Which of the following refers to an assembly containing motor control units with a common power bus?

The term that refers to an assembly containing motor control units with a common power bus is Motor Control Center, often abbreviated as MCC.

An MCC is a centralized location for controlling multiple electric motors. It typically houses motor starters, circuit breakers, variable frequency drives (VFDs), and other control equipment, all sharing a common power supply or bus. This arrangement allows for efficient organization and management of motor operations, facilitating easier maintenance and operational efficiency.

Understanding the structure and components of an MCC is crucial for electrical professionals, as it provides insights into how complex motor systems are efficiently controlled and monitored. These centers play a vital role in industrial settings where multiple motors need to be managed simultaneously. The functionality of an MCC contrasts with other types of assemblies which may not focus specifically on motor control or do not utilize a shared power bus in the same manner.