Vertiv Rpdu Monitored Outlet Level EC 16A or 20A 120V or 208V or 230V 1.9KW or 3.3K - VP6U21A0

Vertiv VP6U21A0 Monitored Outlet-Level Rack PDU

Overview

The Vertiv VP6U21A0 is a 0U vertically-mounted, single-phase monitored rack PDU designed for data center and server room operators who need granular visibility into power consumption at the outlet level. With a C20 input coupler and a mix of C13 and C19 receptacles across 12 outlets, this unit handles both standard 1U server draws and higher-demand devices like blade chassis or UPS bypass loads — all from a single horizontally-mounted, zero-rack-unit footprint that frees your 1U and 2U slots for revenue-generating compute. The VP6U21A0 supports nominal input voltages from 100 to 240V at 50/60 Hz, covering North American 120V and 208V deployments as well as international 230V environments without hardware changes.

Key Features

• Outlet-Level Current, Voltage, and Power Monitoring: The VP6U21A0 measures current, voltage, and real power at each outlet independently — not just at the input breaker. That distinction matters when you're tracking per-server power draw for chargeback, capacity planning, or troubleshooting a tripped breaker without pulling everything off the rail.
• 12 Mixed C13/C19 Outlets: Having both C13 and C19 receptacles in the same PDU means you can service standard servers (C13, typically under 10A) and higher-draw equipment like KVM switches, high-density blade systems, or UPS inputs (C19, up to 16A or 20A) from the same rail — eliminating the need for a separate high-power PDU in mixed racks.
• C20 Input Plug (16A/20A): The C20 coupler connects directly to rack-mounted UPS output sockets or in-row power strips without an adapter. If your UPS already has C19/C20 whips, VP6U21A0 wires in cleanly; no pigtail adapters increasing cable management complexity.
• 0U Vertical Mounting: Zero rack units consumed. The unit mounts vertically in the side channel of a standard open-frame or enclosed rack, preserving every U of front-panel space for equipment. That's a concrete difference on fully loaded 42U racks where 1U PDUs eat into sellable compute density.
• LED Display: An integrated LED indicator provides at-a-glance status locally — useful during physical commissioning or triage without requiring a laptop or network connection to the management interface.
• Dual-Stack IPv4/IPv6 Networking (RJ-45): The single Ethernet port supports both IPv4 and IPv6 natively. In environments transitioning to IPv6 or running dual-stack DC infrastructure, there's no need for a separate management VLAN workaround or firmware update to enable v6 addressing.
• SNMP v1/v2c/v3 + Modbus TCP: SNMP v3 delivers encrypted, authenticated trap delivery to your NMS (Nagios, PRTG, SolarWinds, etc.) without relying on community-string security. Modbus TCP support is the differentiator for BMS/DCIM integrations — Schneider EcoStruxure, Vertiv Trellis, or custom SCADA platforms can poll outlet-level data natively over the same network connection.
• Enterprise AAA: RADIUS, LDAP, TACACS+: Authentication offloads to your existing directory or TACACS+ infrastructure, meaning PDU access follows the same provisioning and deprovisioning workflow as your switches and servers. No local account sprawl across 40 PDUs per row.
• SSH + HTTPS Management: Both the CLI (SSH) and web interface (HTTPS) are encrypted. HTTP and Telnet are available for legacy integrations, but default to the encrypted transports for any PCI-DSS or SOC 2 audited environment.
• NTP Time Sync: NTP synchronization keeps outlet-level event logs and SNMP trap timestamps aligned with your SIEM or syslog aggregator — critical when you're correlating a power anomaly with a server fault event across systems.
• 3-Meter Input Cable: The 3m (approximately 9.8 ft) power cord provides enough reach from floor-mounted UPS to top-of-rack PDU mounting position in a standard 42U cabinet without cable management extensions.

Integration & Compatibility

The VP6U21A0 speaks the protocols that matter in managed DC environments. SNMP v3 MIBs integrate with any RFC-compliant NMS. Modbus TCP enables native polling by DCIM platforms without a protocol gateway. SMTP delivers email alerts on threshold breaches directly — no relay agent required if your DC has outbound SMTP access. Syslog forwarding feeds outlet events into Splunk, Graylog, or any centralized log management platform. The unit's dual USB and serial ports provide out-of-band console access and secondary management paths when the network is unreachable, a requirement for Tier III and above data center operational standards. DHCP support simplifies initial provisioning in dynamic addressing environments, while static IPv4/IPv6 assignment is the standard for production PDU infrastructure.

Frequently Asked Questions

Q: What input voltage does the VP6U21A0 support?

A: The VP6U21A0 supports a nominal input voltage range of 100–240V at 50/60 Hz, covering 120V and 208V North American deployments as well as 230V international environments from the same hardware SKU.

Q: Does the VP6U21A0 support SNMP v3?

A: Yes. The VP6U21A0 supports SNMP v1, v2c, and v3. SNMP v3 provides encrypted and authenticated trap delivery, which is the appropriate transport for any managed network environment with security policies restricting community-string-based SNMP.

Q: What is the outlet configuration on the VP6U21A0?

A: The VP6U21A0 provides 12 AC outlets in a mix of C13 and C19 coupler types, fed by a C20 input coupler. This supports both standard server loads (C13) and higher-draw equipment (C19) from a single PDU.

Q: Does the VP6U21A0 support Modbus TCP for DCIM integration?

A: Yes. Modbus TCP is listed among the supported network protocols, enabling direct integration with DCIM platforms, BMS systems, and SCADA environments that use Modbus as their polling protocol.

Q: How does the VP6U21A0 mount in a rack?

A: The VP6U21A0 is a 0U unit designed for vertical mounting in the side channel of a standard rack. It does not consume any rack unit space in the front or rear equipment panels.

Q: What authentication protocols does the VP6U21A0 support for management access?

A: The VP6U21A0 supports RADIUS, LDAP, and TACACS+ for centralized authentication, allowing PDU access management to integrate with existing enterprise directory and AAA infrastructure.

James Everett

The VP6U21A0 is one of the few PDUs in Vertiv's monitored line that combines outlet-level visibility across all three power parameters — current, voltage, and real power — with a protocol stack (SNMP v3, Modbus TCP, TACACS+) that satisfies the integration requirements of a properly managed Tier II or Tier III facility. If you're running 12 or more PDUs per row and relying on breaker-level monitoring only, you're flying blind on per-device draw, which makes capacity planning a guessing exercise.

Technical Highlights:

• 100–240V Universal Input: The same VP6U21A0 SKU works in 120V, 208V, and 230V environments — relevant for operators running mixed-voltage rows or multi-site deployments where procurement standardization reduces spare-parts complexity.
• SNMP v3 + Modbus TCP: SNMP v3 secures NMS trap paths; Modbus TCP opens the unit to DCIM and BMS platforms that don't speak SNMP natively. Having both on a single Ethernet port avoids protocol gateway hardware between the PDU and your monitoring stack.
• 12 C13/C19 Outlets via C20 Input: The C20 input coupler connects directly to UPS C19 whip outputs without adapters. Mixed C13/C19 receptacles mean one PDU handles both 1U servers and blade chassis without a secondary high-density PDU in the same rack.

Deployment Considerations:

• TACACS+, RADIUS, and LDAP support means initial provisioning should route through your AAA infrastructure from day one — don't configure local accounts as a shortcut and expect to remediate 40 PDUs per row later during a security audit.
• The 3m input cable is sized for a standard floor-to-top-of-rack UPS whip run; verify your UPS output socket position before ordering if your cabinet depth or UPS placement is non-standard.

This unit is well-matched for colocation operators and enterprise IT teams deploying mixed-density racks where per-tenant or per-server power accountability is a billing or SLA requirement — the outlet-level metering on the VP6U21A0 provides the data granularity those use cases require.