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Siemens PTS-5 Designed for Secondary Injection Testing of the Static Trip III

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Siemens_PTS-5Designed for performing secondary injection testing of the Static Trip III (STIII) overcurrent tripping system utilized on the RL breaker, the Siemens PTS-5 Secondary Injection Test Set is packaged in a self-contained case and requires 120VAC to operate.

The Siemens PTS-5 contains a microprocessor controlled constant current source which enables rapid verification of the performance of the STIII.

The desired test current may be directly entered with a numeric keypad for ease of test configuration. The self-contained, automatically controlled digital timer allows simple verification of the time-current tripping characteristics. The Siemens PTS-5 also provides a regulated DC voltage to allow functional testing of the tripping actuator.

The incoming power is converted to a filtered and regulated DC bus. From this DC supply, the testing current is generated using a current amplifier regulated by the microprocessor and a precision digital to analog converter. This provides for stable test current even when the incoming line voltage fluctuates, and helps to eliminate discrepancies that may occur if a line-derived current source is used for testing.

The test current is applied to the current inputs on the STIII, either by a jumper cable for on-breaker testing, or alternatively, the STIII may be connected to a terminal block on the face of the Siemens PTS-5 for standalone testing. The STIII connection also provides for the trip feedback that stops the clock and the test current automatically.


  • Input – 120 Volts, 50 or 60 Hz, 15 Amps Maximum
  • Output – 0 to 120 Volts, 15 Amps Maximum
  • Maximum continuous current on high scale 1.0 Amp
  • Maximum continuous current on low scale 0.75 Amp
  • DC output for actuator test – 0 to 22 Volts Open Circuit

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