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Transfer Switch Solutions

 

 

 

 

 

 

 

 

 

 

Why is a Transfer Switch Needed?

When AC power fails, you rely on batteries to keep your system running.  Unfortunately, batteries have limited capacity.  Operation through extended outages demands a redundant source of AC power.

Per National Electric Code and utility requirements, connecting that redundant power source means installing a transfer switch to prevent dangerous backfeeding into the dead utility line.

Why Cutler-Hammer?

Eaton’s Cutler-Hammer business is a world leader in transfer switch design using technology gleaned from our renowned circuit breaker family.  This experience provides a family of transfer switches featuring the industry’s highest interrupting and short-time ratings.  Our complete offering includes manual and automatic transfer switches with open, closed and soft-load switching.

We even reduce your cost by including required overcurrent protection in the transfer switch, not as an add-on component required by competitive solutions.

Options Available

For your lowest installed cost, specify open transition switching.  Specify closed transition switching for those applications where you can’t tolerate extended HID lighting outages caused by open transition switching of sources.  Specify soft-load transition to provide truly bumpless switching between redundant sources.

Bumpless Soft-Load Transfer

Why is true bumpless switching needed?  You know that any power disturbance lasting more than 150 milliseconds depletes battery capacitive storage and causes your batteries to begin to discharge electrochemically.  Each electrochemical discharge and recharge cycle reduces the capacity of a battery.  With modern VRLA batteries limited to 400 charge/discharge cycles under best-case conditions, reducing intentional switching disturbances pays off quickly with increased battery life.  In fact, battery systems protected by a soft-load transfer switch can last two to three times longer than batteries protected by ordinary open or closed transition switches.

With labor and materials estimated at $4000 to replace a 4-string 48 volt DC supply, not including the hazardous material disposal costs, double or triple battery life means that your battery replacement charge is dramatically reduced. So a battery string that was replaced every 3 years can now be replaced no sooner than every 6 years, putting in excess of $4000 back in your pocket. Larger battery systems save even more!  


Solutions

Transfer Switches
Complete selection of open, closed, soft-load and peaking transfer switches.
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Extend Battery Life
Soft-Load transfer switches extend battery life.
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Monitor Battery Life
Low cost method of monitoring batteries through existing SCADA network.
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Balance Battery Charging
New technique for extending battery life.
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