The Zenith ZTG Series of transfer switches are built for general purpose commercial and industrial applications requiring the dependability and ease of operation found in a power contactor switch. The ZTG series uses the MX150 microprocessor control system, which includes features specified on a general purpose commercial and industrial applications. It also provides an intuitive user interface, communications capability and self diagnostics. The ZTG Series is available in a full range of ampere, voltage and pole configurations, along with many commonly requested options and features.



  • ZTG - Standard (Open) Transition
    The Zenith ZTG transfer switch is used in general and mixed load applications .
  • ZTGD - Delayed Transition
    The Zenith ZTGD transfer switch is used to transfer of motor loads, and transformers.

Features and Benefits

  • Close differential under-voltage sensing of the normal source
  • Voltage and frequency sensing of the emergency source
  • Test switch (fast test/load/no load) to simulate normal source failure - automatically bypassed should the emergency source fail
  • Double throw, interlocked operation
  • Electrically operated, mechanically held by a simple, over-center mechanism
  • Segmented silver tungsten alloy contacts with separate arcing contacts on 600 amps and above
  • Arc quenching grids, enclosed arc chambers and wide contact air gap for superior source-to-source isolation on all units
  • Control circuit disconnect plug and drive inhibit switch for safe maintenance
  • Components accessible for inspection and maintenance without removal of the switch or the power conductors
  • Mechanical indicator and contact chamber cover designed for inspection, safety and position designation


  • UL 1008 listed at 480 VAC
  • CSA 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
  • ISO 9001 certified manufacturing plant
  • Durable, long-life solenoid operated mechanism
  • GE-engineered and manufactured contacts and arc quenching components
  • UL 3-cycle (unconditional) short circuit withstand & close ratings
  • OSHPD seismic qualifications

Product Scope

  • Ratings 40 to 3000 amperes
  • 120 - 600 Volts
  • 50 or 60 Hz
  • 2, 3 or 4 poles
  • Double throw, mechanically interlocked contactor mechanism
  • Suitable for emergency and standby applications
  • Open type, NEMA 1, 3R, 4, 4X and 12 enclosures