ABB RER620 Technical Manual

1MAC309294-MB F Section 10
General function block features
RER620 465
Technical Manual
Figure 243: Trip time curves based on IDMT characteristic with the value of the
Minimum trip time setting = 1 second
10.2.1.1 Standard inverse-time characteristics
For inverse-time operation, both IEC and ANSI/IEEE standardized inverse-time
characteristics are supported.
The trip times for the ANSI and IEC IDMT curves are defined with the coefficients A, B
and C.
The values of the coefficients can be calculated according to the formula:

ABB RER620 Specifications

General

Brand	ABB
Model	RER620
Category	Controller
Language	English