Siemens VT400 Instructions De Service page 10

Operating Instructions
Rated current Rated
of frame size current
I I
mn n
250 A
400 A 315 A
400 A
(21) Tripping characteristic curve for VT400
(22) Protective curve of ETU (electronic trip unit)
I
10
I , current settings of long-
r
time delay protection 40 °C
A/B/C phase N pole
175 ~ 250 A 175 ~ 250 A
220.5 ~ 315 A 220.5 ~ 315 A
280 ~ 400 A 280 ~ 400 A
2
t ON
Instantaneous short-circuit protection I
For power distribu-
For motor protection
tion protection
A/B/C phase N pole A/B/C phase
2500 A 2500 A
3150 A 3150 A
4000 A 4000 A
2
I
i
N pole
3000 A 3000 A
3780 A 3780 A
4800 A 4800 A
t OFF
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