KYORITSU KEW 6016 Instruction Manual page 33

Protection by gG fuses
Disconnection
time 5s
Rating
(A)
Ia
(A)
6 17
10 31
16 55
20 79
25 100
32 125
40 170
50 221
63 280
80 403
100 548
The most complete loop testers or Multifunction testers also have the Prospective Fault
current measurement. In this case, Prospective Fault current measured with instruments
must be higher than the tabulated Ia of the protective device concerned.
Below is a practical example of verification of the protection by MCB in a TN system
according to the international Standard IEC 60364.
with Uo of 230V
Disconnection
time 0.4s
Zs Ia
(A)
()
13.5 38
7.42 45
4.18 85
2.91 130
2.3 160
1.84 221
1.35 --
1.04 --
0.82 --
0.57 --
0.42 --
L-PE
ATT :ON
Fig.25
Protection by MCBs with Uo of 230V
(Disconnection time 0.4 and 5s)
Characteris
tic
B
Zs Ia Zs
(A)
() ()
8.52 30 7.67
5.11 50 4.6
2.7 80 2.87
1.77 100 2.3
1.44 125 1.84
1.04 160 1.44
-- 200 1.15
-- 250 0.92
-- 315 0.73
--
--
Ω
230
V
50.0Hz
L-PE
L-N
!
30
Characteris Characteristi
tic
C
Ia Zs Ia
(A) (A)
()
60 3.83 120
100 2.3 200
160 1.44 320
200 1.15 400
250 0.92 500
320 0.72 640
400 0.57 800
500 0.46 1000
630 0.36 1260
c
D
Zs
()
1.92
1.15
0.72
0.57
0.46
0.36
0.29
0.23
0.18