RPPs are similar to PDUs (have one or more panelboards and optional monitoring) but do not contain a transformer, which allows for a very compact footprint. RPPs can be installed directly into a row of equipment racks. Key features and benefits include: • Versatility: Simplifies adding new circuits and cable routing changes while maintaining neat wiring layout. • Centralized distribution: Minimize cable lengths by locating PDU close to loads. • Centralized monitoring: Comprehensive monitoring and alarm capability including remote communications, event logging, and software options. • Expandability: Add auxiliary cabinets as distribution requirements change. For more information, visit the MGE UPS Systems Website.