When it comes to inspecting and maintaining protective relays and circuit breakers, the secondary injection test kit is the go-to piece of electrical test equipment that every tech and field worker needs.
Trip units must be checked periodically to ensure that there are no defects or faults developing within the system. Because trip units protect workers from injury and equipment from failure, testing them becomes vital within organizations.
The Siemens PTS-3 Secondary Injection Test Set offers users a portable tool to conduct testing of trip units used within LA and RL lines of circuit breakers. These low voltage breakers must be regularly tested for defects and to ensure they are functioning correctly. This Siemens model allows for tests to magnetic tripping actuators as well as other operational characteristics of the device.
Since the PTS-3 is powered from a 120 volt outlet, it is a much simpler and less costly method of verifying the proper operation of these trip devices than using primary current injection to perform this testing. In fact, the static trip III device may be tested while installed in the circuit breaker or independent of the circuit breaker assembly. In addition to the cost effectiveness of using a PTS-3 instead of primary current injection, there is a lessened concern for safety in that testing is performed at significantly reduced levels of electrical energy.
Related electrical test equipment available for rent from Protec:
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Editor’s Note: This post was originally published June, 2012 and has been updated freshness, accuracy and comprehensiveness.