Graphical symbols
Description
S.P.D.T.
Single Pole Double Throw
(Changeover contact)
S.P.S.T. - N.O.
Single Pole Single Throw
Normally Open (Make contact)
S.P.S.T. - N.C.
Function
In rest position the COM terminal is connected to the
NC contact. When the actuator is depressed, COM and
NC break contact and COM and NO make contact.
When the switch is actuated, contact is made.
When the switch is actuated, contact is broken.
Graphical
Single Pole Single Throw
Normally Closed (Break contact)
Auxiliary actuator
Actuator
Silver- or “GoldCrosspoint” Contact
NC-terminal (2)
NO-terminal (4)
COM-terminal (1)
13
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