MGE introduces transfer switch for demanding IT system power

COSTA MESA, Calif., Aug. 12, 2002 — MGE UPS Systems recently introduced a new static transfer switch that ensures continuous AC power to mission-critical data processing and distributed computing, telecommunications and other power-critical loads.

The Epsilon STS (Static Transfer Switch) provides rapid switching between two independent AC power sources for uninterrupted operation of electronic equipment, MGE said. State-of-the-art power distribution must be in place to ensure absolute power availability.

Large server farms and co-location facilities often have a number of autonomous and heterogeneous power sources, including transformers, engine generator sets, UPSs, etc.
The new switch improves power quality and availability by creating a dual power source architecture that provides five to six 9’s of reliability demanded by modern critical environments.

The switch’s digital controls also give the facility manager the flexibility to customize specific switching requirements to meet the exact tolerances of their application. The Epsilon STS is available in a number of versions capable of transferring loads from 20 to 500 rack-mounted PC servers.

It can be used in conjunction with a power distribution system, such as MGE’s Power Management Module, with 252 connections per module — enough capacity to supply up to 24 racks with 84 optimized 1U servers.

The Epsilon STS performs transfers in three to four milliseconds and uses a unique “break before make” technique to ensure that power sources are never in parallel during transfer. This function eliminates the risk of fault propagation between the two sources — a must for high-availability installations.

At the heart of the STS is a failsafe logic system featuring the latest generation Field Programmable Gate Array (FPGA) circuitry to assure reliable source transfers under all conditions. Isolated triple-redundant power supplies and an inherently safe operating architecture fortify this logic circuitry.

To facilitate a high-level of communications, the Epsilon STS supervisory and communication functions incorporate Jbus/Modbus serial communications and dry-contact communication cards with the ability to add two additional cards. This together with MGE’s Monitor Pac supervision software, that administers all MGE equipment on the network, allows immediate information and notification of system performance to be readily available to the system administrator or facility manager.

About MGE:

MGE UPS SYSTEMS is a global provider of power quality solutions designed to increase the availability and uptime of any mission-critical application or process. From desktop PCs to large Data Centers and telecommunication facilities to semiconductor manufacturing plants, MGE’s UPS product and service solutions are deployed around the globe.

To learn more about MGE’s power protection solutions, visit MGE’s Web site at: or call MGE at 800/523-0142.

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