China Self-Resetting Overvoltage and Undervoltage Delay Protection Device Three-Phase 4P63A Manufacturers, Manufacturer
Introduction to the overvoltage and undervoltage delay protector for three-phase 4P63A incoming line:
Functional features Overvoltage and undervoltage protection: When overvoltage or undervoltage occurs in a three-phase line, it can quickly cut off the circuit to protect the equipment at the back end. The overvoltage action value is 460V±5V, and the undervoltage action value is 300V±5V. Automatic reset: Once the voltage returns to the normal range, the protector will automatically reconnect the circuit after the specified delay time. The recovery delay time is 60 seconds. Other protections: Some products also feature protection functions such as phase failure, neutral line failure, and three-phase imbalance. The 3P+N system can monitor and protect against various fault conditions.
Usually, a 4P electrical disconnector is adopted as the main electrical circuit on-off control switch, and an intelligent controller is equipped for three-phase voltage sampling measurement and drive control of the micro electric operating mechanism. The intelligent controller monitors the three-phase voltage in real time. When the voltage exceeds the normal range, it controls the micro electric operating mechanism to open the 4P electrical disconnector through the transmission handle, cutting off the circuit. When the voltage returns to normal, control the switch to close and restore power supply.
Scope of Application
The fully automatic overvoltage and undervoltage delay protector is a new generation of product developed in response to market demands. This protector is rationally designed and assembled with imported components and well-known domestic brand components, and is manufactured by advanced technological means. The product can quickly and reliably cut off the power supply under high voltage impact and low voltage conditions to protect household appliances. When the voltage returns to the normal value, it can automatically reconnect the circuit and restore power supply after a delay. It can effectively protect appliances from the impact of instantaneous power supply. All functions are fully automated and do not require dedicated operation. It adopts dual-color LED indication. It is generally installed in the distribution box, close to the incoming line end, in order to protect the entire three-phase circuit. It is widely applied in three-phase power supply systems of industries, commercial buildings and households, such as power distribution systems in factory workshops, shopping malls, office buildings, hotels and other places, providing overvoltage and undervoltage protection for three-phase motors, air conditioners, elevators and other equipment.
Wiring Method
Parameter Information
Product name
Auto-recovery voltage protective device
Overvoltage starting value
460±15V
Rated current In
63A
Undervoltage starting value
300±15V
The rated voltage
AC400V
Undervoltage Startup time
≤60s
The number of poles
4P
Self power consumption
<2W
Rated frequency
50/60Hz
Electrical mechanical life
>100,000 times
Product Size
Detailed Pictures
Frequently Asked Questions
How does the auto-recovery function work?
The intelligent controller monitors voltage in real-time. If voltage stabilizes within the normal range after an anomaly, the device automatically reconnects the circuit after a preset delay, restoring power without manual intervention.
What are the specific protection thresholds?
The overvoltage starting value is 460±15V, and the undervoltage starting value is 300±15V, providing a reliable buffer for three-phase systems.
Where should this protector be installed?
It is typically installed within the distribution box, ideally close to the incoming line end, to ensure comprehensive protection for the entire downstream circuit.
Is it suitable for industrial use?
Yes, it is widely used in industrial workshops, commercial buildings like hotels and malls, and residential power distribution systems to protect motors, elevators, and HVAC equipment.
What does the dual-color LED indicate?
The dual-color LED provides a visual status of the power conditions, helping users quickly identify whether the system is operating normally or is in a protected/tripped state.
What is the mechanical life expectancy of the device?
The device is designed for high durability with an electrical mechanical life exceeding 100,000 operations.
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