Datasheet

cex-EP3
136
selection charts
n How to select a protection system ?
Depending on the type of failure, overload or short-circuit, use 2 series
of data
① Overloads: use the operating zone curves of the different protection
devices. On the same row, the operating zones should not overlap
② Short-circuits: use the ∫i
2
t tables. The total ∫i
2
t of the protection
system the furthest downstream must be less than the upstream
protection pre-arc ∫i
2
t
n Motor protection
n Example of good selection
n Selection between cartridge fuses (according to IEC 60269-2-1)
Upstream
Downstream
rating
maximum rating determined according to class
gG cartridge fuse
and voltage to obtain selection
(A)
aM gG
2
4 1 1
6 2 2
8 2 2
10 2 4
12 2 4
16 4 6
20 6 10
25 8 16
32 10 20
35 12 20
40 12 25
50 16 32
63 20 40
80 25 50
100 36 63
125 40 80
160 63 100
200 80 125
250 125 160
315 125 200
400 160 250
500 200 315
630 250 400
800 315 500
1000 400 630
1250 500 800
Upstream
Downstream
rating
maximum rating determined according to class
aM cartridge fuse
and voltage to obtain selection
(A)
aM gG
2 1 1
4 2 4
6 2 6
8 4 8
10 6 10
12 6 12
16 10 16
20 12 20
25 12 25
32 20 32
36 20 32
40 25 32
50 25 40
63 40 50
80 50 63
100 63 80
125 80 100
160 100 125
200 125 160
250 160 160
315 200 200
400 250 250
500 315 315
630 400 400
800 500 500
1000 630 500
1250 800 630
(1) 400 V max.
C.T. pre-arc
upstream
downstream
C.T. arc 230 V cos = 0.1
C.T. arc 500 V cos = 0.1
cartridge
upstream
cartridge
downstream
∫i
2
dt
in A
2
sec.
C.T. pre-arc
upstream
downstream
C.T. arc 230 V cos = 0.1
C.T. arc 500 V cos = 0.1
cartridge
upstream
cartridge
downstream
Motor three-phase Cartridges
230 V 400 V 500 V 10 x 38 14 x 51 22 x 58 S. 00 S. 0 S. 1 S. 2 S. 3 S. 4
ratings ratings ratings ratings ratings ratings ratings ratings ratings
kW Hp In A kW Hp In A kW Hp In A gG aM gG aM gG aM gG aM gG aM gG aM gG aM gG aM gG aM
0.37 0.5 1.03 0.75 1 1.5 4 2 4 2
0.37 0.5 1.8 0.75 1 2 1.5 2 2.6 6 4 6 4
0.75 1 3.5 1.5 2 3.5 2.2 3 3.8 8 4 8 4
1.1 1.5 4.4 2.2 3 5 3.7 5 5.9 12 6 12 6
1.8 2.5 7 3 4 6.6 4 5.5 6.5 16 8 16 8 16
2.2 3 8.7 4 5.5 8.5 5.5 7.5 9 20 10 20 10 20
3 4 11.5 5.5 7.5 11.5 7.5 10 12 25 12 25 12 25 25
4 5.5 14.3 7.5 10 15.5 11 15 18.4 20
(1)
32 20 32 20 32 20
5.5 7.5 20 11 15 22 15 20 23 20
(1)
50 25 50 25 50 25
7.5 10 27 15 20 30 18.5 25 28.5 32 50 32 50 32
10 13.5 35 18.5 25 37 25 34 39.4 40 63 40 63 40 63
11 15 39 22 30 44 30 40 45 50
(1)
80 50 80 50 80
15 20 52 25 34 51 40 54 60 100 63 100 63 100 63
18.5 25 64 30 40 60 45 60 65 80 125 80 125 80 125
22 30 75 37 50 72 51 70 75 80 125 80 125 80 125
25 35 85 45 60 85 63 109 89 100 160 100 160 100 160
30 40 103 55 75 105 80 110 112 125
(1)
125 200 125 200 125 200
45 60 147 75 100 138 110 150 156 160 250 160 250
55 75 182 90 125 170 132 180 187 200 315 200
75 100 239 110 150 205 160 220 220 250 400 250
80 160 260 132 180 245 220 300 310 315
90 125 295 160 218 300 315
110 150 356 200 270 370 250 340 360 400
132 180 425 250 340 475 335 450 472 500
160 218 520 315 430 584 450 610 608 630
220 300 710 400 550 750 500 680 680 800