ANSI C37.16
ANS C3716 1988-JAN-01 Swtchgear - Low-Voltage Power Crcut Breakers and AC Power Crcut Protectors - Preferred Ratngs Related Requrements and Applcaton Recommendatons-Tables 89101111A 1214 and 15 Supplement C3716A - 1994 Now Copyrghted by NEMA