Asco 7000 Series Power Switching Solutions

ASCO 7000 Series Power Switching Solutions

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 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.

Fig. 2: Four pole, Closed-Transition Transfer Switch rated 1000 amperes in Type 1 enclosure.

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.

•Available 150 through 4000 amperes.

•Utilizes reliable, field proven solenoid operating mechanisms.

•Mechanical interlocks to prevent direct connection of both sources.

•Indicator light (16mm, industrial grade type LED) for load disconnect position.

•Adjustable time delay for load disconnect position.

Fig. 3: Four pole, Delayed-Transition

Transfer Switch rated 2000 amperes.

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7000 specifications

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