6ES7590-1AF30-0AA0 SIMATIC S7-1500, mounting rail 530 mm (approx. 20.9 inch); incl. grounding screw, integrated DIN rail for mounting of incidentals such as terminals, automatic circuit breakers and relays
simatic s7-1500, mounting rail 245 mm (appr. 9.6 inch); incl. grounding element, integrated din rail for mounting of small components such as clamps, fuses or relays