4P 63A Din Rail Breaker

Applicable scope: LFM10-63 series miniature circuit breaker is applied to the terminal distribution circuit in commercial office building, residential housing and general industrial application, providing overload and short-circuit protection for the lines, and completing infrequent switching...

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Applicable scope:

LFM10-63 series miniature circuit breaker is applied to the terminal distribution circuit in commercial office building, residential housing and general industrial application, providing overload and short-circuit protection for the lines, and completing infrequent switching operation for the lines in normal circumstances. The circuit breaker is applied to the lines with AC 50/60 Hz, rated voltage of 230/400 V,and rated current to 63A.


Provided with finger touch protection combined wiring terminals, and contact closure and disconnection indicators, presenting higher security,and various modular accessories can be configured.

The exposed front face of the product is in two forms,straight shape and arc shape. 


Conform to the standard: GB10963.1 IEC/GB14048.2 IEC/EN60947 EN60898-1-2.


Operation:

The circuit breaker must first detect a fault condition. In small mains and low voltage circuit breakers, this is usually done within the device itself. Typically, the heating or magnetic effects of electric current are employed. Circuit breakers for large currents or high voltages are usually arranged with protective relay pilot devices to sense a fault condition and to operate the opening mechanism. These typically require a separate power source, such as a battery, although some high-voltage circuit breakers are self-contained with current transformers, protective relays, and an internal control power source.

Once a fault is detected, the circuit breaker contacts must open to interrupt the circuit; this is commonly done using mechanically stored energy contained within the breaker, such as a spring or compressed air to separate the contacts. Circuit breakers may also use the higher current caused by the fault to separate the contacts, such as thermal expansion or a magnetic field. Small circuit breakers typically have a manual control lever to switch off the load or reset a tripped breaker, while larger units use solenoids to trip the mechanism, and electric motors to restore energy to the springs.


The circuit breaker contacts must carry the load current without excessive heating, and must also withstand the heat of the arc produced when interrupting (opening) the circuit. Contacts are made of copper or copper alloys, silver alloys and other highly conductive materials. Service life of the contacts is limited by the erosion of contact material due to arcing while interrupting the current. Miniature and molded-case circuit breakers are usually discarded when the contacts have worn, but power circuit breakers and high-voltage circuit breakers have replaceable contacts.

When a high current or voltage is interrupted, an arc is generated. The length of the arc is generally proportional to the voltage while the intensity (or heat) is proportional to the current. This arc must be contained, cooled and extinguished in a controlled way, so that the gap between the contacts can again withstand the voltage in the circuit. Different circuit breakers use vacuum, air, insulating gas, or oil as the medium the arc forms in. Different techniques are used to extinguish the arc including:

•Lengthening or deflecting the arc

•Intensive cooling (in jet chambers)

•Division into partial arcs

•Zero point quenching (contacts open at the zero current time crossing of the AC waveform, effectively breaking no load current at the time of opening. The zero crossing occurs at twice the line frequency; i.e., 100 times per second for 50 Hz and 120 times per second for 60 Hz AC.)

•Connecting capacitors in parallel with contacts in DC circuits.

Finally, once the fault condition has been cleared, the contacts must again be closed to restore power to the interrupted circuit.


Technical data


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