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Home > Products > Transfer Switches > Ge Zenith > ZT3ST%2C%20ZT3DT%2C%20ZT3CT

MODEL: ZT3ST, ZT3DT, ZT3CT - ZT30 Series - Standard (Open), Delayed or Closed Transition

CALL FOR A QUOTE: 1-800-370-3261

> Download PDF Specs Sheet for this Product
Model NumberSeriesApplicationsAmperagePolesVoltage
ZT3ST, ZT3DT, ZT3CTZT30 - 30 CycleCritical Applications1,000 - 3,0003 or 4600V max


The Zenith ZT30 is a UL tested 30-cycle short time rated Automatic Transfer Switch that is utilized with Over Current Protective Devices (OCPD) to facilitate selective coordination. The ZT30's industry leading short time rating and best-in-class footprint greatly simplifies the selective coordination design process and provides the utmost in system design flexibility for future system growth. The ZT30 supplies 100% rated power to loads after an overcurrent event, helping to maximizing power distribution system reliability and uptime.

The ZT30 is available in standard, delayed and closed transition modes as well as in bypass-isolation.


ZT3ST - Standard (Open) Transition
The Zenith ZT3ST transfer switch is used in general and mixed load applications.

ZT3DT - Delayed Transition
The Zenith ZT3DT transfer switch has an adjustable time delay in the centered "off" position. This delay allows motor loads to coast down and transformer field to decay; ensuring inductive loads are re-energized after transfer with only normal inrush starting currents.

ZT3CT - Closed Transition
The Zenith ZT3CT transfer switch is used in critical/life safety applications where a "no break" transfer is desired during periodic testing and maintenance.


  • Reliability / Performance
    -Facilitates selective coordination design
    -Maximizes system uptime & reliability
    -Industry-leading short time rating (withstand & close-on)
  • Safety
    -Manual Quick Make/Quick Break operation
    -Manual operation with the door close
    - "Shutter System" - for bypass switches adds another of layer of protection during maintenance
  • Ease of Installation/Maintenance
    -100% top or bottom cable entry
    -Interchangeable source cable terminations
    -Mechanical switch position indicator
    -Master terminal connection for customer control wiring
    -Cable bracing not required
  • Space Optimization/Flexibility
    -Best-in-class footprint
    -3-pole & 4-pole in the same footprint
    -Field upgradeable from 3-pole to 4-pole
    -Simple field configurable voltage selection


  • 30 Cycle Short Time - UL1008 Listed, Tested and Labeled
  • Transition Type: Standard, Delayed, Closed
  • Amperage Rating: 1000A to 3000A
  • Poles: 3 or 4 pole switching
  • Voltage: 600VAC max
  • Short Time Rating:
    -85kA: 30 Cycle (0.5s)
    -100kA: 3 cycle
  • Withstand and Close-on Rating:
    -100kA: 3 Cycle
    -200kA: with Current Limiting Fuse Class L
  • Transfer Time:
    -Standard (Open) Transition: ~ 30ms to 70ms
    -Delayed Transition: ~ 80ms (Customer Programmable Time Delay Setting)
    -Closed Transition: Less than 100ms parallel
  • Enclosure Types: Open Style, NEMA 1, NEMA 3R, NEMA 4, NEMA 4X, NEMA 12
  • Microprocessor Controller: MX250, MX350
  • Certifications: UL/cUL rated up to 600V at 50/60Hz, Seismic Qualified to IBC-2009 & IEEE 693-2005, OSHPD
  • Code Compliance: NFPA 70, 99, 101, 110; IEEE 446, 241, 602; NEMA ICS 10, CC1 (lug)
  • Enclosure Compliance: UL 50, UL 508, NEMA 250

Call us toll free at 1-800-370-3621 or send us a message now. We’re here to help.

© Copyright 2017 Kentech Inc.

Houston, TX (Headquarters)
21855 E. Hammond Dr.
Porter, TX 77365 | Map
(281) 358-0980
(800) 370-3621
Send us a message
San Antonio, TX
7943 E. Evans Rd.
San Antonio, TX 78266 | Map
(210) 946-2474
(800) 370-3621
Send us a message