| Replaces |
BS 3939 Section 30:1978, BS 3939:Introduction:1966, BS 3939 Section 27:1972, BS 3939 Section 24:1970, BS 3939 Section 26:1970, BS 3939 Section 28:1972, BS 3939:Guiding principles:1970, BS 3939 Section 20:1968, BS 3939 Section 23:1978, BS 3939 Section 22:1971, BS 3939 Section 29:1978, BS 3939 Section 9:1967, BS 3939 Section 25:1970
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| Descriptors |
Electric starters, Measuring relays, Graphic representation, Control switches, Circuit-breakers, Block diagrams, Switchgear, Electric control equipment, Electric contacts, Switches, Contactors, Mercury switches, Delay circuits, All-or-nothing relays, Position switches, Pushbutton switches, Limit switches, Selector switches, Fire extinguishers, Proximity switches, Fuses, Isolator switches, Polarized relays, Electrical protection equipment, Symbols, Protective relays, Graphic symbols, Circuit diagrams, Data representation, Relays, Switch-fuses
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