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Test Micrologic, NT and STR Trip Units with the Square D by Schneider S33595

Methods of testing circuit breakers:

  • Primary Injection – done by injecting the actual current required to energize the circuit breaker. This test makes the circuit breaker interrupt large currents thus shortening its life.
  • Secondary Injection – done by injecting a current with the contacts closed but with no current flowing on the poles. This is a better way of testing circuit breakers because it uses low voltage signals that are injected to the circuit breaker which prolongs the operating life.


The Square D by Schneider S33595 Secondary Injection Test Set, a full function Secondary Injection Test Set kit is designed to perform tests on Micrologic, NT and STR Trip units.  

Square D by Schneider S33595 applications:

• Secondary Injection Testing
        • Manual Trip Curve Test
        • Automatic Trip Curve Test

• Zone-Selective Interlocking Test
• Ground-Fault Inhibit
• Thermal-Imaging Inhibit


Related electrical test equipment available for rent from Protec:

ABB TS3 Trip Unit Test Set

Eaton Cutler Hammer 70C1056G52 Functional Test Kit

Siemens PTS-5 Secondary Injection Test Set

Utility Relay Co. B-292 Secondary Injection Test Set

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.

Protec’s Calibration Lab offers accurate and affordable calibration services for all makes and models of electrical test and measurement equipment. Contact us today for a quote.

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