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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
Normally open Contact
(N/O)
Normally Closed Contact
(N/C)
Change Over or 2 way Contact
Made position
Fused Switch Open Contact
(N/O)
Limit Switch
(N/O)
Limit Switch
(N/C)
Flow Switch
(N/O)
Flow Switch
(N/C)
Time Delay
(N/O)
Delay on Closing
Time Delay
(N/O)

Delay on re-opening
Thermal Switch - Overload
(N/O
)
Thermal Switch - Overload
(N/C)
Temperature Switch
(N/O)
Temperature Switch
(N/C)
Pressure Switch
(N/O)
Pressure Switch
(N/C)