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Symbols of Contact Units






Because a wiring diagram should limit itself to the reproduction of the essentials, the symbols for contact units should show just enough so that it is easily recognisable and cannot be mixed.



1 -> Current source
2 -> Conductor
3 -> Switch
4 -> Ground


5 -> Light bulb
6 -> Light bulb with two light fixings
7 -> Tension meter (Voltmeter)
8 -> Ammetre

9 -> Resistance
10 -> Fuse
11 -> Wire (fixed)
12 -> Wire (not fixed)


1 -> Diode

2 -> PNP-transistor

3 -> NPN-transistor

4 -> Rheostat

5 -> Condenser

6 -> Power relay





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Translator: Don Leslie - Email: lesdon@t-online.de

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