The Zenith ZBTS Series of Bypass/Isolation automatic transfer switches (ATS) are built for business and industrial critical applications requiring the reliability and enhanced operation. The ZBTS Series uses the MX250 microprocessor control system, which includes features specified for use in business and industrial critical applications. It also provides an intuitive user interface, communications capability and self diagnostics.
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
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
Seismic certified to OSHPD using testing standard ICC-ES AC-156
ISO 9001 certified manufacturing plant
UL 3-cycle (unconditional) short circuit withstand & close ratings
OSHPD seismic qualifications
Ratings 100 to 4000 amperes
2, 3 or 4 poles
Open type, NEMA 1, 3R, 4, 4X and 12 enclosures
120 to 600 VAC, 50 or 60 Hz
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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