07
Table 4 Model and melt current of the backup fuse of starter
3.4
Coordination of protection
If the short-circuit current is not bigger than the rated ultimate short
circuit breaking capacity of the starter, the protection should be provided by
the starter; if the short circuit current is bigger than the rated ultimate
short-circuit breaking capacity of the starter, the protection should be
provided by the fuse or circuit breaker. See Table 4 for model and melt
current of the backup fuse of starter.
1
2
3
4
25
40
63
80
16
-
25
25
-
40
40
-
63
56
-
80
250
250
315
315
315
315
400
400
No.
Rated
current
In A
Rated operating
current (adjustment
range of thermal
element setting
current)
Melt current
(backup fuse is only needed when Isc
＞
Icu)
400/415V
aM A
gL/gG a
Maintenance
4
Clean the dust on the motor starter timely. Conduct product test and
maintenance every half a year to ensure the smooth operation of the
product and the good contact of NO and NC contacts. Tighten the terminal
screws with specified torque and align the load protection capability of the
motor starter according to commissioning requirements.
Be careful when handling and installing the starter. It is prohibited to
move the product by crane with strong impact so that the product will not
be damaged and its protection characteristics will not change.
