Title: Electrical circuit breakers

Abstract: An electrical circuit breaker having a thermal element which on being heated by fault current trips the breaker, and including an adjustable member to vary the action of the thermal element thereby to vary the rating of the breaker, said adjustable member comprising a slide displaceable by an eccentric boss rotatable by means of an external knob.

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Inventors: Kidd, Alan Lister (Southport, EN)
Eaves, Douglas (Blackpool, EN)
Walmsley, Keith (Preston, EN)

Application Number: 505223
Filing Date: 1974-09-12
Publication_date: 1976-03-09
Assignee: Dorman Smith Switchgear Limited (Preston, EN)
Primary Class(es): 337/57 74/553, 200/336, 335/45, 337/82
Other Classes:
US Patent Ref:

3084236	Apr, 1963	Klein et al.	335/10.
3142187	Jul, 1964	Kane et al.	74/553.
3211861	Oct, 1965	Freese	337/82.
3226510	Dec, 1965	Thomas et al.	337/57.
3708771	Jan, 1973	Schreckenberg et al.	337/82.
3775713	Nov, 1973	Walker et al.	335/176.

Other Refs:
Primary Examiner: Broome, Harold
Assistant Examiner:
Attorney: Ross, Ross & Flavin