ABB PQFS User Manual

Manual Power Quality Filter PQFS  Electrical design and installation 43
Table 21: RMS current ratings for protection fuses
Filter nominal current rating
(Arms)
Minimum fuse protection
(Arms)
Maximum fuse protection
(Arms)
30 40 125
45
63
125
60
80
125
70 100 160
80 100 160
90 125 160
100
125
160
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
To PQFS
power stage
To PQFS control circuit and
DC bus loading circuit
2.5mm² reinforced
6A (10X38 for up to
415V)
N
Customer added protection
PQFS filter unit
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.

ABB PQFS Specifications

General

Brand	ABB
Model	PQFS
Category	Industrial Electrical
Language	English