Introduction to Industrial Automation


Table 2.1  Standardized Values for Nominal



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Introduction to Industrial Automation by Stamatios Manesis, George

Table 2.1  Standardized Values for Nominal 

Voltage Selection of a Relay Coil

Values of Relay Coil Nominal Voltage

AC 50 Hz


24, 42, 48, 60, 110, 230, 380 V

DC

12, 24, 36, 48, 110, 230 V




28

 



  Introduction to Industrial Automation

to the mechanical one because the contact life is application-dependent, such as when a set of 

contacts switches a load of less than rated value.

The power relays, except for their three main power-contacts (one for each phase of the three-

phase network), may be equipped with one or more pairs of auxiliary contacts, which are used in 

the implementation of the automation circuit. Figure 2.8 shows a typical form of a power relay 

Fixed core

Moving

core


Coil cross section

Return


spring

Cable


terminals

Fixed


contact

Moving


contact

Arc


chamber

Metal or alloy

contact area

Insulation material

On-state

indicator

Moving

core


Return

spring


Cable

termina


Fixed

contact


contact area

indicator




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