Siemens SINAMICS S120 Combi - Overvoltage Protection

Line-side power components
2.5 Overvoltage protection
SINAMICS S120 Combi
34 Manual, Edition 07/2012, 6SL3097-4AV00-0BP3
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Figure 2-3 Connecting a residual-current operated circuit breaker
Recommendation
SIEMENS selectively switching AC/DC-sensitive residual-current circuit breakers in
accordance with EN 61009-1 of the 5SM series (e.g. 5SM3646-4 or 5SM3646-4+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")).
NOTICE
AC or pulse-sensitive RCCBs are not suitable.
2.5 Overvoltage protection
To protect the units against line-side surge voltages, you are advised to install an
overvoltage protection device directly at the infeed point (upstream of the main switch). To
fulfill the requirements of CSA C22.2 no. 14-05, surge protection is essential. The Raycap
company has suitable surge arresters.