ASCO 7000 Series Transfer Switches - Switch Types
|Closed Transition Transfer Switching|
ASCO Automatic Closed-Transition Transfer Switches feature main contacts
that overlap, permitting the transfer of electrical loads without power
interruption. The switch transfers in a make-before-break mode if both
sources are within acceptable parameters. Control logic continuously
monitors source conditions and automatically determines whether the load
transfer should be open (conventional non-overlap mode) or closed
transition. Available 150 through 4000 amperes.
Closed-Transition Transfer within 5 electrical degrees is achieved passively, without control of the engine generator set. Therefore, no additional control wire runs are required between the ATS and engine generator set governor. Plus, protective relaying may not be required under normal operation since the contact overlap time is less than 100 milliseconds (consult your local utility on protective relay requirements).
Failure to synchronize indication and extended parallel time protection is built-in to all 7000 Series closed transition controls to prevent abnormal operation.
|Delayed Transition Transfer Switching|
ASCO Delayed Transition Transfer Switches are designed to provide transfer of loads between power sources with a timed load disconnect position for an adjustable period of time. Applications include older style variable frequency drives, rectifier banks, and load management applications.
|Non-Automatic Transfer Switching|
ASCO Non-Automatic Transfer Switches are electrically operated units which
are operated with manual control switches mounted locally or at remote
|Automatic Transfer Bypass-Isolation Switching|
ASCO Automatic Transfer & Bypass-Isolation Switches are available in open transition, closed transition and delayed transition designs. The bypass and isolation features allow power transfer switches to be inspected, tested, and maintained without any interruption of power to the load.
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