Normally Open / Normally Closed

Electrical switch contacts are classified as either normally-open or normally-closed, referring to the open or closed status under “normal” conditions.

In the NORMALLY OPEN the contact is open, is no flow current in the absence of pressure. When the pressure setting is reached, the electrical contact close. In the NORMALLY CLOSED, the contact is closed in presence of pressure. The contacts are closed and the signal is present on the external contacts. When the pressure setting is reached, the electrical contact rises and interrupts the signal.

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