Normally Open Relay Means

When power is introduced an electromagnet pulls the first circuit into contact with the second thereby closing the circuit and allowing power to flow through. The eight electro mechanical relays in the triton controller each have two parts which stated simply are the circuit part where the incoming ac voltage from the power cord can be allowed to flow out or not and the part. The national association of relay manufacturers and its successor the relay and switch industry association define 23 distinct forms of electrical contact found in relays and switches.

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Before we get into what normally open and normally closed are let s clarify what open and closed mean.

Normally open relay means.

In other words when voltage is applied to the relay contactor terminals this contact closes. Normally closed nc contacts allow current through when the relay or contactor is not energized. Of these contact forms the following are particularly common. Meaning pronunciation translations and examples.

Normally open single pole single throw spst relay in figure 1 no dc voltage is applied to points a and b therefore no current flows through the coil of the relay the contact stays in the opened position and the fan will not be switched on because it s disconnected from the 220v. Normally open no contacts allow current when the relay or contactor is energized. Normally open relays default in the open position meaning that when they re not in use there is no contact between the circuits. Normally open switch contacts are in an open state at rest.

Relays and contactors have two types of contacts each suited for different applications. Form a contacts make contacts are normally open contacts. As with so many topics that we try to simplify by associating with something we are familiar with associating electrical current flow with water flow causes a tremendous amount of misunderstandings. Normally closed what does that mean and how are they used.

First we have the normally open timed closed notc contact. What is open and closed. The following is a description of the four basic types of time delay relay contacts. Time delay relay contacts must be specified not only as either normally open or normally closed but whether the delay operates in the direction of closing or in the direction of opening.