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-Relay used to make isolation in two different circuits with different properties .
-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. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.
(1) Relay is a device which has become an essential component in the today's technology.
(2) Depending upon the Type of Application, relays are selected.
(3) The Purpose of relay in Electrical system as follow below:
Relays are utilized to protect electric power systems against trouble and power blackouts as well as to regulate and control the generation and distribution of power
it is used mainly for switching
relay is a device which senses the fault and sends the signal to the circuit breaker before the equipment gets damage.
HI
Basically, relay is a electrically operated switch. It is not device. it is used for isolation of the control circuit .Many relays use an electromagnet to mechanically operate a switch, but other operating principle are same
In modern machines Relays are operated by control voltage of the system (normally low volt DC) and switch on/off the power supplied (normally high volt AC) to other devices in the system.
There are various other used as well, I just mentioned one which I find most common.
When you use a relay, you keep current portion of the circuit away from the switch and pulls the current directly from the battery to your KC's. The relay also allows you to tie your lights into a secondary12-volt circuit such as your high/low beams or ignition.
safety of Electrical instruments
Relay s.provide isolation in power circuit . Realys are often used with CTs and PTs or VTs which are used for protection,Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit.
relay sensing element actuates the circuit breaker in abnormal current flow condition.