Line-side power components
3.4 Line supply connection via residual-current devices
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SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
Line supply connection via residual-current devices
Selectively tripping, AC/DC-sensitive residual current protection devices (type B) can be
used in addition to the overcurrent protection devices.
Residual-current operated circuit breakers (RCD)
Danger to life due to electric shock when a residual current protection device does not trip
Overcurrent protective devices that do not trip or trip too late can cause an electric shock or
fire.
• Check or activate the residual current circuit breaker in regular cycles.
The following points must be observed when using a residual current circuit breaker:
● It is only permissible to use a type B delayed tripping, selective AC/DC-sensitive residual
current circuit breaker.
● The loop impedance must comply with local installation regulations.
● The maximum total length of the shielded power cables in the drive line-up (motor cables
incl. line supply cables from the line filter to the connecting terminals of the S120 Combi)
may be no more than 175 m.
● Only recommended line filters must be used in operation.
● Switching elements (disconnector unit, contactors) for connecting and disconnecting the
drive line-up have a maximum 35 ms delay time between closing/opening of the
individual main contacts.
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