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Term |
Graphical Symbol |
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in full |
simplified |
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Lines |
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line, general |
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2 lines |
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3 lines |
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4 lines |
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n - lines |
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crossing of two lines without connection |
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crossing of two lines with connection |
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shielded line |
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coaxial line |
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Line and cable connections |
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earth connection |
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ground connection (chassis or the like) |
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disconnectable and non-disconnectable electrical connection,
general |
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disconnectable electrical connection, e.g. terminal |
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cable termination |
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coupling sleeve |
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joint box for a branching |
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joint box for two branchings |
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Term |
Graphical Symbol |
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in full |
simplified |
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diode, indirectly heated |
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duodiode, indirectly heated |
or  |
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triode, indirectly heated |
or  |
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duotriode with separated cathodes, indirectly heated, heating
filament with central tapping, internal screening of the system |
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tetrode |
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pentode, suppressor grid connected with cathode |
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triode - pentode |
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triode - heptode (according to the circuit, the systems may be
drawn left-and-right reversed) |
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Term |
Graphical Symbol |
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in full |
simplified |
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Transistors |
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point contact transistor or junction transistor, type p-n-p
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n-p-n transistor |
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Semiconductor diodes |
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diode with rectifying function |
or |
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capacity diode |
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tunnel diode |
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avalanche rectifier diode |
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avalanche rectifier diode with avalanche effect in both
directions |
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backward diode |
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Thyristors |
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general |
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backward blocking |
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backward conducting |
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n-type gate, controlled at anode side |
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p-type gate, controlled at cathode side |
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Semiconductor elements which can be influenced by light
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photoresistance cell |
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photodiode |
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photocell with depletion layer |
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phototriode p-n-p |
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switching diode p-n-p-n |
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Semiconductor circuits |
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switching diode p-n-p-n |
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semiconductor valves in bridge connection |
or 
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Term |
Graphical Symbol |
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in full |
simplified |
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Switching members |
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make contacts, general |
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break contacts, general |
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change-over switch, general |
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change-over switch with central rest position |
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Relay switching members |
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make contacts |
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break contacts |
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change-over switch with interruption in switching |
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Switches |
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hand-actuated lever switch |
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make contacts with automatic resetting |
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break contacts with automatic resetting |
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disconnecting switch, three-pole |
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power circuit-breaker, three-pole |
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power breaker, three-pole |
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power switch, three-pole |
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switch, three-pole, with one make contact and two break contacts
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Drive members |
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drive, general |
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drive, thermal |
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drive by centrifugal force |
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drive by piston |
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drive by electrical motor |
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drive by cams |
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drive by float |
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manual drive |
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manual drive with automatic resetting |
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foot drive |
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actuation by means of a key |
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drive by relay or contactor |
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Electrical drive systems |
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relay winding only for alternating current |
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winding of a relay insensitive to alternating current |
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winding of an electro-thermal relay |
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winding of a remanence relay |
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winding of a polarised relay |
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winding for relay tripping by over-current |
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winding for relay tripping by undercurrent |
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winding for relay tripping by reverse current |
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winding for relay tripping by overvoltage |
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winding for relay tripping by undervoltage |
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winding for relay tripping by error voltage |
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winding for thermal tripping of relay |
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relay winding with delay of attraction |
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relay winding with delay of dropping |
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relay winding with delay of attraction and dropping |
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relay winding with electrothermal delay |
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relay winding with electronic delay |
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winding for relay tripping by open-circuit working |
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winding for relay tripping by closed-circuit working |
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winding for relay tripping by overcurrent with time lag |
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Plugged connections |
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receptacle |
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plug |
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connector, single-pole |
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connector, four-pole |
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h.f. coaxial receptacle |
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h.f. coaxial connector |
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h.f. coaxial connector, two - core |
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or
or 
