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ANSI C37.16


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Low-Voltage Power Circuit Breakers and AC Power Circuit Protectors Preferred Ratings, Related Requirements, and Application Recommendations

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This standard has been revised to include a 5000 Ampere frame size in tables 1 through 5 and tables 22A and 22B for low-voltage AC power circuit breakers. In addition, both 1000 volt and 1200 volt ratings for DC breakers in tables 11, 11a, and 12 are now included, since both ratings of breakers are now available. The titles of tables 11 and 12 have been clarified to differentiate between “heavy duty” and “light duty” applications.

The 1997 version was revised to reflect industry trends such as deleting the 225 ampere frame size throughout since it is not utilized any longer; adding a 2000 ampere frame size fused circuit breaker (Tables 17 and 19, Line 4) which is now available; incorporating the C37.16a-1994 DC circuit breaker Tables 8, 9, 10, 11, 11A and 12, which correlated with C37.14-1992; and incorporating the electronic trip device ratings.

This standard was first published by the American Standards Association (now the American National Standards Institute) in 1956, using material developed by the National Electrical Manufacturers Association (NEMA).

Reference should be made to the appropriate American National Standards for service conditions, definitions, ratings, temperature limitations, classes of insulating material, nameplate markings, dielectricwithstand requirements, test requirements, and application standards.

American National Standards are subject to periodic review. Users are cautioned to secure the latest edition. Suggestions for improvement of this standard will be welcome. They should be sent to the National Electrical Manufacturers Association, 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209.


This standard applies to all low-voltage power circuit breakers and AC power circuit protectors as covered in the following American National Standards (see Section 4):

ANSI/IEEE C37.13-1990 (R1995), American National Standard for Low-Voltage AC Power Circuit Breakers Used in Enclosures

ANSI/IEEE C37.14-1999, American National Standard for Low-Voltage DC Power Circuit Breakers Used in Enclosures.

ANSI C37.17-1997, American National Standard for Trip Devices for AC and General Purpose DC Low- Voltage Power Circuit Breakers

ANSI/IEEE C37.18-1979 (R1997), American National Standard Requirements for Field Discharge Circuit Breakers for Rotating Electric Machinery

ANSI/IEEE C37.29-1981 (R1990), American National Standard for Low-Voltage AC Power Circuit Protectors Used in Enclosures

ANSI C37.50-1989 (R2000), American National Standard Test Procedures for Low-Voltage AC Power Circuit Breakers Used in Enclosures

ANSI C37.52-1974 (R2000), American National Standard Test Procedures for Low-Voltage AC Power Circuit Protectors Used in Enclosures