Final answer:
Vacuum contactors are quieter and can control higher voltages in a smaller space than standard contactors; they don't necessarily require a vacuum pump in operation.
Step-by-step explanation:
The question relates to vacuum contactors, which are a type of electrical switch designed to turn on and off the high-power circuits using vacuum as the arc extinguishing medium.
Vacuum contacts:
- Are quieter in operation than standard contactors because they operate in a vacuum, which eliminates the sound of the arc that normally occurs in air when contacts are opened or closed.
- Can control higher voltages in a smaller space since the vacuum provides excellent dielectric strength, allowing for compact designs.
- Are not necessarily more economical to purchase than conventional contactors. The cost-efficiency depends on the specific application and the operational requirements.
- Do not require the connection of a vacuum pump when in operation because the vacuum is maintained in a sealed chamber within the contactor itself.