Siemens 3LD9200-5C Disconnect Switch. Sentron™ Auxiliary Switch Series: 3LD 690 VAC 25 to 250 A 1 Pole 1NO-1NC Contact Form Base/Floor Mounting -20 to 120 deg F 50 mm L x 11 mm W x 32 mm H Dimensions. Additional Description: SIEM-3LD9200-5C 3LD2 SWITCH ACC 1NO 1NC AUX BASE. Catalog Description: 3LD2 SWITCH ACC 1NO 1NC AUX BASE -NEW DESIGN - (ZUBEHOER FUER SCHALTER 3LDX) FOR BASE MOUNTING UP TO 32 A AUXIL. SWITCH 1NO+1NC.