Brief introduction about ZS8-3VA adjustable voltage and current Magnetic holding relay Overvoltage and undervoltage protector :
When the voltage return to normal after 30 seconds the power supply automatically connects.
An important device used to protect electrical equipment from overvoltage and undervoltage caused by grid faults. It mainly consists of magnetic holding relays, voltage sensors, microprocessors, and modular standard designs. When overvoltage or undervoltage occurs in the power supply line, the protector can quickly and safely cut off the circuit under continuous high voltage impact, avoiding the occurrence of accidents caused by abnormal voltage entering the terminal electrical appliances. When the voltage returns to normal, the protector will automatically turn on the circuit within the specified time, ensuring that the terminal appliances operate normally without human supervision.
working principle
Voltage monitoring: The protector monitors the voltage of the power system in real time through voltage sensors.
Signal transmission: When the voltage is lower or higher than the set value, the voltage sensor transmits an abnormal signal to the microprocessor.
Microprocessor processing: The microprocessor performs calculations, comparisons, and controls signals to cut off or turn on circuits by changing the state of the magnetic holding relay.
Automatic recovery: When the voltage returns to normal, the protector will automatically connect the circuit within the specified time and resume normal operation.
main features
Quick response: able to quickly cut off the power supply at the moment of abnormal voltage, reducing damage to electrical equipment.
Automatic recovery: After the voltage returns to normal, the protector will automatically connect the circuit to ensure the normal operation of the equipment.
Long service life: Using high-speed low-power processors and magnetic holding relays to ensure long-term stable operation.
Modular design: easy to install and maintain, suitable for the needs of various power systems.
Application scenarios
Household and shopping mall power distribution: used for overvoltage, undervoltage, phase failure, and zero line protection in single-phase AC230V and three-phase four wire AC415V lines.
Industrial equipment protection: widely used for voltage protection of equipment such as distribution boxes, central air conditioning units, electrical control boxes, distribution cabinets, cranes, etc.
Parameter settings
Working voltage: AC220V， Frequency 50Hz.
Overvoltage action cut-off value: AC275 ± 5V.
Undervoltage action cut-off value: AC170 ± 5V.
Power outage delivery delay: ≤ 60 seconds.
Action delay time: ≤ 1 second.
Self power consumption: ≤ 2W.
Electrical and mechanical lifespan: ≥ 100000 cycles.
matters needing attention
Adjusting the parameters of the protector requires professional electricians to operate, which poses a risk of electric shock.
During use, the status of the protector should be regularly checked to ensure its normal operation.
