Vertiv VP4N20A0 Monitored Vertical PDU — 20A, 120V, 24-Outlet, Unit-Level Metering
Overview
The Vertiv VP4N20A0 is a unit-level monitored, single-phase vertical rack PDU designed for high-density data center and server room deployments where per-unit power visibility matters. It delivers 20A at 100–120V (1.9 kW usable capacity) across 24 NEMA 5-20R receptacles in a vertical zero-U mounting profile — keeping horizontal rack space entirely free for revenue-generating equipment. The included 10-foot, NEMA 5-20P input cord gives enough reach to connect cleanly to a dedicated 20A circuit without extension hardware in most standard cabinet layouts.
This is a monitoring-grade PDU, not a simple strip. The VP4N20A0 measures current, voltage, power, and temperature at the unit level and reports that data via dual Ethernet (RJ-45) ports to your NMS or DCIM platform — no add-on hardware required. For environments running mixed loads or running close to circuit capacity, real-time power data is the difference between proactive capacity management and an unexpected trip.
Key Features
- 24 NEMA 5-20R Outlets on a Vertical, Zero-U Footprint: All 24 receptacles are NEMA 5-20R, accepting standard 5-20P plugs from servers, network switches, and KVM gear. The vertical mounting profile installs inside the rack's zero-U side channel, so no 1U or 2U of rack space is consumed — critical when you are paying per rack unit in a colo environment.
- Unit-Level Monitoring — Current, Voltage, Power, Temperature: The VP4N20A0 measures and reports four key environmental and electrical parameters per PDU. Knowing actual kilowatts drawn (not just amps) lets capacity planners calculate PUE contributions accurately and catch load imbalances before they become circuit-breaker events. Temperature monitoring at the PDU level adds a local thermal data point without a separate sensor purchase.
- Dual Ethernet (RJ-45) Ports for Daisy-Chaining: Two RJ-45 ports plus confirmed daisy-chain support mean you can connect multiple PDUs in a string through a single network port on your ToR switch, reducing cabling overhead in dense multi-PDU cabinets. Each PDU in the chain retains independent addressability for monitoring.
- Protocol Stack Built for Enterprise Integration: The VP4N20A0 speaks SNMP v1/v2c/v3, HTTPS, SSH, SMTP, Syslog, Modbus TCP, LDAP, RADIUS, TACACS+, and RSTP out of the box. SNMPv3 with authentication and encryption means this PDU can integrate directly into enterprise NMS platforms (SolarWinds, PRTG, Nagios, Vertiv's own Trellis) without compromising your network's security posture. LDAP and RADIUS/TACACS+ support lets you manage PDU credentials through your existing directory rather than maintaining a separate local user database.
- IPv4 and IPv6 Dual-Stack Networking: Native IPv6 support future-proofs integration in networks that have already begun the transition — no NAT workarounds or IPv4-only management VLANs required.
- LED Display and Reset Button: The on-unit LED display surfaces local status without requiring a laptop or network connection — useful during initial commissioning or hands-on troubleshooting in noisy data center environments. A hardware reset button is present for recovery without physical PDU replacement.
- USB Port for Local Management or Firmware: The single USB port supports local out-of-band management access or firmware updates in environments where network access to the PDU management interface is restricted during maintenance windows.
- 50/60 Hz Input Compatibility: The 100–120V, 50/60 Hz input range covers both North American 60 Hz power infrastructure and international facilities running 50 Hz, giving this PDU utility in globally distributed deployments where standardizing on a single PDU SKU reduces spare-parts complexity.
Integration and Compatibility
The VP4N20A0's protocol breadth — SNMP v1/v2c/v3, Modbus TCP, HTTP/HTTPS, Syslog — covers virtually every DCIM and NMS platform in active enterprise use. Modbus TCP integration is particularly valuable for facilities teams using building management systems (BMS) that expect Modbus rather than SNMP. The power distribution and UPS category includes compatible Vertiv UPS units and environmental sensors that pair naturally with this PDU in a monitored cabinet stack. For guidance on planning power capacity across a rack deployment, refer to the PDU selection resources in the power distribution section. The dual-NIC daisy-chain architecture integrates cleanly with managed PoE and data switches that support SNMP polling from a single upstream port per PDU string.
Vertiv's full Vertiv power infrastructure line includes higher-amperage and three-phase PDU variants for deployments that will outgrow a 20A single-phase circuit, as well as rack accessories and environmental monitoring sensors designed to complement this unit's temperature reporting.
Frequently Asked Questions
Q: What is the maximum load the VP4N20A0 can support?
A: The VP4N20A0 is rated for 20A at 100–120V, yielding a maximum of approximately 1.9 kW. Per standard electrical practice, sustained load should not exceed 80% of rated capacity (16A / ~1.5 kW) to stay within safe operating limits.
Q: Does the VP4N20A0 support per-outlet switching or outlet-level metering?
A: No. The VP4N20A0 is a unit-level monitored PDU — it measures current, voltage, power, and temperature at the PDU level, not per individual outlet. It does not support remote outlet switching. If per-outlet metering or switching is required, a higher-tier PDU model in the Vertiv line should be evaluated.
Q: Can I daisy-chain multiple VP4N20A0 units through a single network connection?
A: Yes. The VP4N20A0 includes two Ethernet (RJ-45) ports and supports daisy-chaining, allowing a string of PDUs to share a single upstream switch port while each unit retains its own network address and monitoring data stream.
Q: What network protocols does the VP4N20A0 support for DCIM and NMS integration?
A: The VP4N20A0 supports SNMP v1/v2c/v3, HTTPS, SSH, HTTP, SMTP, Syslog, Modbus TCP, LDAP, RADIUS, TACACS+, RSTP, NTP, DHCP, IPv4, and IPv6. SNMPv3 with encryption and LDAP/RADIUS/TACACS+ directory integration are available for enterprise security requirements.
Q: What outlet type does the VP4N20A0 use, and how many outlets are included?
A: The VP4N20A0 provides 24 NEMA 5-20R receptacles. The input plug is NEMA 5-20P on a 10-foot (3-meter) cord, connecting to a standard 20A/120V branch circuit.
Q: Does the VP4N20A0 include temperature monitoring without an external sensor?
A: Yes. Temperature monitoring is included as one of the four unit-level parameters measured (current, power, temperature, voltage). This provides a baseline thermal data point for the cabinet without requiring a separate add-on sensor.
The VP4N20A0 sits in a specific and well-defined niche: you need 24 outlets on a 20A circuit, you want unit-level power and temperature data piped to your NMS via SNMPv3, and you need all of that without burning a single rack unit. That combination — vertical zero-U form, 24 NEMA 5-20R outlets, and a full enterprise protocol stack — is exactly what this PDU is engineered to deliver.
Technical Highlights:
- Dual Ethernet + Daisy-Chain: Two RJ-45 ports with daisy-chain support reduce switch port consumption in multi-PDU cabinets. A four-PDU cabinet with daisy-chain uses one switch port rather than four — non-trivial at colo prices per port.
- SNMP v3 + TACACS+ + LDAP: This is the protocol trifecta for enterprise compliance. SNMPv3 gives encrypted polling; TACACS+ enables per-user command accounting; LDAP centralizes credential management. Most 20A strip-style PDUs don't offer all three.
- Unit-Level Temperature Monitoring: Built-in thermal sensing at 1.9 kW load densities matters — hot-aisle containment failures show up in PDU-level temperature data before they become equipment failures. No external sensor purchase required.
Deployment Considerations:
- This PDU draws from a single 20A branch circuit. In a dense deployment, verify your panel's phase loading before committing to a single-phase PDU string — the 1.9 kW (at 100% load) ceiling is real, and sustained draw should be planned at 80% (1.5 kW / 16A).
- Unit-level monitoring means you know total PDU load, not individual outlet load. If a specific server's power draw is the data point you need — for chargeback or capacity planning at the outlet level — this unit won't provide it; evaluate outlet-metered PDU options in the Vertiv line instead.
This PDU is the right fit for a colo or managed hosting cabinet build where you need enterprise-grade monitoring credentials (SNMPv3, LDAP, TACACS+), need all 24 NEMA 5-20R outlets to fill a standard server and networking stack, and have confirmed your power draw will stay under the 80% rule on a 20A circuit.
