Accessories - 09311A 400 A 20:1 Precision CT, 0.1 % Accuracy

Summary Information

Extends the outstanding accuracy, features, and performance of Models 931A, 930A and 929A by increasing the current input capability to 400 amperes. Available on Models 931A, 930A, and 929A.

Full Description

The Model 09311A 20:1 Auxiliary Current Transformer extends the outstanding accuracy, features, and performance of the Model 931A Power System Analyzer, the Model 930A Three Phase Power Analyzer, the Model 929A Three Phase Power Meter by increasing the current input capability to 400 A. Due to the careful design of the Model 09311A Auxiliary CT, overall accuracy exceeds 0.1 % of reading and 0.1 ° over the entire input current range of 1 A rms to 400 A rms.

The Model 09311A input terminals have large 5/16 in silicon-bronze cap screws to firmly connect your input signals. The output connections to the Model 931A are via two heavy-duty copper spade lugs, which connect directly to the Model 931A current input terminals. Due to the narrow profile of the Model 09311A's design, up to three Model 09311As may be simultaneously connected to the Model 931A's three current inputs, allowing three-phase measurements up to 400 A.

The Model 931A's, Model 930A's, and Model 929A's SCALE function includes a selection which will enable the required 20:1 calibration factor to allow the instrument to display the actual current applied to the Model 09311A input. No conversion is necessary; it is performed automatically by the microprocessor and automatically applied to all displayed results.

For ease of storage and accessibility, up to three (3) Model 09311A current transformers can attach to the transit case of the Model 931A, the Model 930A, or the Model 929A. The mounting bracket is included with 09311A and can be optionally ordered for Models 931A, 930A and 929A. Order part number AS0036000.


  • Range: 0.8 A to 400 Arms
  • Burden: 14 μohms
  • Accuracy:
    • Amplitude: 0.1 % of reading
    • Phase: 0.1 °
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