Application guidelines for instantaneous trip circuit breakers in combination motor starters

Author

Gregory, George D. ; Padden, Lorraine K.

Author_Institution

Square D Co., Cedar Rapids, IA, USA

Volume

3

fYear

1997

fDate

5-9 Oct 1997

Firstpage

2252

Abstract

This paper addresses the application of instantaneous trip, molded-case circuit breakers in combination with motor starters. These circuit breakers have been used widely in many industries for motor circuit protection. If not properly applied, situations of false tripping on motor starting and contact welding of contactors under low level faults may occur. High efficiency motors compound the issue of false tripping on motor starting. This paper discusses the components of combination starters, reviews testing requirements and provides examples of coordination with an analysis of application issues and solution options

Keywords

circuit breakers; machine testing; motor protection; starting; switchgear testing; application guidelines; false tripping; instantaneous trip circuit breakers; motor circuit protection; motor starters; testing requirements; Circuit breakers; Circuit faults; Circuit testing; Contactors; Guidelines; National electric code; Protection; Switches; Switching circuits; Welding;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE

Conference_Location

New Orleans, LA

ISSN

0197-2618

Print_ISBN

0-7803-4067-1

Type

conf

DOI

10.1109/IAS.1997.626378

Filename

626378