Circuit Breaker

Circuit Breaker  :

 Electrical circuit breaker is used for protection of devices. Circuit breaker are operated automatically when the excess current flow in the circuit.  Once excess current fault is detected, Circuit breaker operated.

Circuit breaker available in different ratings and sizes.

Circuit breakers are used in operation depend upon the current ratings.

Circuit Breakers are :

1.Miniature Circuit Breaker ( MCB )

2.Molded Case Circuit Breaker ( MCCB )

3.Air Circuit Breaker ( ACB )

4. Vacuum Circuit Breaker ( VCB )

5. SF6 ( Sulfur Hex-fluoride Circuit Breaker )

Circuit breaker are used depend upon current ratings :

1.Miniature Circuit Breaker ( MCB )

  "Current rating not more than 100 A".

2.Molded Case Circuit Breaker ( MCCB )

"Current rating upto 800 A "

3.Air Circuit Breaker ( ACB )

 "Current rating upto 4000 A

4.Vacuum Circuit Breaker ( VCB )

 "Voltage rating upto 11 KV "

5.SF6 ( Sulfur Hex-fluoride Circuit Breaker )

"Voltage rating upto 115 KV "

Design :(Air circuit breaker)

1.Front sides :

Fig-Front view of Circuit Breaker(Siemens CB)

1. Arc Chute
2. Carrying Handle
3. Identification Mark
4. Motor Disconnection Switch
5. Type Label Circuit Breaker
6. Stored Energy Indictor
7. "Mechanical ON" button
8. Ampere Rating
9. Racking pictogram
10. Make Break operations counter
11. Spring charging lever
12. Racking handle
13. Draw out unit transport shaft
14. Optionas label
15. Earthing Terminal
16. Position indicator
17. Table for earth fault protection
18. Satety Lock for racking Handle
19. Mechanical Release of Racking handle
20. Overcurrent release
21. Rating plug
22. Mechanical OFF button
23. Ready to Close indicator
24. Breaker ON/OFF indicator
25. Tripped indicator
26. Locking device "OFF"
27. Front panel
28. Rceptacle for auxillary contacts