Revision Standard - Inactive - Superseded.This IEEE Standards product is part of the C37 family on Switchgear, Substations and Protective Relays. This standard covers enclosed low-voltage AC power circuit breakers of the stationary or draw-out type of two- or three-pole construction, with one or more rated maximum voltages of 635 V (600 V for units incorporating fuses), 508 V, and 254 V for application on systems having nominal voltages of 600 V, 480 V, and 240 V; with unfused or fused circuit breakers; manually or power operated; and with or without electromechanical or solid-state trip devices. It deals with service conditions, ratings, functional components, temperature limitations and classifications of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application. You will receive an email from Customer Service with the URL needed to access this publication online.