Electrical Symbols
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The following table provides the commonly used electrical wiring schematic symbols for coils and relays which comply with the IEC and BS Electrical Symbols.
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Contactor Coil
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Relay with AC Supply
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Slow Release Relay - Delay Off
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General Relay (DC Supply)
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Slow Operating Relay - Delay On
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Mechanically Latched Relay
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The following table provides the IEC and BS Electrical Symbols for contacts. We have included the Normally Open and Normally Closed status for each contact.
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Normally Open Contact (N/O) |
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Normally Closed Contact (N/C) |
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Change Over or 2 way Contact Made position |
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Fused Switch Open Contact (N/O) |
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Limit Switch (N/O) |
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Limit Switch (N/C) |
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Flow Switch (N/O) |
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Flow Switch (N/C) |
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Time Delay (N/O) Delay on Closing
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Time Delay Flow Switch (N/O) Delay on re-opening |
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Thermal Switch -Overload (N/O) |
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Thermal Switch -Overload (N/C) |
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Temperature Switch (N/O) |
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Temperature Switch (N/O) |
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Pressure Switch (N/O) |
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Pressure Switch (N/C) |
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The following table provides the commonly used electrical wiring schematic symbols for Semi Conductors including diodes, capacitors and transistors.
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Diode |
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Diode Reverse Blocking |
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Diode Reverse Conducting |
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Zener Diode |
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Light Emitting Diode |
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Capacitor |
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Transistor (PNP) |
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Transistor (NPN) |
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Bi-directional Triode Thyristor (Triac) |
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Diac |
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