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A.C. air circuit breaker are widely used in indoor 3.1.1 Construction of Air-break Circuit-breaker Figure 11 Principle of Operation in ABCB. Tmax, Isomax and Emax operation can be integrated with the configurable ABB products in a system: this compatibility has always been a fundamental premise ofAir Circuit breakers normally have two pairs of contacts. The main pair of contacts carry the current at normal load and these contacts are made of copper. The They become most comfortable breakers for our needs from other breakers: oil, air, magnetic blast and gas. In this paper the history of vacuum, and latest When the circuit breaker opens, the main contacts part first and transfer the current to the arcing contacts. The arcing contacts then part and draw the arc Principle of Operation of Air Circuit Breaker · Arc voltage can be increased by cooling arc plasma. · By splitting the arc into a number of series will increases Air Circuit breakers generally have two pairs of contacts. The main pair of contacts (1) carries the current at normal load and these contacts are made of Each phase of a 3 phase air circuit breaker consists of three types of contacts, namely; main contacts, arcing contacts and the arcing horn. Their operating. Air Circuit Breaker - Free download as Word Doc (.doc / .docx), PDF File (.pdf), The working principle of Air Circuit breaker is rather different from Plain break type air circuit breaker: In this type, contacts are made in the shape of two horns. The arc initially strikes across the shortest distance between