Legrand Raritan iX Rack-PDU 0U with 18xC13 / 18xHDOT Cx, 3-phase 400V 32A, Input Metered RCM (PX4-1699-E7M28V2)

Three-phase Rack PDUs with RCM — the right choice for high-density data centers

In modern high-density data centers, single-phase power is often no longer sufficient. Three-phase rack PDUs like the Legrand Raritan iX Rack-PDU 0U (PX4-1699-E7M28V2) distribute the load evenly across three phases, enable higher total power with optimized load balancing, and significantly reduce cabling effort in the server cabinet. With a 22.2 kVA power capacity, 36 outlets (18x C13, 18x HDOT Cx) and integrated RCM residual current monitoring, the PX4-1699-E7M28V2 delivers maximum power density and operational safety in a single vertical 0U PDU. The IEC 60309 input (3P+N+PE) with a 3 m power cord allows direct connection to three-phase power supplies in the data center. Six overload protection breakers with 10 kAIC interrupting capacity reliably protect connected devices from overload and short circuit. The color matrix LCD display with auto-flip function shows voltage, current and real power per phase, per breaker or per outlet directly on the unit.

Why is RCM particularly important for three-phase PDUs?

In three-phase high-power PDUs with 32A and 22.2 kVA, the effects of insulation faults or leakage currents are especially severe. The RCM function of the Legrand Raritan PX4-1699-E7M28V2 continuously monitors all three phases for differential currents and alerts when defined thresholds are exceeded — long before a critical fault occurs. This enables preventive maintenance and protects both the IT infrastructure and personnel from electrical safety risks. Especially in colocation environments, financial data centers and mission-critical IT infrastructures, this feature is a decisive advantage over standard metered PDUs. RCM monitoring detects even slowly increasing leakage currents that can indicate aging insulation, moisture-related changes or damaged cables. Combined with billing-grade energy metering (Class 0.5), this provides a comprehensive picture of the electrical situation in the rack — from energy efficiency to system safety.

How does three-phase power distribution optimize data center efficiency?

Even load distribution across three phases is a central advantage of the Legrand Raritan PX4-1699-E7M28V2 over single-phase rack PDUs. By alternating the assignment of outlets to the individual phases (alternating branch), load spikes are minimized and available capacity is used optimally. In combination with billing-grade energy metering (Class 0.5) at the input and branch-circuit level, data center operators obtain a precise data basis for capacity planning, energy cost analysis and load management — and this centrally via PDU Linking for up to 8 linked PDUs simultaneously. Cascading up to 32 PDUs over a single Ethernet port enables scalable and IP-efficient management even in large data centers with hundreds of racks. All measurement data can be seamlessly integrated into existing DCIM platforms via Redfish API, SNMP v3, MODBUS-TCP and JSON-RPC. Environment sensors for temperature, humidity, airflow and differential pressure extend monitoring beyond power and support holistic infrastructure management in the data center. The maximum operating temperature of 60 °C at full load underscores the robustness of the PX4-1699-E7M28V2 even under thermally demanding conditions in densely populated server rooms. Automated provisioning via TFTP, DHCP and USB flash drives accelerates commissioning and reduces manual effort when installing new PDUs. Data logging via HTTP/S or MQTT enables complete documentation of all energy and RCM measurements for compliance evidence and energy audits. The iOS and Android app additionally provides mobile access to all measurements and alarms — for maximum operational flexibility. CE certification ensures conformity with European safety standards and facilitates deployment in different countries and regulatory environments within Europe.