ABB PQFM Instruction Manual page 51

an appropriate protection mechanism that protects both the feeding cable and the filter
unit. As a protection mechanism it is recommended to use fuses of type gG/gL with the
RMS current ratings given in
Filter nominal current rating
(Arms)
70
100
130
150
Voltage rating and short circuit current handling capability should be in accordance with
the network characteristics.
As an alternative to fuse protection, MCCB protection of appropriate sizing can also be
used. When the customer protection is in place, the following PQFM input protection
will result.
L1
L2
L3
Figure 29: Symbolic representation of the PQFM input protection (CE version)
In case the optional internal fuse protection is installed, the internal fuses have the
following characteristics:
.
Table 20
Table 20: RMS current ratings for protection fuses
Minimum fuse protection
(Arms)
90
130
160
200
Customer added protection
To PQFM
power stage
Manual Power Quality Filter PQFM ç Electrical design and installation 51
Maximum fuse protection
(Arms)
160
160
200
200
2.5mm² reinforced
6A (10X38 for up to 480V)
To PQFM
control circuit
To surge arrester
(optional)
PQFM filter unit