Jump to latest post9. Which of the following is not a type of contactor used in circuit breakers?
Your Answer: Electro-pneumatic
Correct Answer: Vacuum
How is Vacuum not a type of contactor used in CB's?
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Junior Member
Posted November 24, 2019
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9. Which of the following is not a type of contactor used in circuit breakers?
Your Answer: Electro-pneumatic
Correct Answer: Vacuum
How is Vacuum not a type of contactor used in CB's?
Member
Posted November 24, 2019
I agree Vacuum contactor is a thing, but maybe they are using vacuum in the sense that you cannot DLRO across a vacuum. If so the question and answers are badly worded.Originally Posted by mmacdonell
Junior Member
Posted November 25, 2019
Isn't a contactor a device that is controlled by another voltage, like what you see in a motor starter? I didn't think circuit breakers had "contactors" except maybe in the control circuit.
Thinking about it now, vacuum is used to insulate when the contacts get opened. All the other options are what the circuit breaker uses to make contact.
Anybody know what were the rest of the options?
Probably clarify the exact wording of the explanation, all the other options are the operating mechanism of the breaker, rather than the contact itself. Typical confusing language. Ugh.
I apologize. I don't recall exactly what the other answers were, but I think it was something like the following:
a. Magnetic
b. Pneumatic
c. Electro-pneumatic
Anyway you slice it, though, I don't believe there are any breakers that are OPERATED by vacuum.
Lol I think old Mercedes windshield wipers and door locks have the patent on that.
