An undervoltage release is a type of trip that allows the circuit breaker to be delayed or without delay when its terminal voltage drops to a specified range. When the supply voltage drops (or even slowly drops) to the rated operation. The undervoltage release shall operate within the range of 70% to 35% of the voltage. The undervoltage release shall prevent the circuit breaker from closing when the supply voltage is equal to 35% of the rated operating voltage of the trip unit. When the power supply voltage is equal to or greater than the rated working voltage of the 85% undervoltage release, the circuit breaker shall be reliably closed under hot conditions. Therefore, when a certain voltage drop occurs in the power supply voltage of the protected circuit, the circuit breaker can be automatically disconnected to cut off the power supply, so that the load electrical equipment or electrical equipment below the circuit breaker is protected from undervoltage. When in use, the undervoltage release coil is connected to the power supply side of the circuit breaker, and the circuit breaker can be closed after the undervoltage release is energized, otherwise the circuit breaker cannot be closed.
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