Siemens – 7SS5220-4AB91-1AA0 L0R
 DISTRIBUTED BUSBAR/ CIRCUIT BREAKER FAILURE PROTECT. 7SS52 CENTRAL UNIT, 50/60HZ, FIRMWARE VERSION: V4 RATED AUXILIARY VOLTAGE: DC 110V TO 125V in rack SIPAC region world, language English (language can be changed) IEC 61850, 100 Mbit Ethernet electrical,double,RJ45 plug service interface: DIGSI 4, electrical RS232 without supplementary function assembly for 8 bays