Kewtech KT64, Инструкция по эксплуатации, Страница: 28 / 44

25
Note:
▲
When the protective device is a residual current device(RCD), Ia is the rated
residual operating current I
Δ
n.
For instance in a TN system with a nominal mains voltage of Uo = 230 V
protected by type gG fuses the Ia and maximum Zs values could be:
Rating Disconnecting Time 5 s Disconnecting Time 0 . 4 s
(A) Ia (A) Zs (
Ω
) Ia (A) Zs (
Ω
)
6 28 8 . 20 47 4 . 90
10 46 5 . 00 82 2 . 80
16 65 3 . 60 110 2 . 10
20 85 2 . 70 147 1 . 56
25 110 2 . 10 183 1 . 25
32 150 1 . 53 275 0 . 83
40 190 1 . 21 320 0 . 72
50 250 0 . 92 470 0 . 49
63 320 0 . 71 550 0 . 42
80 425 0 . 54 840 0 . 27
100 580 0 . 39 1020 0 . 22
If the prospective fault current is measured, its value must be higher than the
Ia value of the protective device concerned.
Fig. 22
LOOP/PSC/PFC