CyberPower PDU33103 Three-Phase Monitored PDU — 44-Outlet, 0U Rackmount, 120/208V 20A
Overview
The CyberPower PDU33103 is a zero-U three-phase monitored power distribution unit built for dense rack deployments where outlet count, visibility into power consumption, and centralized management matter. Rated at 20A with a NEMA L21-20P input plug and accepting nominal input voltages from 120V to 208V, this unit distributes across 44 NEMA 5-20R outlets — enough to cover a fully loaded 42U or 48U cabinet without daisy-chaining. The 0U form factor mounts vertically inside the rack, preserving every usable rack unit for active equipment. That combination of three-phase input, high outlet density, and in-band remote monitoring makes the PDU33103 the practical answer to power management in server rooms, network closets, and security operations infrastructure where you're running mixed loads across multiple circuits.
Key Features
- 44 × NEMA 5-20R Outlets: Running three-phase input through 44 outlets means you can populate an entire cabinet — compute nodes, storage, switches, and camera recorders — from a single PDU. No splitters, no piggyback strips that void rack warranties. Every outlet is individually monitored at the PDU level so you can see total load in real time via the front-panel LCD.
- Three-Phase Input, 120–208V / 20A (NEMA L21-20P): The L21-20P plug accepts both 120V single-phase and 208V three-phase service, giving you flexibility across data center environments that mix legacy single-phase panels and modern three-phase feeds. At 20A input, the PDU33103 sits within the budget of a standard 20A three-phase circuit without requiring a dedicated 30A feed or custom whips.
- 0U Vertical Rackmount: Zero rack units consumed means a fully loaded 42U cabinet stays 42U of usable compute. The metal housing mounts along the vertical channel of standard EIA-310 racks. In dense deployments where every unit is billing or storing footage, not losing 1–2U to a horizontal PDU tray is a legitimate operational benefit.
- Front-Panel LCD Display: Local visibility of load status without opening a browser session or SSH tunnel — useful during commissioning, troubleshooting, or any time your network management path is down. The LCD surfaces real-time power data at the rack without requiring a laptop.
- Dual RJ-45 Ethernet Ports: Two network ports allow the PDU33103 to sit in-line on a management network segment with no need for a separate switch port on the management VLAN — one port in, one port out. In environments where out-of-band management networks are physically separated from production traffic, this saves a switch port and simplifies cabling.
- SNMP v1/v3, SSH, HTTPS, SSL, LDAP(S), RADIUS: The full protocol stack here is designed for enterprise environments where a PDU isn't just a power strip — it's an authenticated, encrypted, auditable infrastructure node. SNMP v3 means encrypted traps and authenticated polling, not cleartext SNMP v1 only. SSH and HTTPS replace Telnet and HTTP for CLI and web UI access. LDAP(S) and RADIUS mean PDU logins integrate with your existing directory infrastructure — no local accounts to manage across 50 PDUs in a data hall.
- IPv4 and IPv6 Support: Both addressing families are supported natively, so the PDU33103 drops into dual-stack environments without needing NAT workarounds or separate management VLANs for legacy addressing. Relevant for federal and enterprise deployments that are actively migrating to IPv6.
- USB Port + Firmware Upgradeable via USB: Firmware updates deploy via the USB port without a network path to the device — critical in air-gapped or high-security environments where internet-connected update mechanisms violate policy. A single USB drive can service an entire row of PDUs sequentially.
- Windows Active Directory Integration: Management protocol support includes Windows AD, which means PDU access control participates in the same group policy and role-based access infrastructure as servers and network gear. Provisioning and deprovisioning a data center technician's PDU access happens in Active Directory, not on each individual unit.
- Syslog + SMTP Alerting: Events (overload, outlet state changes, threshold crossings) ship via Syslog to your SIEM or log aggregator and via SMTP to operator email. In a 24/7 NOC or security operations environment, that means power anomalies surface in the same alert queue as network and server events — not in a separate PDU management console nobody checks at 3am.
- 3-Meter (10-foot) Input Cord: The 3m cord reaches from a floor-mounted PDU to an overhead three-phase bus without extension cords or cord management headaches. In a two-post or four-post open-frame rack, 3m gives you enough slack to route cleanly through the vertical cable manager.
- Metal Housing, Black Finish: All-metal construction versus plastic chassis PDUs holds up to the physical handling of rack installation and cable management operations without flex or cracking around the outlet faces. Standard black finish blends with EIA-compliant rack environments without custom finishing.
Integration and Compatibility
The PDU33103 fits standard EIA-310 19-inch rack infrastructure in its 0U vertical orientation. The NEMA L21-20P input is the standard connector for three-phase 20A circuits on North American three-phase distribution, compatible with PDU whips from APC, Raritan, Server Technology, and most commercial PDU infrastructure. The dual RJ-45 ports integrate with any 10/100 management switch. SNMP MIB files are available from CyberPower for integration with network management platforms including SolarWinds, PRTG, Nagios, and similar NMS tools. The RADIUS and LDAP(S) support allows the PDU33103 to authenticate against Microsoft Active Directory, FreeRADIUS, or any RADIUS-compliant AAA server. For UPS and power infrastructure deployments, CyberPower's PowerPanel Business Edition software provides a unified management interface for CyberPower PDUs and UPS systems on the same platform. The 44-outlet NEMA 5-20R layout supports C13 and C15 IEC power cords via standard NEMA 5-20R to IEC adapters, commonly used with server and network video recorder power supplies. For large-scale rack deployments, the PDU33103 pairs naturally with managed PoE switches and structured cabling infrastructure in the same cabinet. See the full CyberPower power management line for UPS, single-phase PDUs, and switched PDU variants in the same family.
Frequently Asked Questions
Q: What input plug and amperage does the PDU33103 use?
A: The PDU33103 uses a NEMA L21-20P input plug rated at 20A, compatible with standard three-phase 20A circuits. The unit accepts nominal input voltages from 120V to 208V, making it suitable for both 120V and 208V three-phase service in North American data center environments.
Q: How many outlets does the PDU33103 have, and what outlet type?
A: The PDU33103 provides 44 NEMA 5-20R outlets. This outlet type accepts standard NEMA 5-20P plugs (as used on most 1U/2U server and networking equipment) and is backward-compatible with NEMA 5-15P plugs as well.
Q: What rack space does the PDU33103 occupy?
A: Zero rack units (0U). The PDU33103 is designed for vertical mounting inside the rack frame, leaving all usable rack units available for active equipment. It mounts in the vertical channel of standard EIA-310 19-inch racks.
Q: Does the PDU33103 support SNMP monitoring and enterprise authentication?
A: Yes. The PDU33103 supports SNMPv1 and SNMPv3 (encrypted, authenticated), SSH, HTTPS, SSL, LDAP(S), and RADIUS, plus Windows Active Directory integration. This allows the unit to participate in enterprise directory-based access control and report to SNMP-based network management systems.
Q: Can the PDU33103 firmware be updated without a network connection?
A: Yes. Firmware is upgradeable via the USB port, allowing updates in air-gapped or network-restricted environments using a USB drive. The unit also includes a USB port for this purpose.
Q: What network protocols does the PDU33103 support for management?
A: The PDU33103 supports IPv4, IPv6, HTTP, HTTPS, TLS, DNS, TCP/IP, DHCP, FTP, SNMPv1, SNMPv3, NTP, Telnet, SMTP, SSH, SSL, LDAP(S), RADIUS, UDP, Syslog, CLI, and Windows AD — a comprehensive stack for both legacy and modern enterprise management infrastructure.
The PDU33103 is the unit I'd specify for a dense cabinet build where you're running three-phase distribution and can't afford to lose rack space to a horizontal PDU tray. Forty-four NEMA 5-20R outlets on a single 0U vertical mount, with SNMPv3 and RADIUS authentication baked in — that's the difference between a PDU that's just a power strip and one that's a managed infrastructure node. I've seen installations where integrators spec a basic switched PDU and then spend hours managing local accounts on each unit; the LDAP(S) and Active Directory support on the PDU33103 sidesteps that entirely.
Technical Highlights:
- 44 × NEMA 5-20R Outlets, 0U: 44 outlets in zero rack units is genuinely useful in a full 42U cabinet — you can wire every 1U server, switch, and recorder without running out of outlets or daisy-chaining PDUs, which is an NEC code issue in commercial installations.
- SNMPv3 + LDAP(S) + RADIUS: SNMPv3 delivers encrypted, authenticated SNMP polling and traps — not the cleartext SNMPv1 that most basic PDUs ship with. Pair that with LDAP(S) or RADIUS and every PDU login is audited through your directory infrastructure, which satisfies most enterprise change-management and audit requirements without custom scripting.
- Dual RJ-45 + Full Protocol Stack: The two Ethernet ports support in-line management network topologies — one port connects upstream to the management switch, one port daisy-chains to the next device on the management segment. Combined with IPv6 support, NTP sync, and Syslog output, the PDU33103 fits into a modern dual-stack infrastructure without workarounds.
Deployment Considerations:
- The NEMA L21-20P input requires a three-phase 20A circuit with an L21-20R receptacle or a matching PDU whip from the busway — confirm your panel or busway provides this before ordering. Most legacy single-phase panels do not; this PDU is purpose-built for three-phase distribution infrastructure.
- At 20A input across three phases, derate to 80% per NEC continuous load rules — plan your connected load not to exceed roughly 16A sustained across the circuit. With 44 outlets, it's easy to underestimate aggregate draw if you're populating the cabinet without load tracking.
For a security operations data room or a colocation cage running NVR servers, PoE switch stacks, and network infrastructure in a single 42U–48U cabinet under three-phase power, the PDU33103 delivers the outlet density and enterprise management depth that basic PDUs can't match — without consuming a single rack unit.
