What is Circuit Breaker
                     Circuit 
Breaker
Aeliya Marine Tech Pvt. Ltd
What is Circuit Breaker
A circuit breaker is a safety device used in electrical 
systems to protect against overloads or short circuits. It's 
kind of like a switch that automatically flips off when it 
detects too much current flowing through the circuit, 
preventing damage to the wires or appliances and reducing 
the risk of fire. When the circuit breaker trips, you usually 
have to manually reset it to restore power to the circuit.

Types Of Circuit Breaker
1. Molded Miniature Circuit Breaker (MCB)
2. Case Circuit Breaker (MCCB)
3. Air Circuit Breaker (ACB)
4. Oil Circuit Breaker
5. Vacuum Circuit Breaker
6. SF6 Circuit Breaker
7. Residual Current Circuit Breaker (RCCB)
Miniature Circuit Breaker (MCB)
• These are commonly used in residential and commercial electrical 
panels.
• They are compact and designed for lower current loads.
• MCBs trip (shut off) when they detect an overload or a short circuit.
Molded Case Circuit 
Breaker(MCCB)
• Similar to MCBs but larger and more robust.
• Suitable for higher current applications, often used in 
industrial settings.
• Provides better protection against overcurrent and 
short circuits.
Air Circuit Breaker (ACB)
• Used for high-power applications such as large industrial 
systems.
• Operates by quenching the arc in the air.
• Offers adjustable trip settings and can handle high 
currents.
Oil Circuit Breaker
• Utilizes oil as an arc extinguishing medium.
• Commonly used in high-voltage applications.
• The oil helps in cooling and interrupting the 
current flow during a fault.
Vacuum Circuit Breaker
• Uses a vacuum as the arc quenching medium.
• Suitable for medium to high-voltage applications.
• Compact, reliable, and requires less maintenance 
compared to oil circuit breakers.
SF6 Circuit Breaker
• Uses sulfur hexafluoride gas for arc extinguishing.
• Commonly used in high-voltage applications.
• Provides good insulation properties and is efficient in 
extinguishing arcs.
Residual Current Circuit Breaker 
(RCCB)
• Designed to protect against electrical shock.
• Detects the imbalance in current between the live 
and neutral wires and trips if a leakage is detected.
• Commonly used in homes to protect against ground 
faults.
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