Peter electronic VB 230-25 L, Assembly And Commissioning Instructions

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18 VB230/400-6/25/30L (LP)
Fusing according to allocation type „2“:
The power semiconductors are to be protected by fuses of the utilization category gR (semicon-
ductor 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).
As for the dimensioning of the line protection fuse (gL), please refer to table 2, column 3.
To protect the semiconductors it is necessary to select gR-fuses featuring cutoff-I²t-values of the
ranges indicated in table 2, column 4. In this connection, the fuse rating of the selected fuse
should not be smaller than the braking current to be expected (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 fuse or cutoff-I²t-value is selected too small, it may happen that the
semiconductor fuse reacts during braking.
Table 2
Column 1 Column 2 Column 3 Column 4
max. Braking
current / Rated
device current
Device type Fuse value
in the case of
allocation type 1
Recommended range for
cutoff-I²t-value of semiconductor
protection fuses in the case of
allocation type „2“
6A VB …-6L
(LP) 6A 150… 250 A²s
25A VB …-25L
(LP) 20A 500… 900 A²s
30A VB …-30L
(LP) 25A 600… 900 A²s