NHP TemBreak PRO, User Manual

Page: 28 / 105

Protection Settings
28
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.