ABB PQFS Installation, Operation And Maintenance Instructions page 43

Filter nominal current rating
(Arms)
30
45
60
70
80
90
100
Voltage rating of the fuses should be in accordance with the network voltage.
As an alternative to fuse protection, MCCB protection of appropriate sizing can also be
used. When the customer protection is in place, the following PQFS input protection will
result.
L1
L2
L3
N
To PQFS
power stage
Note: neutral connection only needed for 4-wire connection
Figure 26: Symbolic representation of the PQFS input protection
The active filter power circuit is internally connected to the network by means of a main
contactor of type ABB UA50 or UA95 (depending on the current rating).
The PQFS control circuit and DC bus preload system is protected by a fuse protection
scheme, the characteristics of which are given in the table below.
Table 21: RMS current ratings for protection fuses
Minimum fuse protection
(Arms)
40
63
80
100
100
125
125
Customer added protection
To PQFS control circuit and
DC bus loading circuit
Manual Power Quality Filter PQFS  Electrical design and installation 43
Maximum fuse protection
(Arms)
125
125
125
160
160
160
160
2.5mm² reinforced
6A (10X38 for up to
415V)
PQFS filter unit