Table 19.2
Electrical symbols
Symbol
Symbol name
3-phase breaker
Capacitor
Contactor
A1
A2
Contactor with RC snubber
Connector dot
S1
S2
Current transformer (S1 and · show "current in"; S2 shows "current out")
Diode
F
Fuse
Ω
Ohmmeter
Relay
A1
A2
Relay with freewheeling diode
R
Resistor (IEC-60617)
Single-line diagram closed breaker
Single-line diagram open breaker
Temporary connection dot (for example, connection to a meter)
Voltage transformer. This is a generic voltage transformer, without any information about the transformer
connections. These could for example be: open delta, star-star, closed delta, and so on.
Table 19.3
Icons used in drawings
Symbol
Symbol name
Display unit DU 300
First-angle projection
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