Title :
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
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;
Conference_Titel :
Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-4067-1
DOI :
10.1109/IAS.1997.626378
