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Product Description and Specifications

Series: GTX
Applications: Small Frame
Amperage: 40 – 400
Poles: No info
Voltage: 120 – 380V

The Zenith GTX Series of automatic transfer switches (ATS) are built for light industrial and commercial critical applications requiring the dependability and ease of operation found in a power contactor switch. The GTX transfer switches are designed for standby applications, and incorporate a double-throw, mechanically interlocked contactor mechanism.

The GTX transfer switches are equipped with the MX70 Microprocessor Control Panel.

This microprocessor includes:

  • Undervoltage sensing (90% pickup/80% dropout) of the utility source
  • Voltage and frequency sensing of the generator source (90% voltage/95% frequency pickup)
  • Time Delay Engine Start – 5 seconds (P)
  • Time Delay Engine Warmup – Transfer to Generator – 20 seconds (W)
  • Time Delay Utility Stabilization/Retransfer to Utility – 5 minutes (T)
  • Time Delay Engine Cool Down – 5 minutes (U)
  • Indicating LEDs for power availability, switch position and load energized
  • Push buttons for test, engine start (manual), generator exerciser, timer bypass and program cancel
  • Special status annunciation of in-phase transfer and timer operation
  • Selectable 7, 14, 21 or 28 day (factory set 28 days) generator exerciser timer
  • Diagnostic LED indications in logical one-line configuration All time delays are fixed.

The GTX Power Panel includes:

  • Double throw and mechanically held
  • Arc quenching grids, enclosed arc chamber and wide contact air gap
  • Fast contact transfer speed less than 100ms

The unit is available in open type, NEMA 1 or NEMA 3R enclosures. Additional options include:
A3/A4 Auxiliary contacts (1 each) closed in utility and generator positions
Integrated battery charger 1.5A/12V


  • Ratings 40 to 400 amps
  • IEC 60947-6:2013 Certified, Class PC
  • 2, 3, and 4 pole
  • Power contactor ATS
  • 120-416Vac rated voltage
  • 50/60 Hz rated frequency

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