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Trace T240 Autotransformer


Step up: Allows you to power 240 VAC loads from a single 120 VAC inverter/charger. This is typically done for powering deep well pumps or other dedicated high power 240 VAC loads.

Step down: Allows you to connect a large 120 VAC load to the output of a stacked pair of DR or SW inverters (120/ 240 VAC). This results in the inverters sharing the load, allowing higher performance and efficiency.

Balancing Transformer: Allows a single 120 VAC inverter to be connected to a generator which has 240 VAC output. Keeps the generator balanced for better performance and operating life. Balancing the generator’s output also allows higher charge rates from your battery charger.

Product Features

  • Indoor powder coated enclosure with knockouts for conduit connections

  • Two pole 25 A circuit breaker/disconnect

  • Two year warranty


  • Up to six additional Square D QOU breakers for additional input/output wiring protection

Electrical Specifications


AC input/output voltage

120 / 240 VAC +/-10% at 60 Hz

Continuous power (at 25˚C)

3900 VA as a step down /step up transformer or balancing transformer

Idle consumption (typical at full voltage)

12 watts

Insertion loss

Less than 4 VAC at 3900 VA

Input/output AC breaker rating

25 A 2 pole Square-D QOU Branch Circuit Rated /10,000 AIC

General Specifications

Hookup wire size

14 AWG to 2 AWG

Hookup access

3/4” and 1” knockouts

Enclosure type

 Indoor, ventilated, steel chassis with powdercoat finish

Dimensions (H x W x D)

6.3 x 21.0 x 7.0” (16 x 53.3 x 17.8 mm)


39.4 lb (17.9 kg)


Two years

Regulatory Approvals

UL approved to standards

UL 1741 - 1st Edition

cUL approved to Canadian standard

CAN/CSA C22.2 No. 107.1-95

Note: Specifications subject to change without notice.

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Last modified: January 12, 2023