What is the difference between primary and secondary 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

Primary injection testing:

• 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

Released for: Schneider Electric USA