Siemens 52BAJ Contact Block Brand: Siemens. Part Number: 52BAJ. Siemens Contact Block, Heavy Duty Touch Safe, 30 mm Size, 1NC Contact Configuration, 10 A AC/5A DC at 600 V AC/DC Contact, 1 Contacts, Momentary Action, Push Button Operator, A600/P600 NEMA Rating, Screw Terminal, Threaded Mounting, Glass Filled Nylon, Black. Additional Description: SIEM-52BAJ CLASS 52, CONTACT BLOCK-NC. Catalog Description: Accessory for CL51, CL52, 30mm Contact Block 1 N.C. Contact Meets IEC Standard 947-5-1-3 for Direct Opening Functionality. N.C. Contacts are Positively Driven Heavy Duty NEMA A600/P600 Screw-Terminals Touchsafe Design UL Listed, CSA Certified..