Maintenance Mode Trip

Some circuit breakers have an additional instantaneous trip setting that can be turned on during maintenance work. In the case of faults, this results in fast tripping, limiting the arc flash incident energy. During normal operation this trip is set to “Off” for selective coordination. This additional trip may be known as maintenance mode or have commercial names such as ARMS, Quick-Trip, RELT, and so on.

While performing coordination of protective devices, the maintenance mode trip needs to be set “Off.” While you are in Coordination focus or Short Circuit focus, you can turn the maintenance mode setting on or off through the right-click context menu as shown below. This affects the selected breakers. You can also the highlight the breakers that have the maintenance mode setting set to "On."

Figure 1: Maintenance Mode Context Menu

More Information