Vertiv Rpdu Rack Transfer Switch Monitored Unit Level 30/32A 200-240V 7.3KW Horizo - VA4U31A0

Vertiv VA4U31A0 Monitored Rack Transfer Switch PDU, 30/32A, 200-240V, 7.3kW

Overview

The Vertiv VA4U31A0 is a 0U horizontal-mount rack transfer switch with integrated per-unit monitoring, purpose-built for high-availability data center and server room deployments where a single power path failure cannot be allowed to take down connected equipment. Rated at 30/32A on a 200–240V single-phase input and delivering up to 7.3kW of usable capacity, the VA4U31A0 gives infrastructure teams the ability to cut over between two independent power feeds automatically while maintaining continuous visibility into current, voltage, and power consumption at the unit level — all from a built-in LCD and over the network via SNMP.

Deployed horizontally in standard EIA-310 rack space, this unit fits into high-density cabinet environments without consuming valuable 1U or 2U front-facing rack positions. The Vertiv rack power distribution lineup is designed for exactly these edge cases: facilities that run dual power paths but need the transfer logic and monitoring intelligence managed inside the rack itself rather than at the UPS or upstream switchgear level.

Key Features

• 30/32A @ 200–240V Single-Phase Input: At up to 7.3kW of capacity, this unit handles the full load of a fully populated 1U–4U server or a mid-density blade chassis. The IEC 60309 input plug means you're connecting to a purpose-built industrial connector rated for repeated mate/demate cycles — not a fragile C19 that wobbles loose under vibration.
• Rack Transfer Switch Function: The core value here is automatic transfer between two power sources with no manual intervention. For colocation tenants or enterprise data centers with separate A/B power feeds, this eliminates the single-point-of-failure at the cabinet level without requiring dual-corded servers. One PDU handles the transfer logic for the entire rack string.
• Unit-Level Current, Voltage, and Power Monitoring: Monitoring at the unit inlet — not just per-outlet — means you get a true kW reading of total rack load in real time. This is the number that matters for capacity planning, PUE calculations, and alerting on overload conditions before a breaker trips. The built-in LCD puts that data locally accessible without a laptop or KVM.
• LCD Display: On-unit display means field technicians get immediate load readings during installation or troubleshooting without hunting for a laptop or waiting for SNMP poll cycles. Useful in noisy colocation environments where every physical trip to the cabinet costs time.
• SNMP v1/v2c/v3 + Full Protocol Stack: Support for SNMP v3 (encrypted, authenticated) alongside HTTP/HTTPS, SSH, LDAP, RADIUS, and TACACS+ means this unit integrates cleanly into enterprise security architectures with role-based access and audit logging. DHCP and IPv4/IPv6 dual-stack support handles both legacy and modern network environments without reconfiguration.
• Modbus TCP: Beyond SNMP, Modbus TCP support allows direct integration with building management systems (BMS) and DCIM platforms that speak industrial protocols — common in larger facilities running mixed IT/OT infrastructure. This is not a feature you'll find on every monitored PDU at this price tier.
• SSH + HTTPS Management Access: Encrypted management channels mean credentials and telemetry data are not traversing the network in plaintext. In environments subject to SOC 2, ISO 27001, or internal IT security policy, this matters at audit time.
• NTP, Syslog, SMTP Alerting: Time-synchronized event logging via NTP with Syslog forwarding to your SIEM and SMTP email alerts on threshold conditions. This is the alert triangle for power events — you don't want to find out about an overload condition from a helpdesk ticket after the fact.
• 3-Meter Input Cable: The 3m cord length gives enough reach from the cabinet to a floor PDU or overhead busway tap without extension chains. In most standard 600mm-deep open-frame or enclosed cabinet installations, this eliminates the need for custom cable runs.
• USB + Serial (RJ-45) Local Management Ports: The USB and serial console ports are your out-of-band fallback when network connectivity to the management card is lost. Every production deployment should have the serial console mapped to a console server — this unit supports that directly.

Integration and Compatibility

The VA4U31A0 supports the full range of enterprise rack PDU management protocols required for modern DCIM integration. SNMP v1/v2c/v3 MIB data feeds into platforms like Vertiv's own Trellis, Nlyte, or third-party DCIM tools. The Modbus TCP interface opens a direct path to Schneider EcoStruxure, Siemens Building Operator, or custom BMS integrations where IT and facilities share a single energy monitoring plane.

For security hardening, LDAP and RADIUS support enable centralized directory-based authentication, while TACACS+ provides command-level authorization logging — a requirement in many federal and financial sector environments. Syslog output integrates with Splunk, Graylog, or any syslog-compatible SIEM. Review your network infrastructure to ensure the management VLAN is available at the cabinet before installation, as a dedicated management network segment is recommended for PDU access in multi-tenant environments.

The IEC 60309 input connector is compatible with matching 200–240V industrial receptacles standard in purpose-built data center floor PDU and busway systems. Verify source circuit breaker rating matches the 30/32A load capacity before commissioning — undersized upstream protection will trip before this unit reaches rated load.

Frequently Asked Questions

Q: What is the maximum power capacity of the VA4U31A0?

A: The VA4U31A0 is rated at 30/32A on a 200–240V single-phase input, delivering up to 7.3kW of capacity. Actual usable capacity depends on your facility's upstream circuit rating and local electrical code — many jurisdictions require derating to 80% of breaker rating for continuous loads, which would put the practical ceiling at approximately 5.8kW on a 30A circuit.

Q: Does the VA4U31A0 support SNMP v3?

A: Yes. The VA4U31A0 supports SNMP v1, v2c, and v3. SNMP v3 includes authentication and encryption (AuthPriv mode), which satisfies most enterprise and compliance requirements for encrypted network management traffic.

Q: What input connector does the VA4U31A0 use?

A: The VA4U31A0 uses an IEC 60309 input plug on a 3-meter cable. IEC 60309 is a heavy-duty industrial connector rated for repeated connection cycles and commonly found on data center floor PDU systems and overhead busways in the 200–240V range.

Q: Can the VA4U31A0 integrate with a building management system (BMS)?

A: Yes. In addition to SNMP, the VA4U31A0 supports Modbus TCP, which is the standard protocol for BMS and DCIM platforms in facilities running mixed IT/OT infrastructure. This allows current, voltage, and power data to feed directly into platforms such as Schneider EcoStruxure or Siemens Building Operator alongside mechanical systems data.

Q: How is the VA4U31A0 mounted in a rack?

A: The VA4U31A0 is a 0U horizontal-mount unit designed for installation in standard EIA-310 rack enclosures. Horizontal mounting means it installs along the side rail or bottom of the rack without consuming front-facing rack unit positions — important in high-density environments where every rack unit has compute or storage value.

Q: Does the VA4U31A0 support IPv6?

A: Yes. The VA4U31A0 supports both IPv4 and IPv6 dual-stack networking, along with DHCP for address assignment. This ensures compatibility with modern network infrastructure and avoids the need for static IPv4 workarounds in environments that have transitioned to or are running parallel IPv6 addressing.

Karl Wilson

The feature I keep coming back to on the VA4U31A0 is the Modbus TCP support sitting alongside the SNMP v3 stack. Most monitored PDUs in this class give you SNMP and call it done — Modbus TCP is the differentiator that lets facilities teams pull the same 7.3kW unit-level power data into their BMS alongside HVAC and cooling without running a separate integration layer. That matters a lot in enterprise data centers where the facilities and IT teams both need power visibility but operate entirely different tool stacks.

Technical Highlights:

• 30/32A IEC 60309 Input: The industrial-grade connector matters on a transfer switch — this unit may cycle its source connection under load during a transfer event, and IEC 60309 is rated for exactly that kind of duty cycle. A C19 in the same scenario introduces connector wear risk over time.
• SNMP v3 + TACACS+: AuthPriv SNMP v3 plus TACACS+ command authorization means this unit can satisfy security audit requirements that plaintext SNMP v1/v2c management simply cannot. In federal, financial, or SOC 2 Type II environments, this combination is often the minimum bar for network-managed infrastructure.
• Unit-Level Monitoring (Current, Voltage, Power): The monitoring is at the input level, not per-outlet. For a transfer switch application this is the right instrumentation point — you want to know total rack load and which source is active, not per-outlet detail that belongs on a metered PDU downstream.

Deployment Considerations:

• The 3-meter input cable is generous for most standard-depth cabinets, but verify your floor PDU receptacle position before ordering — in overhead busway installations the 3m run may be tight depending on cabinet placement relative to the tap box.
• The unit monitors current, power, and voltage but the AC outlet quantity listed is 1 — this is a transfer switch unit, not a high-outlet-count distribution PDU. Pair it with downstream metered or switched PDUs if per-outlet switching or monitoring is needed for individual 1U servers.

The VA4U31A0 is the right specification for a colocation tenant or enterprise IT team running dual-feed A/B power into cabinets holding high-value, non-dual-corded servers — medical imaging workstations, GPU compute nodes, or legacy single-PSU storage arrays where downtime during a PDU source failure is unacceptable and re-cabling to dual-corded equipment is not on the roadmap.