Siemens SINAMICS G120 Hardware Installation Manual page 39

● For inverters with rated input currents> 125 A referred to LO, use a type B MRCD (for
example, from the Bender company).
An MRCD comprises an RCM (differential current monitoring device), a measuring current
transducer and a circuit breaker with additional undervoltage release, listed in the Technical
data. An example of an MRCD design is provided in the following diagram.
Figure 5-1
● A dedicated RCD is used for every inverter.
● The motor cables are shorter than 50 m (164 ft) shielded, or 100 m (328 ft) unshielded.
Additional information about motor cables
PM240P-2 Power Modules
Hardware Installation Manual, 11/2016, A5E37800827C AB
MRCD
Length of motor cable (Page 47)
PE
Connecting-up
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