In many cases, the ACB may be standing still for a number of years without operating. But, when an abnormal condition occurs, they need to operate within a few milliseconds to isolate the fault and protect the system.
ACBs contain a number of moving parts that are working in close coordination. They require periodic inspection and maintenance to ensure that they operate reliably when required. Contact timings, contact bounce, non-simultaneity of contacts, contact travel and speed measurements, tripping current characteristics, static contact resistance, insulation tests, endurance tests, etc. are some of the tests performed on ACBs.
Crest manufactures a full range of circuit breaker testing products for OEMs for ensuring the quality of the product before delivery and for end users to ensure optimum performance of their assets.