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PPT ON MCB
Miniature Circuit Breakers (MCBs) provide overcurrent protection in electrical circuits. MCBs have replaced traditional fuses in many applications. MCBs have three main components: a thermal unit to sense overloads, a magnetic unit to sense short circuits, and arc chutes to suppress arcs. When too much current flows, the bimetal in the thermal unit bends and trips the circuit. For short circuits, a magnetic field trips the circuit. MCBs can be reset by flipping the switch after a fault is corrected, while fuses must be replaced. MCBs are more compact, reusable, and provide easier fault identification than fuses.
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PPT ON MCB
- 1. MINIATURE CIRCUIT BREAKER (MCB) by S.Santhosh Kumar 14125A0231
- 3. Objective To understand thecomponents, working principle of Miniature Circuit Breaker (MCB), and its advantages over traditional fuse.
- 4. Contents • Introduction: historyand its use • Function • Construction of MCB • Working Principle • Advantages • Application • Comparison : Fuse Vs MCB • Conclusion
- 5. Introduction • Thomas Edisondeveloped the idea for a circuit breaker in 1879. • Granville Woods improved upon the design and invented the automatic circuit breaker in 1900. • Cutter Manufacturing Company manufactured the first circuit breakers in Philadelphia in 1904.
- 6. Functions • Switching Function:On/Off • Protection Function: Overloads/Short Circuits
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- 9. Main Parts ofMCB THERMAL UNIT MAGNETIC UNIT
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- 11. Parts of MCB INCOMINGAND OUT GOING TERMINAL INSIDE OF MAGNETIC UNIT
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- 19. Comparison: MCB Vsfuse MCB (Miniature Circuit Breakers) FUSE 1 MCB trips off in case of excessive load. Fuse melts/fuses in case of excessive load. 2 MCB is to be just put-on after correcting the fault in wiring. Fuse needs to be replaced with a new one. 3 Since we do not change the MCB, there is no risk of putting on the MCB/switch even if the fault is not correctly repaired. There is a risk of putting on the switch in case; due to ignorance higher capacity fuse-wire is positioned. 4 Compact, small equipment. Porcelain base and top. Not attractive. 5 Works on Bi-metal expansion or induced magnetism. Works on melting/fusing due to high temperature. 6 Relatively costlier than fuse. Relatively cheaper than MCB.
- 20. Advantages over fuse •Easily identify the faulty zone of electrical circuit • Simple to resume supply • Better Interface: knob • Electrically safer • More sensitive to current than fuse • Reusable • Less maintenance and replacement cost.
- 21. Applications • Home ElectricalPanels • Ground Fault Trip Mechanism • Lights • Industrial Applications • Heaters
- 22. Conclusion Miniature Circuit Breakersare more effective than traditional fuse.
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