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- First Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q517 - Electrical, Electronic, & Control Engineering
217. Which of the illustrated safety disconnect switches represents a double-throw switch
Switches B and D are double-throw because they have a handle or contact set that connects to two different ON positions. Double-throw switches connect a common terminal to one of two circuits, often labeled ON-OFF-ON, while single-throw switches have only one ON position. Switches A and C have only one ON/OFF function, and therefore are single-throw.
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