Power Supply Capacity; Recommended Fuses - WEG SSW-08 Manual Del Usuario

3.2.4.1 Power Supply Capacity

The Soft-Starter SSW-08 is suitable to be used in a circuit capable of supplying not more than X
(according to table 3.6) symmetrical rms amperes, Y maximum volts when protected by ultra-rapid
fuses.
The SSW-08 can be installed on power supplies with a higher fault level, if it is protected by
ultra-rapid fuses with an adequate interrupting current and an I

3.2.4.2 Recommended Fuses

The fuses to be used on the input must be high speed semiconductor fuses with l
to 75 % of the SCR value indicated in table 3.7 (A
be equal or greater than the motor starting current to avoid cyclic overloads and fuse opening
in the forbidden region of the Time x Current curve. These fuses will protect the SSW-08 in case
of a short-circuit.
Normal fuses can also be used, instead of the high speed, which will protect the installation from
short-circuits, but the SSW-08 will not be protected.
For the electronic supply protection of the SSW-08 must be used fuse type D, or circuit breaker
type C as specified in table 3.7.
Table 3.6: Maximum current capacity of the Power supply
SSW-08
Model
17 A
24 A
30 A
45 A
61 A
85 A
130 A
171 A
200 A
255 A
312 A
365 A
412 A
Installation and Connection
Y = 220-575 V
X (kA)
5
5
5
5
5
10
10
10
10
25
25
25
25
t according to item 3.2.4.2.
2
s), the fuse rated current should preferably
2
3
t lower or equal
2
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