Power distribution unit Rittal 7979.337 Switched three-phase PDU 30 AC outlets (C13/C19) 3 m cable 400 V 32 A

The Rittal 7979.337 is a switched three-phase power distribution unit (PDU) designed for high-density rack installations. It provides 30 AC outlets in a mix of C13 and C19 couplers, a 3 m supply cable and supports operation at nominal 400 V with a maximum current rating of 32 A and a maximum power handling up to 22,000 W. The unit is intended for vertical 0U mounting in IT racks and includes measurement capabilities for current and voltage per phase, network connectivity for remote monitoring and configurable switching behaviour.

Advantages

This switched PDU offers individual outlet switching and per-phase measurement, enabling precise monitoring and control of connected equipment. Network protocol support (including HTTP/HTTPS, SNMP, Modbus/TCP and OPC-UA) and firmware upgrade via USB facilitate integration into existing infrastructure and centralised management. The PDU features programmable startup and switching logic, adjustable alarm limits and an internal real-time clock with battery buffering for timed operations and logging.

Suitable for

• Data centre racks and server cabinets where vertical 0U mounting is required
• Environments needing remote power monitoring and control via SNMP, Modbus/TCP, OPC-UA or web interfaces
• High-density setups with a mix of C13 and C19 powered devices
• Applications requiring per-phase measurement and configurable alarm thresholds

When it may not be suitable

This PDU is designed for three-phase 400 V systems with a maximum current of 32 A; it is not suitable for single-phase installations or systems with lower/higher nominal voltages unless compatible upstream distribution is provided. It is intended for rack-mount use (vertical 0U) and may not be appropriate for free-standing or non-rack applications where different mounting or form factor is required.

Key specifications

• Input nominal voltage: 400 V
• Maximum current: 32 A
• Maximum power handling: up to 22,000 W
• AC outlets: 30 (combination of C13 and C19 couplers)
• Cable length: 3 m
• PDU type: Switched (individual outlet switching)
• Measurement: per-phase current and voltage monitoring; energy measurement accuracy ±1% (kWh) to EN 62053-21
• Mounting: vertical 0U rack mounting (tool-free options for compatible racks)
• Product colour: Black
• Weight: 7.18 kg

How to use

Install the PDU vertically in the rack’s zero-U space according to the rack manufacturer’s instructions. Connect the 3 m supply cable to an appropriate three-phase 400 V, 32 A supply. Configure network settings and choose protocols (HTTP/HTTPS, SNMP, Modbus/TCP, OPC-UA) to enable remote monitoring and control. Use the unit’s configuration options to set programmable startup behaviour, switching schedules or logic, alarm thresholds for voltage/current/output, and to enable operating hours or energy counting. Firmware updates are performed via USB when required.

What to consider before purchase

• Ensure facility electrical supply is three-phase 400 V capable and can deliver up to 32 A for the PDU
• Verify rack compatibility for vertical 0U mounting and available zero-U space
• Confirm the mix of C13 and C19 outlets matches the plug types of your connected equipment
• Plan network integration and management protocol compatibility with existing monitoring systems

Usage recommendations

For reliable operation, distribute loads evenly across phases, set appropriate alarm thresholds for current and voltage, and use the programmable startup and switching functions to coordinate power-up sequences. Regularly review energy and operating-hour reports and apply firmware updates via USB when available to maintain feature and security updates.