NHP TemBreak PRO - Long Time Delay Protection (LTD); Adjusting Ir (Current)

Protection Settings
29
TemBreak PRO B_BE-UM-001-EN  V1.1.0
Long Time Delay Protection (LTD)
The Long Time Delay protection protects against current overloads or surges in power distribution or motor control applications.
Long Time Delay protection is an inverse-time protection which includes a thermal image function.
Adjusting I
r
(Current)
The LTD protection trip range is: 1.05...1.20 x I
r
according to standard AS/NZS IEC 60947.2.
The trip threshold tolerance I
r
for the long-time delay protection is +5% to +20%.
The I
r
threshold is set using the I
R
adjustment dial in step increments.
I
r
settings (A)
Rating (I
n
)
I
R
Dial position
1
2
3
4
5
6
7
8
9
10
40A
16
20
25
32
36
38
40
125A
50
62
78
100
112
118
125
160A
64
80
100
128
144
152
160
250A
100
125
157
200
225
237
250
400A
160
200
252
320
340
360
400
630A
250
315
395
440
470
505
535
565
600
630
800A
320
400
505
560
600
640
680
720
760
800
1000A
400
500
630
700
750
800
850
900
950
1000
1250A
500
630
790
875
940
1000
1060
1125
1190
1250
1600A
640
800
1000
1120
1200
1280
1360
1440
1550
1600
Long Time Delay Settings
Description
L
I
r
Long Time Delay protection threshold (current rating)
t
r
Long Time Delay (time delay)
Notice: For B250 / 400 models, the I
R
dial adjusts in increments of percentage (%) values of I
n
:
I
R
= 40, 50, 63, 80, 85, 90, 95, 100% x I
n