Skip to main content

Edit Curve

The Edit Curve command is used to set or modify the curve for a distribution equipment or equipment connection in a selective coordination graph. See the Reading and Configuring Time-Current Curves article in the knowledge base for more information about how the settings in this dialog box affect the curve.

To set or modify a curve, go to
Ribbon: DM Electrical→Distribution Equipment→  Edit Curve
Pulldown Menu: DM Electrical→Distribution Equipment Schedules→Edit Curve

You will be prompted to specify a curve on a selective coordination graph to edit.

Select curve to edit:

Select Curve Dialog Box

The curves displayed in this dialog box change depending upon the trip size of the breaker. If the breaker you want to use is not available, contact us so we can add it to the database.

  •  Equipment: The name of the distribution equipment or equipment connection and the curve being modified.

  •  Trip Size: The Trip ▾ or Upstream OCP ▾ value set in the Distribution Equipment Dialog Box, or the Trip ▾ or Breaker Size ▾ value set in the Create Equipment dialog box.

  •  Manufacturer ☰ The list of manufacturers for the specified Trip Size.

  •  Group ☰ The list of breaker types for the specified Manufacturer ☰ and Trip Size.

  •  Breaker / Fuse ☰ The list of breaker/fuse models for the specified Manufacturer ☰, Group ☰, and Trip Size.

  •  Long-time Delay ☰ This value determines how long the breaker will allow lower current increases before tripping. Applies to electronic trip breakers.

    If the selected breaker allows the installer to input values digitally, the range and increments that can be input for this value will be displayed. Enter the value in the field below this list.

  •  Short-time Pickup ☰ This value determines the current at which the trip switches from the Long-time Delay ☰ to the Short-time Delay ☰. Applies to electronic trip breakers.

    If the selected breaker allows the installer to input values digitally, the range and increments that can be input for this value will be displayed. Enter the value in the field below this list.

  •  I²T ☰ This value determines whether the Short-time Delay ☰ value stays constant or varies depending upon the current. Applies to electronic trip breakers.

  •  Short-time Delay ☰ This value determines how long the breaker will allow higher current increases before tripping. Applies to electronic trip breakers.

    If the selected breaker allows the installer to input values digitally, the range and increments that can be input for this value will be displayed. Enter the value in the field below this list.

  •  Instantaneous Pickup ☰ This value determines the current at which the breaker trips immediately.

    If the selected breaker allows the installer to input values digitally, the range and increments that can be input for this value will be displayed. Enter the value in the field below this list.