Normally Open Contactor Wiring Diagram

A simple circuit diagram either of the two start buttons will close the contactor either of the stop buttons will open the contactor.

Normally open contactor wiring diagram.

Note that one one of the contactor acts as a switch for the start button. Its is important to. Normally closed nc contacts allow current through when the relay or contactor is not energized. Subscribe a simple breakdown of how a normally open switch no should operate vs how a normally closed switch nc should operate when wired correctly.

These contacts may be indicated on the label as normally open no and normally closed nc. Programmable unijunction transistor scr. Bidirectional triode thyristor ujt. In other words when voltage is applied to the relay contactor terminals this contact closes.

Relays and contactors have two types of contacts each suited for different applications. Rarely are these familiar examples good for learning but a 3 way switch is an excellent example of using normally open and normally closed switches. Now let s go through a real world example of normally open and normally closed contacts that we are all familiar with. Study the contactor manufacturer information.

Silicon controlled rectifier triac. Unijunction transistor table 1 standard elementary diagram symbols cont d battery bell annunciator buzzer horn alarm siren etc. The manufacturer information will identify the 2 input pins for 120 volts ac control. Contactor wiring and i hope after this post you will be able to wire a 3 phase motor i also published a post about 3 phase motor wiring with magnetic contactor and thermal overload relay but today post and contactor wiring diagram is too simple and easy to learn.

Normally open no contacts allow current when the relay or contactor is energized. 2 days ago i wired 380 to 440 volts contactor for a 3 phase motor and save these images of contactor in pc. The may be 2 or more sets of output contacts identified.