Normally Closed Switch Symbol. The symbol for a normally open held closed state indicates that the contact has been wired as a normally open contact but when the circuit is put into its normal off state part of the machine keeps the contact closed. If you want to use the switch for low voltage appliances the rating will not matter.
Inverter switch before opening. Inverter switch before opening. Closed normally open normally closed temperature flow air water normally open normally closed normally open normally closed foot toggle cable operated emerg switch plugging nonplug plugging w lockout coil 2 position selector 3 position nonbridging contacts rotary selector bridging or or total contacts to suit needs thermocouple switch.
An on off switch allows current to flow only when it is in the closed on position.
Other types of contacts such as those used in pressure and flow switches can be configured in a similar way. Inverter switch before closing. Circuit switch cutting contact before making contact. On off switch spst spst single pole single throw.
