The ZBTSCT Closed Transition Transfer Switch is designed 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 ZTSCT 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.
