PRESENTATION ON MCB AND ELCB 4.pptx

resentation on m.c.b and e.l.c.b

1. PRESENTATION ON M.C.B AND E.L.C.B PRESENTED BY: - Ansh Garg(806) SUBMITTED TO: Mrs. Ramneek kaur Gill Lecturer of E.E Dept.

2. Pictorial View of M.C.B Double Pole Single Throw M.C.B Single Pole Single Throw M.C.B

3. CONTENT INTRODUCION FUNCTION CONSTRUCTION OF MCB WORKING PRINCIPLE ADVANTAGE APPLICATION

4. INTRODUCTION An MCB is an automatically operated electrical switch. Miniature circuit breakers are intended to prevent damage to an electrical circuit as a result of excess current. They are designed to trip during an overload or short circuit to protect against electrical faults and equipment failure.

5. FUNCTION The Function of the M.C.B is Switching mechanism i.e it simply on/off the circuit connected by it. Its main fuction is the Protection of appliaces or other electrical equipments from overloads and short circuiting.

6. CONSTRUCION

7. Mcb is meant for two type of overcurrent situation overload and short circuit. It contain of magnetic and thermal trip unit. Both units acts independently and mechanically with breaker’s trips mechanism to open breaker’s contact. The magnetic trip unit protect against a short circuit. The thermal trip unit protects against continuous overload

8. HOW IT WORKS ? Lets understand through an animation.

9. TESTING OF M.C.B

10. APPLIC A TION A mcb is used in new construction instead of the older type of fuse. Circuit breaker are small device used to control and protect the electrical panel and the other device from overflowing of electrical power. Mcb are much safer than the typical fuse because they can be reset manually and because they handle much larger amounts of power hence they are used in home application.

11. Pictorial View of E.L.C.B

12. CONTENT INTRODUCTION FUNCTION CONSTRUCTION WORKING PRINCIPLE OF ELCB ADVANTAGE APPLICATION

13. INTRODUCTION An elcb is a safety device used in electrical insallation with high earth impedence to prevent shock. It detects small stray voltage on the metal enclosure of electrical equipment and interrupts the circuit if a dangerous voltage is detected. It basic function is to detect a fault condition and then must be replaced,circuit breaker can be rest to resume normal operation.

14. FUNCTION An elcb is special type of latching relay that has a bulding,incoming mains power connected through it switching contact so that the elcb disconnected the power in an art leakage condition. The elcb detects fault current from live to the earth wire within the insallalization it protects. If sufficiently volage aapears across the elcb sence coil,it will switch off the power ,and remain off until manullay reset.

15. CONSTRUCTION

16. HOW IT WORKS ? Lets understand through an animation.

17. WORKING OF ELCB When the fault occurs, the leakage current start flowing through conductor so there will be non zero flux set up in current transformer core. The metal housing of the induction of the induction motor is always connected to earth. If user standing on earth touch the live point the protection against such current is essential and it is provide by device called elcb

18. TESTING OF E.L.C.B

19. ADVANTAGE They are less sensitive to fault condition therefore have less nuisance strips. They can be aarnnged to protect against cable damage only. And not strip on faults in down line installations.

20. THANK YOU