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The following table provides the commonly used electrical wiring schematic symbols for push-buttons and lamps which comply with the IEC and BS Electrical Symbols. We have included the Normally Open and Normally Closed status for each contact.
Normally Open PB
(N/O)
Normally Closed PB
(N/C)
Emergency Stop PB
(N/O)
Indication Contact
Emergency Stop PB
(N/C)
Pull Switch
(N/O)
Pull Switch
(N/C)
Turn/Rotary Switch
(N/O)
Turn/Rotary Switch
(N/C)