Frequently asked questions
Secondary injection testing vs. primary injection testing for circuit breakers
FA175036
28 September 2021
Issue:Secondary injection testing vs. primary injection testing for circuit breakers
Product Line:
Molded Case Circuit Breakers
Resolution:
Secondary injection testing:
- Can be done on electronic breakers only
- Quick
- Tests the trip unit only
- Easier
- Takes less expertise to run the test
- Test kit is small and portable
- Less expensive
- Can be done on thermal magnetic and electronic breakers
- Time intensive
- Tests complete breaker from the CT, CT wiring to the trip unit, and the trip unit
- Takes more expertise to run the test
- Equipment is heavy and less portable
- More expensive