All MGE UPSs designed for server protection can be integrated into any fault tolerant architecture with no additional hardware in one of the 3 following ways to avoid any critical single point of failure.

Fault Tolerant, Hot Swappable UPS

Should you use a server with redundant power supplies, simply size the UPS for use with one power supply and get our optional Hot Swap module (also called Maintenance By Pass). Connect both power supplies to the output of the UPS.

If one of the power supplies of the server fails, the second will take the lead and will still be protected by the UPS.

If the UPS fails, it will switch automatically to its fault tolerant circuit with no interruption to the server

Simply swap the UPS without interrupting the server by operating the external hot swap module

Suggested UPSs: US: Pulsar EX 15/20/30, Int'l: Pulsar EX 15/20/30/40

Cascade Redundant UPS

When protecting cluster rooms with multiple servers, each of them with N+1 redundant power supplies, the best solution is to get one central UPS, backed-up by another one of the same type. Simply connect the input of the first UPS to the output of the second one. Then connect all your devices to the first UPS. The second UPS will be fed by utility power.

Should the first UPS fail, it will switch automatically to its fault tolerant circuit and the second UPS will take on immediately without interrupting the cluster of servers.
The same scenario will take place should the second UPS fail.
The additional benefit of this solution is that your battery runtime will double! In case of an extended power failure, The second UPS will supply the first one from its batteries. When battery runtime will be exhausted on the second UPS, the first UPS will then switch to battery and provide continuous power to the protected equipment.
The slight limitation of this exciting solution is that the output power must be derated by about 15% to take into consideration the efficiency of the second UPS.
Suggested UPSs: US: Pulsar EXL 5/7.5/10, Int'l: Comet S11 5/7.5/10

With the new Multislot communication expander, you can add a MetaUPS card and view both UPSs as one single system on our network management system (or from UM Console)

N+1 Uninterrupted Power Sources

Should you need battery backed-up N+1 redundancy, simply connect one small UPS to each power supply of your server.

Whatever power supply is used, it will always be protected by one of the 3 UPSs.

Should one of the UPS fail, the server will switch automatically to another power source.

You can then stop the faulty UPS to replace it without any interruption to the server.

A nice benefit of this configuration is also a longer battery runtime as power is shared between power supplies. When using 3 UPSs, each of them will only be used at one third of their capacity, which will more than triple the battery runtime you would get with only one UPS!

Suggested UPSs: Pulsar ESV 8+/11+/14+

When you want to protect multiple servers having N+1 redundant power supplies, you can use the above mentioned UPS arrangement to form a Power Cluster. The combination of servers with N+1 redundant power supplies and the same number of UPS is the the solution that combines the highest availability with the best reliability. MGE's Pulsar Esprit has been specifically designed to optimize availability of Internet servers using a Power Cluster arrangement