Description
Ensure uninterrupted power delivery and simplified UPS servicing with the Vertiv Liebert NMBHW81 Maintenance Bypass Cabinet, engineered specifically for the Vertiv Liebert Nfinity UPS systems. This hardwired 20kVA solution offers seamless “wrap around” protection, allowing maintenance or removal of the UPS without disrupting the load.
The NMBHW81 model includes a 125A output circuit breaker, manual bypass switch, and UPS input disconnect, delivering complete control and flexibility. With a compact wall-mountable design and compatibility with 120/120/208/240V output at 60 or 50Hz, this bypass switch is ideal for data centers, network closets, and other mission-critical environments.
Note: Isolation transformer not included.
| Feature | Details |
|---|---|
| Manufacturer | Vertiv |
| Brand Name | Liebert |
| Model Number | NMBHW81 |
| Product Type | Bypass Switch |
| Power Capacity | 20kVA |
| Current Rating | 125 Amps |
| Output Voltage | 120/120/208/240V |
| Frequency Supported | 50Hz / 60Hz |
| Bypass Features | Manual bypass switch, UPS input disconnect |
| Circuit Protection | 125A Output Circuit Breaker |
| Isolation Transformer | Not Included |
| Mounting Type | Wall-mountable |
| Shipping Weight | 52 lbs |
| Condition | New and Factory Fresh |
| Country of Origin | Mexico |
| Compatible With | Vertiv Liebert Nfinity UPS |
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
