BS 5311-3 1976 Edition, August 31, 1976
Specification for a.c. circuit-breakers of rated voltage above 1 kV. Design and construction
Includes all amendments and changes through Change/Amendment , August 31, 1976
Additional Comments: W/D S/S BY BS 5311
Published By:British Standards Institution (BSI)
Requirements for liquids and gases in circuit-breakers, simultaneity of poles, auxiliary equipment, operation, closing, releases, interlocking devices, vent outlets and rating plates.