23-06-21 Relay

Relay:- Relay is nothing but an electrical switching circuit.

Relay is a monitoring & sensing device.

The function of a realy is to monitor the parameters & sense any abnormalities in the circuit.

Realy control electrical circuit by opening & closing contacts in another circuit.

Relay does not trip any circuit, Relay sends a command or signal to the Circuit Breaker for tripping purpose.

Relay symbol

Types of Relay:- 

1) Electro thermal realy

2) Electro mechanical relay

3) Solid state relay

4) Hybrid relay

5) Polarized relay

6) Non polarized relay

7) Buchholz relay

Relay

22-06-21 Circuit Breaker

Circuit Breaker:- A device which can make or break the circuit manually or automatically under normal & faulty condition.

                             OR

Circuit breaker is a automatically operated electrical switch device.

It protects electrical circuit & machine through any electrical fault.                                                               

Types of Circuit Breaker:- According to Voltage Level There are Three Types,

1) Low Voltage CB:- MCB, MCCB, ELCB, ACB, RCCB. (Under 1 Kilo Voltage)

2) Medium Voltage CB:- VCB, ACB (1KV to 72KV)

3) High Voltage CB:- ABCB, OCB, SF6, VCB    (Above 72.5KV)

                                 

Circuit Breaker