GE Industrial Solutions ZBTSCTH SERIES 100 - 4000 AMPS - Manual (Page 2)

INTRODUCTION
Zenith Bypass-Isolation Closed Transition Transfer Switches provide
Zenith’s most comprehensive load power protection during standard
operation, maintenance and testing procedures.
Closed Transition Transfer Switches parallel two available sources of
power during test procedures to enable transfer without interrupting power
to the load (make-before-break). Paralleling of the two sources occurs
within a predefined window of synchronization and the initial source is then
disconnected. If the primary source falls below preset voltage limits and the
second source is available, the transfer switch defaults to open transition
(break-before-make) mode. In this mode, the transfer switch uses the
power from the available source to open the switch from the “dead source”
first, before closing the switch into the second source. When in the Bypass-
Isolation mode, the switch acts as a manual transfer switch, enabling
testing, repair and even removal of the automatic transfer switch.
All Zenith transfer switches are designed for use on emergency or
standby systems, and are rated for total system or motor loads.
Transfer switches are UL Listed under Standard 1008 and CSA
Certified under Standard C22.2 No. 178.
This manual provides information on the installation, operation, and
maintenance of the switch. In addition, a complete information package is
supplied with each transfer switch which details the features and
accessories provided on that switch. The information package and the
instruction manual should be kept in a readily accessible location to
provide complete reference information on this critically important piece of
equipment.