What type of contacts does a starter have that opens the power circuit when the control circuit is energized?

The type of contacts that opens the power circuit when the control circuit is energized is typically referred to as normally closed contacts. These contacts are designed to remain closed (providing continuity in the power circuit) under normal conditions. When the control circuit is energized—usually through a start button or other control device—the normally closed contacts open, interrupting the flow of power to the motor or equipment being controlled. This mechanism is essential for safety and control in electrical circuits, ensuring that the equipment can be safely turned off when needed.

The other options involve descriptions that don't apply accurately to contact behavior in this context. Normally open contacts, for example, become closed only when the control circuit is energized but do not serve the same function of interrupting power in the way that normally closed contacts do. The terms normally active and normally passive do not correspond to standard electrical terminology used for contact types in starters.