HV Exit Exam • Set 7 Question 2 of 30
For high-speed motor circuit breakers, the total closing time from command signal to contact touch is typically in the order of:
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Direct Answer
Option B: 50 to 100 milliseconds
High-speed vacuum and air motor circuit breakers typically have closing times between 40 to 100 milliseconds (0.04 to 0.10 s) to ensure rapid, bounce-free engagement.
All Options
A
3 to 10 milliseconds
B
50 to 100 milliseconds
(Correct Answer)
C
1 to 2 seconds
D
5 seconds
Detailed Explanation & Context
High-speed vacuum and air motor circuit breakers typically have closing times between 40 to 100 milliseconds (0.04 to 0.10 s) to ensure rapid, bounce-free engagement.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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