Schaffner Group
User and Installation Manual
Ecosine
max
60/66
8.3.9 Fuses
Ecosine max passive harmonic filters need external over-current protection for compliance with
UL/cUL standard. Fuses and associated fuse holders must be UL listed and rated for 100kA SCCR
supplies. Table 30 and Table 31 show requested fuse current ratings for UL class J/L and, where UL
compliance is not mandatory, for IEC class gG. The fuse rating is independent of the supply voltage.
A system with multiple ecosine max fil-
ters paralleled for a higher power load
need each a separate 3-phase line side
fuse block, corresponding to the re-
spective filter and according to Table 30
and Table 31.
The drive’s application manual may
prescribe line-side fuse protection as
well, which in this case either corre-
sponds to the sum of the filter fuse rat-
ings or, if lower, would request separate
drive fuses at its input.
An application, having one ecosine fil-
tering harmonics for several drives, re-
quires in any case line side fuse protec-
tion of the drives as well as the correct
filter protection according to Table 30
and Table 31 and section 8.3.5.
fuse
fuse
ecosine 1
ecosine 2
drive
M
fuse
ecosine
drive
M
fuse
drive
M
fuse
drive
M
fuse
