Electromechanical relays (EMR) are magnetic switches that are driven by electromechanical energy, NO NC, contacts, DPDT, controls, normally open, normally close.
Many industrial control applications require relays as control components that are used as circuit interfaces. Electromechanical relays (EMR) are magnetic switches that are driven by electromechanical energy. The relay connects the load circuit ON (closes) or OFF (opens) contacts on electrical and electronic circuits. Relays generally have one coil (coil) but can have several contacts. Coils on the relay will become a magnet if electrified.

Contacts contained in the relay consist of silent (static) contacts and moving contacts. From the initial position (without electricity) between the silent contact and the moving contact, there are two contact conditions, namely normally open (NO) and normally close (NC). Normally open is the condition between silent contact and moving contact when it is not electrified in an open state (not connected). Whereas normally close is the situation between the silent contact and the moving contact when it is not electrified in a closed state (connected). If the relay is electrified, the contact state will change otherwise, ie NO will be closed and NC will open.

One of the most common EMR found on the market is the Omron MK2P-I relay. This relay has NO 2 contacts (1-3 and 8-6) and 2 NC contacts (1-4 and 8-5). Omron 220V relay diagrams are shown in the figure below.

From the type of electricity source to activate the coil / coil, the relay is divided into two namely AC relay (alternating current) and DC relay (direct current). Omron MK2P-I Relay including DPDT type (Double Pole Double Throw

From the description above it can be concluded that the relay can be used as an On / Off circuit or can also be used to change the flow of electric current. The relay application to turn on the lights alternately is shown in the circuit below.

When the button is Off, the EMR does not get electricity so the NO contact opens so that Lamp1 does not turn on and NC contacts are closed so that the Lamp2 lights up. When the button is On, the EMR gets electricity so that the NO contact is closed so that Lamp1 lights up and NC contacts open so that Lamp2 does not turn on.

The advantage of using a relay on a circuit is that it can control loads that have large power by using small power. This small power is only used to activate the relay coil. In addition, control operators will be safer than large electrical power due to controls with separate contacts. For the use of loads greater than the capacity of the relay, you can use Magnetic Contactor.

Hopefully this article can be useful.

"Don't blame those who disappoint you, but blame yourself for hoping more for them"

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