Description
The Vertiv VA4N21A0 Rack Transfer Switch (RTS) ensures continuous power for single-corded devices by automatically switching between power sources within 4-8 milliseconds. Designed with advanced power monitoring and network connectivity features, this horizontal rackmount unit delivers high availability, energy visibility, and simplified infrastructure management. Ideal for data centers and edge environments, it supports environmental monitoring and daisy-chaining of up to 50 devices over a single IP address.
| Feature | Specification |
|---|---|
| Part Number | VA4N21A0 |
| Product Type | Rack Transfer Switch (RTS) |
| Monitoring | Monitored Unit Level (kWh, W, VA, PF, V, A) |
| Power Switching | Automatic, <4–8ms transfer time |
| Voltage | 100–120V |
| Current Rating | 20A |
| Load Capacity | 1.9kW |
| Frequency | 50/60Hz |
| Input Power Connections | (2) NEMA 5-20P |
| Outlet Configuration | (10) NEMA 5-20R |
| Mounting | 19" Horizontal Rackmount (Adjustable 4-post 24"–37") |
| Display | Local high visibility LED overlay + touchscreen |
| Connectivity | Dual 10/100/1000 Mbps Ethernet, RS232 (RJ45) |
| Protocols | SNMP, HTTPS, SSH, Modbus TCP, JSON API, etc. |
| Daisy-Chaining | Up to 50 devices on one IP with RSTP support |
| Environmental Monitoring | Via RJ sensors (up to 16 sensors) |
| Cable Length | 10 ft / 3 m |
| Chassis Color | Black Powder Coat |
| Dimensions (HxWxD) | 1.72 x 17 x 18 in / 44 x 432 x 457 mm |
| Weight | 17 lbs / 7.71 kg |
| Certifications | UL & c-UL 62368-1, RoHS, FCC Part 15 Class A |
| Warranty | 5-year (with registration), 3-year standard |
Payment & Security
Your payment information is processed securely, and we do not store credit card details or access your credit card information.
Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
A decade of delivery — trusted by 275+ clients across industries
