Title :
Short circuit protection of low voltage motor branch circuits, by HRC II-C fuses
Author_Institution :
GEC Alsthom Int. Equipment Ltd., Liverpool, UK
Abstract :
It is pointed out that HRCII-C fuses meeting CSA Specification C22.2 no.106-M 1985 and complying with the requirements for type gG fuses of IEC269-1986 provide proven backup protection to IEC rated contactors and motor starters, ensuring Type 2 coordination and enabling their motor starting capabilities to be fully utilized. HRCII-C fuses provide lower power losses than the HRCI-J fuses for the same application, which is a significant factor in modern compact motor control centers. It is further noted that the pending revision of C22.2 no.106 will rectify a weakness in the 1985 edition by recognizing the fact that the HRCII-C fuses can meet let through limits significantly less than those indicated in that edition.<>
Keywords :
electric fuses; electric motors; machine protection; short-circuit currents; CSA Specification C22.2 no.106-M 1985; HRC II-C fuses; IEC rated contactors; IEC269-1986; Type 2 coordination; low voltage motor branch circuits; motor starters; short-circuit protection; type gG fuses; Circuits; Contactors; Delay effects; Electric variables; Fuses; IEC standards; Low voltage; Manufacturing; Protection; Standards publication;
Conference_Titel :
Pulp and Paper Industry Technical Conference, 1991., Conference Record of 1991 Annual
Conference_Location :
Montreal, Quebec, Canada
DOI :
10.1109/PAPCON.1991.239641
