Siemens SINAMICS S120 Manual page 54

Line connection and line-side power components
3.4 Line supply connection via residual-current devices
● If you connect residual-current devices in series, then they must all have the same
characteristics.
● Ensure that the switching elements (disconnector unit, contactors) for connecting and
disconnecting the drive system have max. 35 ms delay time between the closing/opening
of the individual main contacts.
Figure 3-3
Recommendation
SIEMENS selectively switching AC/DC-sensitive residual-current circuit-breakers according
to EN 61009-1 of the 5SM series (e.g. 5SM3646-5 or 5SM3646-5+5SW3300 with an
auxiliary disconnector (1 NC contact / 1 NO contact) for a rated current of 63 A and rated
fault current of 0.3 A (see Catalog "BETA Modular Installation Devices - ET B1")).
Note
AC or pulse-sensitive RCCBs are not suitable.
54
Connection of a residual-current protective device
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8