The instantaneous tripping of the circuit breaker is protective when the protected electric circuit or equipment generates a large overload or short-circuit current. When the electrical equipment is short-circuited in the near area (ie, metal direct short circuit), the short-circuit current can reach more than 20In; However, some insulation resistances caused by insulation aging, insulation moisture, conductive dust, etc. are greatly reduced, and even the overcurrent generated by insulation breakdown is much smaller than the accident short-circuit current, but it is still enough to cause damage to the power distribution system. Electromagnetic tripping must act quickly and effectively, so that the circuit breaker cuts off the main circuit. Of course, the instantaneous tripping current should not be set too small. In principle, the starting current that can avoid the load is subject to. Generally adjustable instantaneous tripping current range can be set according to 5-10In or 6-12In specified in GB14O48.2. Adjustable trip current setting range. As a protective molded case circuit breaker, it is not only required to cut off the faulty line quickly and effectively, but also must cooperate with the overload capacity of the protected electrical equipment to prevent unnecessary tripping and cause power interruption to the power distribution equipment and lines. In terms of. The purpose of the long delay current of the molded case circuit breaker is to adapt to the change of the load capacity and load nature of the power distribution system, which can be appropriately adjusted by the user at the discretion of the user, so that the electronically tripped state can be protected. The lengthening delay current range is wide, generally can be set in the range of 0.4-1.OIn, and the adjustable long delay current range of the thermomagnetic circuit breaker is relatively more than the thermomagnetic adjustable tripping molded case circuit breaker. Broad development and application prospects.
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