Siemens 3LD9200-5CF Sentron Auxiliary Switch Brand: Siemens. Part Number: 3LD9200-5CF. Siemens Sentron™ Auxiliary Switch, 1-Pole, 25 to 250 A, 1NO-1NC Contacts, For Use With: 3LD2 OEM Disconnect Main, Emergency Switching Off Switch, Surface Mounting, Plastic. Additional Description: SIEM-3LD9200-5CF (N) AUX CONTACT 1NO 1NC GOLD PL BASE NON-CANCELABLE, NON-RETURNABLE. Catalog Description: AUX CONTACT 1NO 1NC GOLD PL BASE AUXIL. SWITCH 1NO+1NC WITH GOLD-PLATED CONTACTS ATTACHABLE LEFT AND OR RIGHT DELAYED SWITCH-ON - NEW DESIGN -..