• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

How Engineering Works

  • Home
  • MCQ
    • Electrical MCQ
    • Civil MCQ
    • Mechanical MCQ
  • Interview Questions
  • About Us
  • Privacy Policy
  • Disclaimer
  • Contact Us

What is the difference between relay and circuit breaker?

September 20, 2017 by Ravi

DWQA Questions › Category: Switchgear and Protection › What is the difference between relay and circuit breaker?
0 Vote Up Vote Down
Ravi asked 6 years ago
4 Answers
0 Vote Up Vote Down
Kunal answered 6 years ago

Fundamental difference is that Relay is a sensing device where as Circuit Breaker is a fault interrupting equipment
.
Relay is a protective device which senses the faulty conditions in a power system line and initiates the operation of circuit breaker to isolate the faulty part from the rest of the healthy power system.Examples of relays are Over Current relay,Directional relay,etc..

Circuit Breaker is a device which can

  • Make or break circuit under normal conditions either manually or through remote control.
  • Break circuit automatically under faulty conditions.
  • Make or break circuit under faulty conditions either manually or through remote control.
0 Vote Up Vote Down
Dezin answered 6 years ago

A Circuit breaker is a protective device, used to interrupt current when a overcurrent fault occurs.
A relay is a switching device, it can be controlled remotely and used to make a small signal control a larger signal (amplification of sorts). It is used to control currents in normal operation.

0 Vote Up Vote Down
Pankaj Tiwari answered 6 years ago

Relay :- It is a sensing device which is connected to power circuit and when any parameter of circuit crosses safe limits, it sends signal to the CIRCUIT BREAKER to break the circuit.

Circuit Breaker :- A part of switchgear which is connected in circuit and it opens the circuit ( or you can say break the circuit) on receiving signals from RELAYs.

Therefore relays do only the sensing part and makes the circuit breaker open its contacts to break the circuit.

1 2 Next »

Primary Sidebar

Related Questions

  • What are the main feature of directional relay? asked by admin
  • How does a capacitor correct a power factor? asked by admin
  • What are incipient faults in power system? asked by admin
  • Why CBCT can’t detect phase to phase fault? asked by

INTERVIEW QUESTIONS

MCQ or Objective


Recommended Post

MCQs on Transformer

Starting methods of synchronous motor?

MCQ on Power electronics – 1

MCQ on Power System – 1

MCQ on Alternator – 1

Categories



Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@ Since-2017