This video shows some timing tests made with the VCB demonstrating the tripping time of about 18 ms (which is less then 1 cycle of power frequency!) with pole descrepancy about 1 ms.
Related EEP's content with sponsored links
Premium Membership
Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
More Information
How do you test a vacuum circuit breaker
Please post the video for contact resistance test for busbar