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DPX
®
250 ER
Fixed magnetic threshold (Im) (A) for DPX 250 ER
Nominal breaking capacity (kA) (BS EN 60947-2)
DPX 250 ER 25 kA
Ue
Icu (kA) Ics (%Icu)
400 V
±
25 100
230 V
±
40 100
n
Electrical characteristics
Maximum nominal operating function
500 V
±
- 250 V
=
Nominal frequency
50/60 Hz
Category of use
A
Thermal adjustment
0·64 to 1 In
Maximum permitted cross sections
stranded cables : 185 mm
2
via optional cage terminals
flexible cables : 150 mm
2
copper bar (width) : 22 mm (M8)
Nominal current (In) at 40 °C (A) for DPX 250 ER
In (A)
100
160
250
Phase
100
160
250
N
100
160
250
N/2
–
100
160
In (A)
100
160
250
Phase
1 000
1 600
2 500
N
1 000
1 600
2 500
N/2
–
1 000
1 600
n
Tripping curves
at ambient
θ
= 40 °C
I = actual current
Ir = max. adjustment current of thermal release
➀
= thermal release zone when cold
➁
= thermal release zone when hot (in steady state)
n
Thermal stress limitation curves
Icc = prospective short-circuit symmetrical current
(rms values in A)
I
2
t = limited thermal stress (in A
2
s)
n
Differential tripping curves
I
∆
(A) = earth leakage current
I
∆
n = nominal earth leakage current
a = instantaneous tripping point
b = 3 possible delay settings (0·3, 1 and 3 seconds)
n
Current limitation curves
Icc = prospective short-circuit symmetrical current
(rms values in kA)
IP = maximum peak value (kA)
➀
= current, max. peak, short-circuit rms
➁
= current, unlimited peak (max.), corresponding to power factors shown above (0·2 to 0·9)
026002-34795u.eps
In 3 A
In 1 A
In 0 . 3 A
b
a
0 . 01
0 . 01
0 . 02
0 . 05
0 . 1
0 . 2
0 . 5
1
2
t (s)
5
10
0 . 05 0 . 1 0 . 5 1
5 10 50 100 300
I (A)
In 0 . 03 A
025253-51588u.eps
250
160
100
Icc (A)
10
0
10
1
10
2
10
3
10
4
10
5
10
10
10
9
10
8
10
7
10
6
10
5
10
4
10
3
10
2
10
1
t
(
A
2
s I
2
)
025253-51587u.eps
0 . 9
0 . 8
0 . 7
0 . 5
0 . 3
0 . 25
0 . 2
Icc(kA)
10
0
10
10
1
10
2
10
3
2 3 4 5
2 3 4 5
10
1
10
2
2
3
4
5
2
3
4
5
2
3
4
5
IP (kA)
100 - 250 A
0
2
1
DPX 250 ER 25 kA
10000
1000
100
10
1
0 . 01
0 . 001
0 . 1
t(s)
1
3 2
4 5
10 20 30 50 100
I/In
1
2
025521-15142u.eps
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