Automatic Bus Transfer switches power between which two modes?

Automatic Bus Transfer switches power between which two modes?

• A. Standby to Active
• B. Manual to Automatic
• C. Off to On
• D. Normal to Emergency

Answer: (D)

Automatic transfer switches are used to keep critical equipment powered by moving the load from the normal (primary) power source to an emergency (backup) source when the normal source fails or goes out of spec, and then back again when normal power returns. That means the two modes they switch between are Normal and Emergency. The other options describe changes in control state or an on/off action, not the actual source pairing the ATS manages. In practice, the goal is seamless power continuity by automatically transferring to the emergency source and back as needed.

Automatic transfer switches are used to keep critical equipment powered by moving the load from the normal (primary) power source to an emergency (backup) source when the normal source fails or goes out of spec, and then back again when normal power returns. That means the two modes they switch between are Normal and Emergency. The other options describe changes in control state or an on/off action, not the actual source pairing the ATS manages. In practice, the goal is seamless power continuity by automatically transferring to the emergency source and back as needed.