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Other Range of Closed Transition Transfer Switches ZTSCT
The ZBTSCT Closed Transition Transfer Switch may be outfitted with a bypass-isolation switch for the utmost in reliability and versatility. The ZBTSCT Series provides the ability to withdraw the transfer switch unit for maintenance or inspection.
Using the proven switching technology of the ZTS/ZTSD Series of transfer switches, combined with controls developed during GE Zenith Controls years of experience, the ZBTSCT Series allows an overlap of normal and alternate sources of less than 100 milliseconds.
When conditions are sensitive to generator voltage drop or frequency dips, GE Zenith Controls can provide a variation of the closed transition method of transfer that combines the attributes of a ZTSCT with generator paralleling switchgear. This method of transfer requires greater coordination with the utility company and, typically, more sophisticated relay protection schemes. We suggest you specify option SL on your ZBTSCT (SL) unit and consult your GE Zenith Controls representative early in the project cycle to ensure proper application.
Electrical Ratings
- Ratings 100 to 4000 amperes
- 2, 3 or 4 poles
- Open type, NEMA 1, 3R, 4, 4X and 12
- Available in ZTSCT (transfer switch) or ZBTSCT (transfer/bypass switch) styles
- Suitable for emergency and standby applications on all classes of load, 100% tungsten rated through 400 amps
- UL 1008 listed at 480 VAC
- CSA certified at 600 VAC
- IEC listed 480 VAC
Performance Features
- Incorporates the applicable features of the ZTS and ZBTS Series
- Source parallel time of less than 100 milliseconds
- Closed transition operation (no power interruption) during transfer and retransfer when sources are within specified parameters
- Open transition transfer operation is initiated upon a source failure
- Available in ZTSCT (utility-generator), ZTSCTU (utility-utility) and ZTSCTM (manual) configurations
Design and Construction Features
- Transfer switch is located on a draw-out mechanism to facilitate maintenance
- Emergency power systems can be electrically tested without disturbing the load
- Power cables do not have to be disconnected to remove ATS
- Bypass to any available source with ATS removed
- Engine start circuit maintained during bypass operation; normal power failure causes engine start contact closure even with the ATS removed
- Diagnostic lights and detailed instructions for simple step-by-step operation
- Mechanical and electrical interlocks ensure proper sequence of operation
- Bypass switch contacts are closed only during the bypass-isolation operation
- Silverplated copper bus interconnection of the transfer and bypass switches on all sizes
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