The circuit breaker has arc extinguishing equipment, so the circuit breaker can be operated with load, not only the load current, but also the fault (short circuit) current; The circuit breaker has a good package form, so simply observing the circuit breaker cannot intuitively determine whether it is in the closed or disconnected position.
The disconnector does not have arc extinguishing equipment, although the regulations and rules can be operated in the case of load current less than 5A, but it is generally not able to operate with load; However, the structure of the barrier switch is simple, and its operation status can be seen at a glance from the appearance, and there is a significant disconnection point during maintenance.
The disconnector is divided into directions, and there is an insulation distance between the contacts that meet the requirements of the rules and a significant disconnection mark; A switchgear that can carry currents under normal circuit conditions and under abnormal conditions (e.g., short circuits) for a regular period of time when in azimuth.
Disconnector (commonly known as "knife switch"), generally refers to the high-voltage barrier switch, that is, the rated voltage of 1kV and above the barrier switch, usually referred to as the barrier switch, is the most used in high-voltage switchgear electrical appliances, its own operating principle and structure are relatively simple, but because of the large amount of use, the operation reliability of the requirements are high, the impact on the planning, establishment and safe operation of substations and power plants are greater.
The primary feature of the disconnector is that it has no arc extinguishing ability, and can only open and close the circuit without load current. The barrier switch is used at all levels of voltage, used to change the circuit connection or block the line or equipment from the power supply, it has no ability to cut the current, and can only be operated after disconnecting the line with other equipment. Generally, there is an interlocking device to avoid misoperation of the switch when it is loaded, and sometimes a pin is needed to avoid disconnecting the switch under the magnetic effect of a major problem.
Circuit breaker refers to a switchgear that can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a regular time.
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