Low-Voltage AC Power Circuit Breakers. Low-voltage ac power circuit breakers (not molded-case breakers) with interrupting ratings of over 10,000 amp (amperes), 1,000 volts ac or less, covered by American Standards C37.13-1963, C37.151954 (Reaffirmed 1961) , C37.16-1963, and C37.171962. Individually Enclosed Low-Voltage AC Power Circuit Breakers. Low-voltage ac power circuit breakers, when in individual enclosures, usually built of steel for separate mounting. Low-Voltage AC Power Switchgear Assemblies. Low-voltage ac power switchgear assemblies, indoor and outdoor, including low-voltage ac power circuit breakers 1,000 volts ac or less, either drawout or stationary, covered by American Standard C37.20-1955.

This standard covers the following equipment. 19-1.1 Low-Voltage AC Power Circuit Breakers. Low-voltage ac power circuit breakers (not molded-case breakers) with interrupting ratings of over 10,000 amp (amperes), 1,000 volts ac or less, covered by American Standards C37.13-1963, C37.15- 1954 (Reaffirmed 1961), C37.16-1963, and C37.17- 1962. 19-1.2 Individually Enclosed Low-Voltage AC Power Circuit Breakers. Low-voltage ac power circuit breakers included in 19-1.1, when in individual enclosures, usually built of steel for separate mounting. 19-1.3 Low-Voltage AC Power Switchgear Assemblies. Low-voltage ac power switchgear assemblies, indoor and outdoor, including low-voltage ac power circuit breakers 1,000 volts ac or less, either drawout or stationary, covered by American Standard C37.20-1955