Contents
What is relays in your own understanding?
A relay is an automatic electric switch. This model is intended to make it easier for students to understand how a relay operates: switching one circuit causes one or more other circuits to be switched. That is why it is called a relay, after a relay race in which one runner hands the torch on to the next.
What is the relay explain?
Definition: The relay is the device that open or closes the contacts to cause the operation of the other electric control. It detects the intolerable or undesirable condition with an assigned area and gives the commands to the circuit breaker to disconnect the affected area. Thus protects the system from damage.
What is the purpose of a relay in a circuit?
Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.
How does a relay work in a circuit?
A relay is an electrically operated switch. They commonly use an electromagnet (coil) to operate their internal mechanical switching mechanism (contacts). When a relay contact is open, this will switch power ON for a circuit when the coil is activated. The example relay diagrams below show how a relay works.
What are the benefits of using a relay?
Relays allow a low current circuit to control one or more higher current circuits. Relays provide these benefits; 1. Thinner cables can be used to connect the control switch to the relay thereby saving weight, space and cost. 2. Relays allow power to be routed to a device over the shortest distance, thereby reducing voltage loss.
Where does the current go in a 5 pin relay?
Current splits inside the relay, supplying power to both the control and load circuits. A 5-PIN relay has a single control circuit, but two separate current paths for the switch: One when the relay is de-energized (OFF – no current through the control coil) and the other the energized (ON – current is flowing through the control coil).
Which is an example of an open relay?
Example 1. 4 pin (normally open) relay with the switch on the positive side of the control circuit. Example 2. 4 pin (normally open) relay with the switch on the negative side of the control circuit. Note: These circuits have been simplified to illustrate the function of a relay and therefore exclude fuse protection that would be required.