Circuit Breakers
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Description
A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overcurrent/overload or a short circuit. Its basic function is to interrupt current flow after protective relays detect a fault.
The five universal circuit breaker components are:
Frame – Protects internal parts of the circuit breaker from outside materials
Operating mechanism – Provides a means of opening and closing the circuit breaker
Contacts – Allows the current to flow through the circuit breaker when closed.
Arc extinguisher – Extinguishes an arc when the circuit breaker interrupts a fault.
Trip unit – Opens the operating mechanism in the event of a prolonged overload or short circuit.
- MOLDED CASE CIRCUIT BREAKER
- MINIATURE CIRCUIT BREAKER
- AIR CIRCUIT BREAKER
- MOTOR PROTECTION CIRCUIT BREAKER (MPCB):
- RESIDUAL CURRENT CIRCUIT BREAKER (RCCB):
Application
TYPES OF CIRCUIT BREAKERS
Circuit breakers mainly are categorized on the basis of application as per voltage:
MCCB or Molded Case Circuit Breaker is a kind of circuit breaker which is enclosed in the moulding or housing of a moulded material & that is the reason it is known as Molded Case Circuit Breaker. It is generally used for the current ratings up to 1600A & fault level up to 150KA. It offers protection against overload & short circuits through bimetal & solenoid, these days Microprocessor-based MCCBs are being very popular due to the quick functioning of their electronic type release.
MCB or Miniature Circuit Breaker is a circuit breaker that is used for protection where current ratings are lower. It can be used up to 125A circuits & like MCCBs it also offers protection against overload & short circuits through bimetal & solenoid. These days Class 3 MCBs are very popular due to their ability to trip quickly & also minimum loss of let-through energy.
AIR CIRCUIT BREAKER or ACB as the name suggests it’s the circuit breaker where the medium of arc quenching is air. ACB is used for high current applications, or we can say that ACB can offer protection against overload & short circuits up to 6300A. Tripping in ACB is achieved through release. The release is known as the mind of ACB as it only suggests the ACB to trip in case of fault.
MPCBs are used especially for motor protection. MPCB as a standalone device offers protection against Overload, Short Circuit & Single Phasing, thus is used specifically for motor applications.
RCCBs as the name suggests offer protection against Earth Leakage. It is used in homes, offices & industries according to the current sensitivity required as per application. In case of current leakage, it senses the same & trips thus, saving the human & circuit from shock & adverse effects of current leakage.
Technical Docs
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