Vertiv VP4N20A2 Vertical Monitored 3-Phase PDU, 20A, 120/208V WYE
Overview
The Vertiv VP4N20A2 is a vertical, rack-mount monitored PDU designed for high-density data center and server room environments where per-outlet visibility and three-phase power distribution are non-negotiable. Rated at 20A on a 120/208V WYE input — delivering up to 5.7kW — this unit provisions 42 AC outlets, 36 of which feature locking retention to prevent accidental disconnection under load. If you're running dense blade chassis, network gear, or mixed compute stacks in a two-post or four-post rack, the VP4N20A2 is built for that environment. For a broader look at the Vertiv power distribution lineup, the full catalog spans from basic rack PDUs to intelligent switched models.
Key Features
- Three-Phase 20A Input at 120/208V WYE: Three-phase distribution means load is spread across phases rather than stacked on a single leg — critical for keeping your rack power balanced and avoiding nuisance breaker trips in high-density deployments. At 5.7kW, this covers a fully loaded standard 42U rack in most mixed-compute scenarios.
- 42 AC Outlets, 36 Locking: The locking outlets mechanically retain power cords, eliminating accidental pull-outs — a genuine operational risk in active data centers during cable management work. Six standard (non-locking) outlets give you flexibility for temporary connections or equipment with non-locking plugs.
- Unit-Level Monitoring — Current, Power, Temperature, Voltage: The VP4N20A2 provides real-time metering at the unit level across all four critical parameters. This isn't just a check-box feature: voltage sag events and phase imbalance show up in the data before they become outages. Temperature monitoring at the PDU catches hotspot conditions in-rack without a separate sensor purchase.
- Dual Ethernet (RJ-45) Ports: Two network ports support daisy-chaining or network redundancy configurations, reducing IP address overhead in large deployments and giving you a failover path for management connectivity.
- Daisy-Chain Support: Chain multiple PDUs together under a single IP — reduces management overhead in high-density rows and simplifies SNMP polling trees. Critical for deployments where rack counts exceed available management IP ranges.
- Enterprise Protocol Stack: SNMP v1/v2c/v3, HTTPS, SSH, LDAP, RADIUS, TACACS+, Modbus TCP, Syslog, and NTP are all supported natively. This means the VP4N20A2 plugs directly into enterprise authentication infrastructure (LDAP/RADIUS/TACACS+) and monitoring stacks (SNMP/Syslog) without middleware or protocol converters. Modbus TCP extends integration to BMS and DCIM platforms that don't speak SNMP.
- LED Display: Local LED readout lets technicians verify load and status without remote access — important during commissioning and during network outages when management connectivity is down.
- USB Port: The single USB port supports firmware updates and local configuration — no network dependency for maintenance tasks.
- Reset Button: Hardware reset restores the management controller without affecting outlet power state — keeps compute running while resolving network or firmware issues on the PDU itself.
- 3-Meter Input Cable: The 3m (approximately 10 ft) input cable provides enough reach to connect to floor-mounted power whips or overhead busway without extensions in standard rack row configurations.
- Over-Current Protection: Built-in over-current protection limits fault propagation — a circuit-level event on one branch doesn't cascade to the full rack.
- IPv4 and IPv6 Support: Dual-stack networking ensures the VP4N20A2 integrates into both legacy and modern network architectures without reconfiguration as environments migrate to IPv6.
Integration and Compatibility
The VP4N20A2 fits within rack power distribution architectures managed via DCIM platforms, BMS systems, or SNMP-based NMS tools. Its Modbus TCP support is specifically relevant for facilities teams running BMS platforms that don't support SNMP natively — this PDU speaks both. SNMP v3 with LDAP/RADIUS/TACACS+ authentication satisfies most enterprise security policies without custom scripting. For environments standardizing on RSTP for network resilience, the dual Ethernet ports and RSTP protocol support allow integration into redundant management networks. Pair with a compatible UPS upstream to complete the power protection chain, and consult a PDU selection guide if you're sizing across multiple rack rows. The vertical form factor and daisy-chain capability make this PDU a natural fit for high-density data center switching and compute racks where horizontal space is scarce but outlet count is high.
Frequently Asked Questions
Q: What is the maximum current rating and input configuration for the VP4N20A2?
A: The VP4N20A2 is rated at 20A maximum current on a 100-120/200-240V WYE input (three-phase), operating at 50 or 60 Hz. At 208V WYE it delivers up to 5.7kW of capacity.
Q: How many outlets does the VP4N20A2 have, and are they all locking?
A: The VP4N20A2 has 42 AC outlets total. 36 of those are locking outlets that mechanically retain power cords to prevent accidental disconnection. The remaining 6 are standard non-locking outlets.
Q: What monitoring parameters does the VP4N20A2 track?
A: The VP4N20A2 monitors current, power, temperature, and voltage at the unit level. Data is accessible via SNMP (v1/v2c/v3), HTTPS, SSH, and Syslog, among other supported protocols.
Q: Does the VP4N20A2 support daisy-chaining multiple PDUs?
A: Yes. The VP4N20A2 supports daisy-chaining via its dual Ethernet (RJ-45) ports, allowing multiple units to be managed under a single IP address — reducing management overhead in multi-rack deployments.
Q: What network protocols does the VP4N20A2 support for enterprise integration?
A: Supported protocols include SNMP (v1/v2c/v3), HTTP, HTTPS, SSH, LDAP, RADIUS, TACACS+, DHCP, NTP, SMTP, Syslog, IPv4, IPv6, RSTP, and Modbus TCP. This covers both IT-standard SNMP-based monitoring and OT/BMS environments using Modbus TCP.
Q: Can the VP4N20A2 be mounted vertically in a standard rack?
A: Yes. The VP4N20A2 is designed for vertical rack mounting, which is the standard orientation for high-outlet-count PDUs in 42U two-post and four-post racks where horizontal rack space is at a premium.
The VP4N20A2 is the PDU I'd spec for a mid-density enterprise rack row where you need more than basic metering but aren't ready to pay for per-outlet switching. The 36 locking outlets are the detail that matters operationally — in a live data center, an accidental cord pull during maintenance is a real incident, not a theoretical one. Unit-level monitoring across current, power, voltage, and temperature gives the facilities and IT teams enough data to catch phase imbalance and thermal events before they cascade.
Technical Highlights:
- Three-Phase 20A / 5.7kW Capacity: Spreading load across three phases at 208V WYE keeps individual phase utilization manageable in dense racks — far more headroom than a single-phase 20A circuit at the same amperage rating.
- 14-Protocol Management Stack: SNMP v3 with LDAP, RADIUS, and TACACS+ authentication means this PDU integrates into enterprise AAA infrastructure directly — no local account sprawl, no separate credential management for PDU access.
- Modbus TCP Support: Most monitored PDUs stop at SNMP. Modbus TCP extends integration to BMS and DCIM platforms in facilities that run parallel OT and IT management systems — relevant in co-location and campus data center environments.
Deployment Considerations:
- The 3-meter input cable works for standard rack-to-busway or rack-to-whip distances; measure your floor-to-connection distance before ordering if your power infrastructure is overhead or unusually positioned.
- Unit-level monitoring means you get aggregate data per PDU, not per-outlet load readings — if per-outlet metering or remote outlet switching is a requirement, evaluate higher-tier models in the Vertiv Geist line before committing.
The VP4N20A2 is a strong fit for enterprise co-location deployments and on-premises data center rows where the priority is reliable three-phase distribution, outlet retention under active management, and deep protocol integration with existing SNMP and BMS infrastructure — without the cost overhead of full outlet-switching intelligence.
