What is the result of the control circuit power being OFF?

When the control circuit power is OFF, it typically means that there is no electrical energy supplied to the control components that regulate the operation of connected devices such as motors or relays. In this scenario, both M1 and M2, which likely represent motor starters or similar devices, rely on the control circuit to receive their power.

In a standard control circuit configuration, when control power is lost or turned off, the devices controlled by the circuit will not receive the necessary signals or electrical power to operate. As a result, they will revert to a de-energized state. This state is essential for ensuring safety, preventing unintended operation of equipment, and allowing for maintenance activities.

Understanding the principle of control circuits is crucial, as it emphasizes how control mechanisms govern the status of electrical devices. When control power is interrupted, the default condition is to de-energize the devices, which is indicated in this answer. This underscores the importance of control circuits in managing power flow to electrical devices, ensuring they operate only when intended.