An MCB (Miniature Circuit Breaker) is an electromechanical device designed to protect an electrical circuit from overcurrent, which may result from overload or short circuit. It automatically switches off the electrical circuit during abnormal conditions, thus preventing potential hazards such as fire, equipment damage, or electric shock.
How MCB Works
An MCB operates using two main mechanisms:
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Thermal Operation (Overload Protection):
A bimetallic strip inside the MCB bends when it gets heated by excessive current over time. This mechanical bending trips the breaker, disconnecting the circuit. -
Magnetic Operation (Short Circuit Protection):
During a short circuit, a sudden surge of high current activates an electromagnet inside the MCB, which quickly pulls the trip mechanism and breaks the circuit instantly.
Key Features of MCB
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Automatic tripping in case of overload or fault.
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Manual reset, unlike fuses which need replacement after a fault.
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Compact and modular design, suitable for residential, commercial, and industrial installations.
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Rated current capacity usually ranges from 6A to 32 A.
Advantages of MCB
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Faster response than traditional fuses.
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Easy to reset without replacement.
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Provides more accurate protection.
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Long-lasting and reliable performance.
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Enhances overall electrical safety.
