16
VB 230/400-25
Fusing according to allocation type „1“:
As pre-fuses, we recommend to use line protection fuses (utilization category gL) or automatic
circuit-breakers with tripping characteristic B, C, D or K.
Taking into account the maximum braking currents that occur (normally the nominal/rated device
current), we recommend fuses according to table 2, column 3.
Note:
Wiring cross-sectional area according to DIN VDE 0100-430,
DIN EN 57100-430.
Fusing according to allocation type „2“:
The power semiconductors are to be protected by fuses of the utilization category gR/aR
(semiconductor fuses, high-speed fuses). However, since these fuses do not ensure line
protection, it is necessary to use additionally line protection fuses (utilization category gL/gG).
As for the dimensioning of the line protection fuse (gL/gG), please refer to table 2, column 3.
To protect the semiconductors it is necessary to select gR/aR-fuses featuring cutoff-I²t-values of
the ranges indicated in table 2, column 4. In this connection, the current value of the selected fuse
should not be smaller than the braking current to be expected (nominal/rated device current).
Note 1:
On the basis of the recommended I²t-value, braking current, and possibly the
c.d.f., the fuse supplier is able to select a suitable type. Due to the great
variety of producers, sizes and types, PETER electronic does not
recommend any particular fuses.
Note 2:
If the value of the fuse or cutoff-I²t-value is selected too small, it may happen
that the semiconductor fuse reacts during braking.
Table 2
Fusing according at UL/CSA
Column 1
Column 2
Column 3
Column 4
max. Braking
current /
Nominal/rated
device current
Device type
Fuse value
iallocation type „1“
Recommended range for
cutoff-I²t-value of semiconductor
protection fuses allocation type „2“
25A
VB …-25
20A
500… 900 A²s
Rated device cur-
rent
Device type
Fuse value
prescribed fuse
25A
VB …-25...UL 25A
SIBA aR
Order number 60003305.25
