Siemens 6ES7973-1GC00-0AA0 Industrial Automation Module — Legacy Replacement. Siemens 6ES7973-1GC00-0AA0 is the exact manufacturer order number for a industrial automation module in the SIMATIC S7-300 Connection System portfolio. Siemens describes this exact reference as: *** spare part *** SIMATIC S7-300, fuse kit 6.3 A; for SM 322 6ES7322-1CF00-0AA0 10 units per packing unit. The verified manufacturer lifecycle record is PM410:Product cancellation.