Siemens SINAMICS G12 Hardware Installation Manual page 49

● 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
Further protection and monitoring equipment
view/109486009)
Power Module PM240-2
Hardware Installation Manual, 08/2017, A5E33294624B AG
MRCD
Length of the motor cable (Page 59)
PE
(https://support.industry.siemens.com/cs/ww/en/
Connecting-up
49