Is the NC contact of a relay normally open or normally closed?
1 Answers
Relay NC is a normally closed contact, which refers to a contact that remains closed and conductive when no power is applied. A contact refers to the output form where the load current is not connected when the detection body is inactive. The working principle of a relay is: when the change in the input quantity meets specified requirements, it causes a predetermined step change in the controlled quantity within the electrical output circuit. Relays are used in automated control circuits as automatic switches that use small currents to control the operation of large currents. Their functions in circuits include: 1. Automatic regulation; 2. Safety protection; 3. Circuit switching. They are categorized into normally open type, normally closed type, and changeover type.