Russelectric launched its range of medium-voltage (5-15kV) Circuit Breaker-Type Transfer Switches and Bypass/Isolation Switches.

The switches are UL tested, listed, and labeled under UL 1008A, making them suitable for use in legally required emergency power systems.   
These switches transfer electrical loads between normal and emergency power sources through the carefully controlled opening and closing of circuit breakers and may be configured for open- or closed-transition transfer. 
All switch functions are controlled by Russelectric’s RPTCS programmable microprocessor-based control system. 
Designed for unattended operation, switches also include controls for manual operation and meet or exceed IEEE, NEMA, and ANSI standards.

For either the open- or closed-transition configuration, if the primary source is lost, the control initiates an open-transition transfer to the emergency source by tripping the primary source breaker and closing the emergency source breaker.  When open-transition retransfer is selected, the switch first verifies that the primary source has returned, opens the emergency source breaker, and then closes the primary source breaker.  When closed-transition retransfer is selected, the switch first performs a synch check to ensure that the primary source is in synchronism with the emergency source, then parallels the two sources by closing the primary source breaker, and finally opens the emergency source breaker.

Also announced from Russelectric, Medium-Voltage Circuit Breaker-Type Bypass/Isolation Switches provide all the functions of an automatic transfer switch plus the ability to bypass power from live source to load in the event the transfer switch becomes disabled.  In addition, they are designed to allow isolation and de-energization of the automatic transfer breakers for maintenance, testing, and repair.  
John Meuleman, director of sales and marketing at Russelectric, said: "The UL 1008 code has been modified to cover medium voltage applications. For a data center operator they now have a device available which complies with UL 1008A.”
More information on UL 1008A.