Circuit breaker is an electrical safety device designed to protect an electrical circuit from damage caused by an overcurrent or short circuit.
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13 Facts About Circuit breaker
2.
An early form of circuit breaker was described by Thomas Edison in an 1879 patent application, although his commercial power distribution system used fuses.
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3.
Stotz's invention was the forerunner of the modern thermal-magnetic Circuit breaker commonly used in household load centers to this day.
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4.
All circuit breaker systems have common features in their operation, but details vary substantially depending on the voltage class, current rating and type of the circuit breaker.
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5.
The circuit breaker is labeled with the rated current in amperes prefixed by a letter, which indicates the instantaneous tripping current that causes the circuit breaker to trip without intentional time delay expressed in multiples of the rated current:.
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6.
Direct current requires special breakers because the arc is continuous—unlike an AC arc, which tends to go out on each half cycle, direct current circuit breaker has blow-out coils that generate a magnetic field that rapidly stretches the arc.
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7.
DIN rail-mounted thermal-magnetic miniature circuit breaker is the most common style in modern domestic consumer units and commercial electrical distribution boards throughout Europe.
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8.
The thermal portion of the circuit breaker provides a time response feature, that trips the circuit breaker sooner for larger over currents but allows smaller overloads to persist for a longer time.
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9.
Magnetic-hydraulic circuit breaker uses a solenoid coil to provide operating force to open the contacts.
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10.
Shunt-trip unit appears similar to a normal Circuit breaker and the moving actuators are 'ganged' to a normal Circuit breaker mechanism to operate together in a similar way, but the shunt trip is a solenoid intended to be operated by an external constant voltage signal, rather than a current, commonly the local mains voltage or DC.
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11.
Sulfur hexafluoride circuit breaker uses contacts surrounded by sulfur hexafluoride gas to quench the arc.
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12.
Disconnecting circuit breaker was introduced in 2000 and is a high-voltage circuit breaker modeled after the SF6-breaker.
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13.
In 2012, ABB presented a 75kV high-voltage Circuit breaker that uses carbon dioxide as the medium to extinguish the arc.
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