NHP TemBreak PRO - Pre-Defined Curves

Protection Settings
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TemBreak PRO B_BE-UM-001-EN  V1.1.0
Pre-Defined Curves
The B_BE does not allow full customisation of the LSI protection functions; however, it does allow the election of several pre-defined protection curves,
which cover a wide range of applications and industry requirements. Most pre-defined curves also offer adjustment of I
r
to shift the curve along the current
(I) axis for better refinement
Example – pre-defined time current curve selection for B1000_BE:
Not all curves are adjustable with the I
R
dial, and are either a fixed current value, or calculated from the trip unit current rating I
n
, as illustrated in the following
table:
Pre-defined curve number
1
2
3
4
5
6
7
8
9
10
B250 I
n
= 40A, 125A, 250A
R
R
R
R
R
F
F
N
─
─
B250 I
n
= 160A
R
R
R
R
R
─
─
─
─
─
B400
R
R
R
R
R
R
R
F
F
N
B800 / 1000 / 1250 / 1600
R
R
R
R
R
R
R
R
R
R
R
Adjustable current with I
R
dial
F
Fixed current
N
Calculated current from trip unit rating I
n
Notice: Pre-defined curves can differ between MCCB models and OCR ratings, refer to Annex B – Time Current
Curves for further detail on the pre-defined curves for each B_BE MCCB model.