Thomson Power Systems · TS930 Series (IEC)

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Thomson TS930 IEC Automatic Transfer Switch

Automatic Transfer Switches

IEC-certified automatic transfer switch for export and international markets. 125-2000A, 3-pole, open transition, contactor switching, graphical LCD controller. IEC 947-6-1 compliant.

Overview#

The Thomson TS930 is an IEC-certified automatic transfer switch designed for export and international markets. Covering 125A to 2000A in three-phase 480V configurations, it uses contactor-based switching with a microprocessor controller to automatically start a generator and transfer system load during utility failure, then retransfer to utility when normal power is restored.

The TS930 is manufactured in compliance with IEC 947-6-1 (the international equivalent of UL 1008) and features electrical and mechanical interlocking that prevents simultaneous closure of utility and generator sources. The door-mounted controller provides a graphical LCD display with programmable timers and protection setpoints for field configuration.

Where the TS930 fits#

The TS930 is Thomson's answer for projects outside the UL/CSA regulatory framework. Key positioning:

  • IEC certification — for markets in Latin America, the Middle East, Africa, Asia, and Europe where UL 1008 is not recognized
  • IEC amperage steps — 125A, 630A, 1250A follow IEC frame sizing conventions rather than NEMA (150A, 600A, 1200A)
  • Higher ceiling — reaches 2000A vs the TS970's 1200A maximum, covering larger international installations without stepping up to the mission-critical TS880
  • Contactor switching — same proven mechanism as the domestic TS970, with fast transfer speed suitable for commercial and light-industrial applications

Typical installations: international data centers, hospitals, wastewater treatment plants, commercial buildings, and industrial facilities in non-UL markets.

TS930 vs domestic alternatives#

FactorTS930 (IEC)TS970 (UL)TS870 (UL)
CertificationIEC 947-6-1UL 1008UL 1008
Amperage range125-2000A100-1200A100-1200A
SwitchingContactorContactorMechanically-held
TransitionOpen onlyOpen onlyOpen + closed
Voltage480VUp to 480VUp to 600V
MarketInternational/exportNorth AmericaNorth America

For North American projects, specify the TS970 (contactor) or TS870 (mechanically-held) instead. The TS930 is specifically for installations where IEC certification is required by the local authority having jurisdiction.

Our service experience#

We occasionally encounter Thomson TS930 units on international projects specified by U.S.-based engineering firms for overseas facilities. The contactor mechanism and controller are functionally similar to the domestic TS970, so field service techniques transfer directly. The IEC amperage steps (630A instead of 600A, 1250A instead of 1200A) require attention during specification review to ensure proper conductor and overcurrent protection sizing per local electrical codes.

Frequently Asked Questions

What is the Thomson TS930 designed for?
The TS930 is Thomson's IEC-certified automatic transfer switch designed specifically for export and international markets where IEC 947-6-1 certification is required instead of UL 1008. It covers 125A to 2000A in three-phase 480V configurations and uses contactor-based switching with a door-mounted graphical LCD controller. Typical applications include data centers, healthcare facilities, wastewater treatment plants, and commercial buildings outside North America.
What amperage ratings are available for the TS930?
The TS930 is available in 125A, 200A, 400A, 630A, 800A, 1000A, 1250A, 1600A, and 2000A ratings. All models are three-phase, 3-pole configurations at 480V. The amperage steps follow IEC standard frame sizes rather than the NEMA frame sizes used in Thomson's UL-listed products.
How does the TS930 differ from the TS970?
Both are contactor-based ATS units, but they serve different markets. The TS970 is UL 1008 listed for the North American market (100-1200A, up to 480V). The TS930 is IEC 947-6-1 certified for international markets (125-2000A, 480V). The TS930 uses IEC-standard amperage steps (125A, 630A, 1250A) rather than NEMA steps (150A, 600A, 1200A). The TS930 also extends to 2000A, 800A higher than the TS970's maximum.
What controller does the TS930 use?
The TS930 uses a door-mounted ATS controller with a graphical LCD display. The controller provides user-programmable timers and protection setpoints, voltage and frequency sensing on both sources, automatic engine start signaling, and exercise scheduling.
What warranty does the TS930 carry?
The TS930 carries a 2-year warranty from Thomson Power Systems, which is longer than the standard 1-year warranty on some other Thomson products.

Service Specifications

ServiceFrequencyNotes
Exercise under loadMonthlyRun generator and transfer load; controller has built-in exercise timer
Connection torque inspectionAnnuallyRetorque all power lugs per Thomson spec
Contactor inspectionEvery 3-5 yearsCheck contactor contacts for pitting; verify snap-action operation
Controller firmwareAs releasedCheck with Thomson for latest firmware revision

Key Terms

IEC 947-6-1
International Electrotechnical Commission standard for automatic transfer switching equipment. The IEC equivalent of UL 1008, used in markets outside North America where UL listing is not required or recognized.
Contactor switching
Electromagnetic switching mechanism where contacts are held closed by a continuously energized coil. Provides fast transfer speed and is well-suited to applications with regular transfer cycles.
Open-transition transfer
A brief interruption between disconnecting from one source and connecting to the other. Standard for most international standby power applications.

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