Full Description
Scope
This standard provides requirements for low-voltage (600 V ac and below) definite-purpose switching (LVDPS) devices (other than power circuit breakers) for use in metal-enclosed low-voltage power circuit breaker switchgear described in IEEE Std C37.20.1(TM). These switching devices may be used in motor control or other repetitive duty applications and have the following characteristics: a) Drawout type, three-pole construction; b) Integral current-limiting fuses for short-circuit protection; c) Power operated, with integral or separately mounted overcurrent protective devices; In this standard, the term LV-DPS device denotes a low-voltage definite-purpose switching device conforming to the requirements of this standard.Purpose
This standard provides guidance in evaluating switching devices (other than low-voltage power circuit breakers conforming to IEEE Std C37.13(TM)) that are intended to be applied in metal-enclosed low-voltage power circuit breaker switchgear.Abstract
Revision Standard - Active.Definite-purpose switching devices for use in metal-enclosed low-voltage power circuit breaker switchgear are covered in this standard. The switching devices are fused, drawout type, three-pole construction, with one or more rated maximum ac voltages of 600 V, 508 V, and 254 V for application on systems having nominal ac voltages of 600 V, 480 V, and 240 V. The switching devices are power operated with integral or separately mounted overcurrent protective devices. Service conditions, ratings, functional components, temperature limitations and classifications of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application are addressed in this standard. The switching devices are normally used in applications that require frequency of operation greater than normal operations expected of low-voltage power circuit breakers.
