What characteristic is unique to a bar CT compared to other types of CTs?

The characteristic that is unique to a bar CT (current transformer) is its integration with a bus bar for connections. Bar CTs are designed specifically for applications where they can be mounted directly on bus bars, providing a compact and efficient way to measure current in high-power electrical systems. This integration allows for easier installation and better utilization of space within electrical panels and switchgear.

In contrast, other current transformers may be designed for different mounting types or may not be directly associated with bus bars, making them less suitable for high current applications where space and efficiency are concerns. Consequently, the ability to integrate with bus bars is a distinct and beneficial feature of bar CTs, enhancing their practicality in industrial and commercial electrical installations.