Dimensional parameters of smart PDUs for power systems

Smart PDUs are designed with slim, rack-mountable profiles, typically ranging from 54mm width for vertical units to standard 1U or 2U heights for horizontal units, allowing flexible integration into data center racks.

General Form Factors

Smart PD

Us are available in vertical (zero-U) and horizontal (1U/2U) configurations.

Vertical PD

Us are slim and mount alongside the rack frame, saving space for equipment, while horizontal PDUs occupy standard rack units and are installed across the width of the rack. Typical vertical PDU widths start from 54mm, enabling dual mounting on one side of the rack for single-side cabling orientation.

Horizontal PD

Us generally conform to 19-inch rack width standards, with heights of 1U (44. 45mm) or 2U (88. 9mm) depending on the model.

Depth and Mounting

Depth varies by manufacturer and model, but most vertical PDUs are designed to fit within the depth of standard server racks (600–1200mm).

Horizontal PD

Us are usually 200–400mm deep, allowing sufficient space for outlet access and cable management. Mounting options include rear and side brackets for vertical units and front-to-back mounting rails for horizontal units, ensuring compatibility with both shallow and deep racks.

Power Density and Phase Considerations

Smart PD

Us support single-phase and three-phase power, with high-density models capable of delivering up to 55kW per rack in three-phase configurations. Higher voltage operation reduces current, allowing smaller cables and more compact PDU designs, which directly influences dimensional planning. Some models include daisy-chain connectivity, enabling multiple PDUs to be networked while maintaining a compact footprint.

Additional Features Affecting Dimensions

Integrated features such as touchscreen displays, environmental sensors (temperature, humidity, smoke), and latching relays may slightly increase the depth or front panel profile of the PDU. Manufacturers like Legrand and nVent provide modular designs that allow customization of outlet configurations without significantly altering the overall PDU dimensions.

Summary

Vertical PD

Us (Zero-U): Width ~54mm, height matches rack height, depth 600–1200mm, dual mounting possible.

Horizontal PD

Us (1U/2U): Width 19 inches, height 44–89mm, depth 200–400mm. High-density three-phase PDUs: Can deliver up to 55kW, compact design reduces cable size and footprint. Additional features: Touchscreens, sensors, and latching relays may slightly increase depth or front panel profile.

These dimensional parameters ensure that smart PDUs can be efficiently integrated into modern data center racks while providing monitoring, control, and high-density power distribution capabilities.