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Typical protection configurations for various power distribution systems are given below.
TN-C-S, TN-S Network System, 1+1
F1
L
N
PE
F2
i
Back - up fuse
per IEC
Protection against short circuit
L
S1
F1
F1 ≤ 250A gG
F2
F2 not needed
F1
≤ 40A
63A —80A
F2
-
-
2
2
S1
6mm
10mm
S2
2
2
S2
6mm
10mm
Fault Indication
Green
OFF
ON
Dimensions
1.42 [36]
max. 2.7 [70]
TT Network System, 1+1
F1
L
L
N
N
PE
EBB
Isccr = 50kA
Isccr = 25kA
F1 > 250A gG
F1 ≤ 315A gG
F1 > 315A gG
F2 ≤ 250A gG
F2 not needed
F2 ≤ 315A gG
100A — 125A
160A — 200A
>250A
>315A
-
-
≤ 250A
≤ 315A
2
2
2
25mm
25mm
25mm
25 / 35mm
2
2
2
16mm
16mm
16mm
25mm
Green
Unplugged
ON
PH2 / SLOT ¼
39.9 lnf∙in [4.5Nm]
Green: OK
Not Green: Replace Plug
inches
[mm]
L
N
PE
F2
EBB
i
Neutral Conductor
PE Conductor
2
2
Green
Red
OFF
ON
Plug replacement
Remote signalization
A.C.
D.C.
250V / 1A
125V / 1A
48V / 0.5A
RC contact(s) states
SPD modules(s) functional / installation is protected
SPD module(s) unplugged or non-functional /
installation is unprotected
OFF
Step 1:
Unlock
24V / 0.5A
12V / 0.5A
11- 12
11-14
Closed
Open
Open
Closed
Step 2:
Pull module out
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