Hardware Manual

Technical data 179
The calculated short-circuit current 2.7 kA is higher than the minimum short-circuit
current of the drive gG fuse type OFAF00H160 (1700 A). -> The 500 V gG fuse (ABB
Control OFAF00H160) can be used.
Fuses (UL)
UL class T fuses for branch circuit protection per NEC are listed below. Fast acting
class T or faster fuses are recommended in the USA. Check on the fuse time-
current curve to ensure the operating time of the fuse is below 0.5 seconds for
units of frame sizes R1 to R6 and below 0.1 seconds for units of frame sizes R7
to R9. Obey local regulations.
Note 1: See also Implementing thermal overload and short-circuit protection on page
75.
Note 2: Fuses with higher current rating than the recommended ones must not be
used. Fuses with lower current rating can be used.
Note 3: Fuses from other manufacturers can be used if they meet the ratings and the
melting curve of the fuse does not exceed the melting curve of the fuse mentioned in
the table.
·
(430 V)
2
600 kVA
= 22.19 mohm
Z
k
= z
k
·
U
N
2
S
N
= 0.072
m
·
0.398
ohm
km
= 67.66 mohm
R
c
= 170
m
·
0.082
ohm
km
= 13.94 mohm
X
c
= 170
=
410 V
2 ·
(67.66 mohm)
2
+ (22.19 mohm + 13.94 mohm)
2
I
k2-ph
= 2.7 kA