Circuit Breaker Operation Time (In-Service)

In-service testing methods show degradation accumulated during long idle times better than their off-service counterparts because to prepare a breaker for off-service testing, it has to be operated at least once. For the First trip test method connections are made at the trip coils and the CT’s secondary side. These test methods are very well suited to detected degraded lubricants, contaminated surfaces or corroded mechanical elements.

Expert recommends


During a First Trip test, CIBANO measures the opening times by monitoring the CTs’ secondary current (please note that the measured time will include the arcing time).

Benefits of this solution



State-of-the-art circuit breaker testing MV / HV

Get in touch

Need more details? Get a quotation?
Request for a demo?

Contact us now
You are using an outdated browser version.
Please upgrade your browser or use another browser to view this page correctly.