- ZTSCT, ZBTS, ZBTSD & ZBTSCT
Series Transfer Switches - Closed Transition &
Open, Closed and Delayed Transition w/ Bypass Isolation. Enclosed Only.
Zenith is of the world leaders in emergency and standby power transfer
solutions, Zenith keeps your power on. Zenith is committed to providing a full
range of quality-driven products, backed by nationwide 24-hour service and
The switches in this group are designed for specific critical applications.
They are utilized in industrial standard applications requiring dependability and ease of operation. These switches combine reliability, flexibility and ease of use in a rugged industrial package.
All these switches work together with any remote-start generator that use two-wire control, allowing the standby power system to be fully automatic.
Designed for specific applications, this Series builds on ZTS technology while providing a pre-engineered project solution.
The ZTS Series is the building block of our transfer switch
product line including all the switches shown on this page. This ruggedly built power contactor family of switches has been
specifically designed for transfer switch duty with dependability, versatility
and user friendliness of prime concern. These special switches are available in NEMA
enclosures to the customer’s specifications.
ZTSCT Closed Transition
Loads such as
electronic equipment, HID lighting, motor starters and the like are
sensitive to even the 30- to 100-millisecond outage experienced during a
typical transfer switch operation. Therefore, testing and use of the
standby system may not be optimized and necessary system checks may be
omitted, because of concerns about the effects of transfer. In addition, opportunities for peak shaving
and utility incentive rates may be passed over because of the inability
to accept short power interruptions.
GE Zenith's proven switching technology combines with
controls developed through years of experience with synchronizing
switchgear to provide worry-free transfers in a closed transition mode.
With GE Zenith Controls' high-speed drive system, the overlap of the
normal and alternate sources is less than 100 milliseconds. When one
source is not within normal limits, such as during a power outage, the ZTSCT operates in an open transition mode. Closed transition operation (no power interruption) during
transfer and retransfer when sources are within specified
Open transition transfer operation is initiated upon a source
In critical applications such as hospitals, data
centers and airports, power cannot be interrupted for maintenance of
automatic transfer switches. In such circumstances, a bypass-isolation
switch is essential and is often required by code.
This model is 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 Ge Zenith ZTS Series
automatic switches with a quick make/quick break bypass switch manual
load transfer handle and the SZenith 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.
ZBTSD Bypass-Isolation-Delayed Transition
The ZBTSD Series incorporates the features of the
ZBTS Bypass-Isolation Switch with those of the ZTSD unit for transfer of
large motor loads, transformers, uninterruptible power supplies (UPS)
systems or load shedding to a neutral "off" position.
In critical systems such as those of hospitals
and airports, power cannot be interrupted for maintenance and testing of
automatic transfer switches (ATSs). In
such circumstances, a bypass-isolation switch is essential and often
required by code. The GE Zenith Controls ZBTSD Series Delayed Transition
Transfer/Bypass-Isolation Switch meets requirements for inspection
and/or maintenance of the delayed transition transfer switch without
power interruption. The ZBTSD Series
incorporates the rugged construction of all GE Zenith ZTS Series
switches with a quick-make/quick-break manual load transfer handle and
Zenith control/interlock system, consisting 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
ZBTSCT Closed Transition-Bypass Isolation
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 GeneratorJoe
representative early in the project cycle to ensure proper application.
Features for all
ZTSCT, ZBTS, ZBTSD & ZBTSCT
Series Transfer Switches
Load is not interrupted during bypass & isolation operation
Automatic transfer switch is located on a draw-out mechanism to
Emergency power systems can be electrically tested without
disturbing the load
Power cables do not have to be disconnected to remove automatic
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
Diagnostic lights and detailed instructions for simple
Mechanical and electrical interlocks ensure proper sequence of
Bypass switch contacts are closed only during the
Silver-plated copper bus interconnection of the transfer and
bypass switches on all sizes.
- GE Zenith’s
ZTSCT, ZBTS, ZBTSD & ZBTSCT
Series Transfer Switches are designed for
emergency, critical and life support standby and prime power applications.
- Standard models in stock, dropped shipped to your location.
FREE SHIPPING when purchased with a generator!
- Sizes include 40 to 4,000 amps with 2, 3 or 4 pole configurations.
- Available 120/240 VAC, 120/208 VAC, 277/480 VAC and other voltages up to 600
VAC. See Factory Brochure under Additional Information.
- Switch is true double throw, mechanically interlocked and mechanically held, electrically operated utilizing a reliable, field-proven single solenoid operator.
- Switch mechanism absolutely prohibits connecting both sources together. Cannot be over-ridden.
- Available in ZTSCT
(utility-generator), ZTSCTU (utility-utility), ZTSCTM (manual) configurations.
- Available in NEMA Type 1 (indoor), 3R (outdoor) enclosures and open (back-panel mounted) configurations as well as NEMA 4, 4X & 12.
- Dimensions shown on ZTS Dimensions under Additional Information.
- GE Zenith’s
ZTSCT, ZBTS, ZBTSD & ZBTSCT switches are equipped with the
MX250 control panel. This microprocessor control includes:
- Under-voltage sensing (90% pickup, 80% dropout) of Source 1 (normal).
- Voltage and frequency sensing of Source 2 (emergency), (90% voltage, 95% frequency pickup).
- Time Delay Engine Start (P)
- 0-10 seconds, factory setting 3 seconds.
- Time Delay Engine Warm-up
(W) - Transfer to Emergency (Source 2) - 0 -5 minutes, factory setting 1 second.
- Time Delay Utility Stabilization/Retransfer to Utility (Source 1)
(T) - 0-60 minutes, factory setting 30 minutes.
- Time Delay Engine Cool Down
0-60 minutes, factory setting 5 minutes.
- Generator exerciser timer built-in. 365 day adjustable time setting. Factory set at 7 days. Exercises Source 2 with or without load.
- Switches feature contacts that are easily accessible for easy inspection and preventive maintenance.
- Rated for standby applications and intended for use only in optional (non-critical) standby systems in accordance with the National Electrical Code. NEC/NFPA 70, Article 702.
automatic transfer equipment standards.
- Not intended for emergency or life-support systems.
- Qualified and listed to
UL 1008, CSA 22.2 and IEC, 480 VAC 50/60 Hz for
- For technical data, dimensions, features, remote controls, monitoring, warranty and other information.
See Additional Information below.
We recommend ZTS switches when purchasing any standby or primary power generator systems. If you require
less features or a lower price point then this
series, See the ZTG series, See
ZTG & ZTGDT,
Residential, Commercial & Industrial Transfer Switches. If you require a switch that will handle large motor loads or inductive loads
(without special closures and bypasses,
ZTS Industrial Automatic Transfer Switches, Service Entrance. For Residential and commercial applications,
ZTX Light Duty Residential & Commercial Transfer Switches.
For ZTSCT Closed Transition,
ZBTS Automatic Transition Bypass, ZBTSD Delayed Transition Bypass and ZBTSCT
Closed Transition Bypass, See
ZBTSD & ZBTSCT, Industrial Automatic Transfer Switches. Prices and the most common accessories are online on this website for all models.
CALL FOR PRICING: Due to
the extensive array of types, options and accessories please contact the
GeneratorJoe sales department for competitive pricing. Call GeneratorJoe at 707
539-9003 or write
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