KYORITSU 6050 - Page 18

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Note:
● Foradistributioncircuitadisconnectiontimenotexceeding5sis
permitted.
● Whenthe protective device is a residual current device (RCD),la is the
ratedresidualoperatingcurrentI⊿n.
ForinstanceinaTNsystemwithanominalvoltageofUo=230Vprotected
bytypegGfusesthelaandmaximumZsvaluescouldbe:
6
10
16
20
25
32
40
50
63
80
100
Ia(A)
28
46
65
85
110
150
190
250
320
425
580
Zs(Ω)
8.2
5
3.6
2.7
2.1
1.53
1.21
0.92
0.71
0.54
0.39
Ia(A)
47
82
110
147
183
275
320
470
550
840
1020
Zs(Ω)
4.9
2.8
2.1
1.56
1.25
0.83
0.72
0.49
0.42
0.27
0.22
Rating
(A)
Disconnectingtime5s Disconnectingtime0.4s
Iftheprospectivefaultcurrentismeasured,itsvaluemustbehigherthanthe
lavalueoftheprotectivedeviceconcerned.