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Description of function
The following residual-current devices are available, depending on the converter:
• RCD for converters with rated input currents ≤ 80 A based on LO:
Siemens SIQUENCE RCCB (series 5SV364.-4), type B, short-time delayed [K], with a rated
residual current of 300 mA.
The RCCB is connected in series with the overcurrent protection devices.
• RCD for converters with rated input currents ≤ 160 A based on LO:
Residual-current device RCD520B from Siemens (3VA9113-0RL21) mounted on a Siemens
molded-case circuit breaker (series 3VA1).
Recommended settings:
– Response characteristic B
– Residual current trip level 300 mA
– Response delay ≥ 0.06 s
• RCD for converters with rated input currents > 160 A based on LO:
Modular residual-current device from Siemens (MRCD, type B, 5SV8111-4KK) with current
transformer (5SV870.-2K), circuit breaker (series 3VA1) and trip unit (3VA9988-0BL30).
Figure 7-12
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB
Modular residual-current device
7.1 Line system, motor and braking resistor
Connecting
175
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