ANSI C19.3

Description / Abstract: This standard covers the general requirements for all industrial control apparatus, except as modified elsewhere in the C19 Series of American National Standards for Industrial control Apparatus. This standard covers all devices, whether electric, magnetic, mechanical, or electronic (except those intended specifically for marine auxiliaries and propulsion control apparatus, mine locomotive control apparatus, a and railway and railroad locomotion) which, individually or grouped, serve to govern in some predetermined manner the electric power delivered to the apparatus to which they are connected, and which are intended to function on commercial voltages of 750 volts or less, direct current and 5000 volts or less, alternating current.