GE Products BuyLog Smart Catalog

Automatic Transfer Switches Critical Power Products

Section 14

Introduction

Automatic Transfer Switches It is imperative that emergency power systems allow for a smooth transition from a normal source to an emergency source and back again. Our automatic transfer switches are field-proven to be superior in design and reliability, regardless of the application. Model ZTX is built specifically for residential and light commercial applications. The switches are ideal for standby applications, and are available as NEMA 1 or NEMA 3R enclosed. Model ZTG is a product solution designed for standard open transition applications. Building on ZTS technology, the series uses the MX150 microprocessor control system and includes many of the most common features specified on a transfer switch. It also provides an intuitive user interface, communications capability and self-diagnostics. Model ZTGD has the features of the ZTG Series but is built for de- layed transition applications that require the dependability and ease of operation of a power contactor switch. Model ZTGSE has the features of the ZTG Series but is built for a service entrance application that integrates the utility circuit breaker, optional surge protection device and power monitor into one simple coordinated package. Model ZTGDSE has the features of the ZTG Series but is built for delayed transition service entrance application that integrates the utility circuit breaker, optional surge protection device and power monitor into one simple coordinated package. Model ZTS is the building block of the transfer switch product line. Available in open type or NEMA enclosed to customer specifica- tions, the ZTS withstand and closing ratings far exceed UL require- ments and comes standard with our MX250 controller. Model ZTSD of delayed transition transfer switches allows for the full decay of rotating motors or transformer fields. They can also be used for load shedding of selected circuits or other applications. Model ZBTS Bypass-Isolation Transfer Switches are the solution when power interruption during service or testing is unaccept- able. Incorporating a quick-make/quick-break manual load trans- fer handle and GE Zenith Controls control/interlock system, the bypass uses normal failure sensing and a time delay to start the engine automatically if a failure occurs when the automatic trans- fer switch (ATS) has been removed for service. Model ZBTSD Delayed Transition Transfer/Bypass-Isolation Switches incorporate the features of the ZBTS Bypass-Isolation Switch and the ZTSD unit for transfer of large motor loads, transformers, uninterruptible power supplies (UPS) systems or load shedding to a neutral “off” position. Model ZTSCT of closed transition switches combine ZTSD operation during a source failure with a highly engineered control system that allows momentary paralleling of two acceptable sources, limiting the impact of transfer on the load. Model ZBTSCT Closed Transition Transfer/Bypass-Isolation Switches combines all the functionality of our bypass and closed transition switches for the highest level in reliability.

Model ZTSMV Medium Voltage Automatic Transfer Switches are designed for installations from 5 kV to 15 kV and loads up to 3000 amps. Model ZTE is specifically designed for large healthcare and mission-critical applications, with built-in metering, communications and advanced diagnostics. ZTE Automatic Transfer Switches go beyond simply source switching and are available from 40-4000A and 120-600V. ZTE Series, Standard (Open) Transition. The GE Zenith ZTE stan- dard (open) transition transfer switches go beyond just source switching. Integral metering and communications, high-level diagnostics and superlative flexibility make the ZTE a perfect solution for today’s mission critical source switching. ZTED Series, Delayed Transition. The ZTED - Delayed Transition transfer switch offers the same features as the ZTE with the addition of an adjustable time delay in the centered "off" posi- tion. This delay allows motor loads to coast down and trans- former field to decay; ensuring inductive loads are re-energized after transfer with only normal inrush starting currents. ZTECT Series, Closed Transition. The ZTECT -Closed Transition transfer switch offers the same features as the ZTE with the addition of a high-speed drive system, which ensures the overlap of the normal and alternate sources is less than 100 millisec- onds. When one source is not within normal limits, such as dur- ing a power outage, the ZTECT automatically operates in delayed transition mode.

Rev. 1/19 Data subject to change without notice

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