6ES7 392-1AM00-0AA0 Siemens S7-300,FRONT CONNECTOR WITH SCREW CONTACTS, 40-PIN
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6ES7 392-1BM01-0AA0 Siemens S7-300, FRONT CONNECTOR WITH SPRING CONTACTS, 40-PIN
Simatic s7-300 front connector for signal modules with spring contacts 40-pin
6ES7 392-1AJ00-0AA0 Siemens S7-300, FRONT CONNECTOR WITH 20PIN (SCREW)
SIMATIC S7-300 PLC Front connector for signal modules with screw contacts WITH 20-pole