Siemens SINAMICS S120 Equipment Manual page 112

Line Connection Booksize
2.13 Line connection variants
Fuses
For timely tripping of fuses, the loop resistance as well as the vector group of the line supply
transformer being fed must satisfy the requirement that the touch voltage of the devices is
switched off by the provided fuses within the permissible tripping time (see figure below, in
accordance with EN 61800-5-1 Ed. 2).
10 000
1000
100
10
10
Figure 2-43 Permissible tripping time of fuses
The boundary conditions indicated above also serve to avoid a fire in case of a fault. If you
do not comply with these boundary conditions, you must take additional measures, e.g.,
residual current transformer.
Fuse and plant conditions such as loop resistance and short-circuit power must be
harmonized to one another so that the limit curve is not exceeded. This guarantees the
shock-hazard protection.
112
AC -2 AC -2
25 V AC 30 V AC
DC-2
60 V DC
AC -2
100
250 V
Equipment Manual, (GH2), 07/2007, 6SL3097-2AC00-0BP5
DC-2
1000
Booksize Power Units