On receiving a utility power failure signal, switchgear starts engine generator(s) and controls their synchronization and individual circuit breaker closure to parallel the generators onto the emergency bus. Additional controls allow 
transfer of loads to the emergency bus on a priority basis.

Upon return of the preferred source, utility paralleling switchgear synchronizes and parallels the engine generators to the preferred source, and transfers the loads without power interruption.  Generator test -- transferring load from source to source without power interruption -- is also available.  Use of the closed transition operation minimizes load interruptions during test and retransfer. 

All systems are UL listed
IEC listings available 
All systems are provided with selector switches for :
Open or closed transition
Automatic or manual paralleling  of generator or utility sources
Automatic or manual retransfer to normal source
Active synchronization
Redundant PLC controls
Soft loading power transfer
Utility-approved interconnecting protective relay design
SCADA capable
Touchscreen control available

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Power Control Systems.
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