Primary Injection Test Sets Available For Rent From Protec

ETI PI-6000 Primary Circuit Breaker Test Set

Primary Injection Test Sets are high current units designed for testing and adjusting low voltage circuit breakers and other current actuated devices.  Typical test sets incorporate a variable high current ac output along with circuitry to measure the reactions of the breaker under test. 

Test sets are typically designed to operate on a single phase voltage source.  Input leads should offer a minimal amount of voltage drop from the input source to the input terminals of the test set.  Although most test sets are designed to operate satisfactorily at 95% to 105% of rated voltage, any drop in voltage below rated at the input terminals will result in a proportional decrease in the maximum available output on the test set.



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Many test sets will provide two output connections, parallel and series, to provide various voltage and current ratings so that the test set can adapt to a wide variety of test circuit impedances.  When reviewing a test set’s performance specifications pay special attention on how the manufacturer derived the output current values.  Many times the values given on the data sheet are based upon a no load situation.  If this is the case special attention must be given to the VA rating of the test set and the maximum voltage at the test set’s output.  If test leads are to be used to connect to the device under test special care must be taken on the type of test leads.  Due to the voltage drop from the inductive reactance of the test circuit, a significant loss of current will result for each inch of test lead.  Therefore, when choosing test leads, the length and size of the leads chosen will determine the maximum available test current.  The use of 4/0 welding cable is convenient for constructing test leads.  Paralleling of sufficient cables provides higher test currents.  Each cable can be fitted with a compression lug on each end, and then bolted to the output terminals or stab board of the test set and the breaker.  Also, the two cables between the test set and the breaker should be twisted together or bundled with tape or cord to maintain the close proximity which minimizes inductive reactance.

It is sometimes necessary to use bus bar in order to obtain the desired maximum current.  When using bus bar, the buses should be run in parallel and kept as close to one another as possible.

Related electrical test equipment available for rent from Protec:

ETI PI-1600B High Current Test Set

ETI PI-6000 Primary Circuit Breaker Test Set

Megger ODEN AT Primary Current Injection Test System

This electrical test equipment is available for rent, lease, or purchase from Protec Equipment Resources. We are here to help you with your testing equipment needs.

Wherever the job takes you (and the equipment), with Protec’s multiple locations, we always ship from the office closest to your desired drop location (if the electrical test equipment you need is in-stock at that location), and the equipment can be returned to the nearest office.

We always consider ALL shipping options in order to save you the most time and money.

Also, if you happen to be close to one of our many office locations, walk-ins are always welcome!

Rely on the Electrical Test Equipment Rental Experts, we are there when and where you need us.


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Editor’s Note: This post was originally published January, 2015 and has been updated freshness, accuracy and comprehensiveness.