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In business and industrial critical applications power cannot be interrupted to perform maintenance of automatic transfer switches. In such circumstances, a bypass-isolation switch is essential and is often required by code.
Zenith ZBTS Series Bypass-Isolation Transfer Switches
are the solution when interruption of power during service or testing is not acceptable.
Consisting of two major modules-the Automatic Transfer (ATS) and the Bypass-Isolation Switch-the ZBTS Series incorporates the rugged construction of all our ZTS Series automatic switches with a quick
make/quick break bypass switch manual load transfer handle and our control/interlock system, which consists of both mechanical and electrical interlocks.
The bypass uses normal failure sensing and a time delay to start the engine automatically if a failure occurs when the ATS has been removed for service-which can be done without disturbing the load.
ZBTS - Standard (Open) Transition Bypass/Isolation
The Zenith ZBTS Bypass/Isolation transfer switch is used in general and mixed load applications.
ZBTSD - Delayed Transition Bypass/Isolation
The Zenith ZBTSD Bypass/Isolation transfer switch is used to transfer of large motor loads, transformers, uninterruptible power supplies (UPS) systems or load shedding to a neutral "center" position.
ZBTSCT - Closed Transition Bypass/Isolation
The Zenith ZBTSCT Bypass/Isolation transfer switch is used to transfer critical loads where a "no break" transfer is desired with this switch 100msec parallel capability.
Load is not interrupted during bypass & isolation operation High close-in and withstand capacity Automatic 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 automatic transfer switch Bypass to any available source with ATSremoved 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
Temperature rise test per UL 1008 conducted after overload and endurance tests in unventilated enclosure-exceeds UL requirements
UL 1008 listed at 480 VAC
CSA C22.2 No. 178 certified at 600 VAC
IEC 947-6-1 listed at 480 VAC
Seismic certified to IEEE-693-2005 at HIGH level with 2.5 amplification factor
Seismic certified to IBC-2006 at Ip=1.5 for z/h less than or equal to 1
Ratings 100 to 4000 amperes 2, 3 or 4 poles Open type, NEMA 1, 3R, 4, 4X and 12 Bypass and automatic transfer switch have identical ratings Suitable for emergency and standby applications on all classes of load, 100% tungsten rated through 400 amps
Available in ZBTS (utility-generator), ZBTSU (utility-utility), ZBTSG (generator-generator) and ZBTSM (manual) configurations
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