Undervoltage Release Of Low Voltage Column Mounted Circuit Breaker

If the line voltage drops to 70% of the rated voltage (called collapse voltage), the motor will not start, the lighting fixtures will be dim, and the resistance furnace will not heat up enough; and when the working voltage of the running motor drops to about 50% (called critical voltage), it will be blocked (unable to pull the load, the motor stops), and the current of the motor will increase sharply to 6IN. If the time is slightly longer, the motor will be burned. In order to avoid the above situation, it is required to install an undervoltage release on Lv Pole Mounted Circuit Breakers. The action voltage of the undervoltage release is set at (70%-35%) of the rated voltage. There are two types of undervoltage releases: instantaneous and delayed (1s, 3s, 5s...-．·). Delayed undervoltage releases are used in main lines or important branches, while instantaneous ones are often used in general branches. For areas with poor power supply quality, the voltage itself fluctuates greatly and is close to the upper limit of the undervoltage release action voltage. In this case, it is not suitable to use the undervoltage release.