EXUR3 Voltage Protection Relay
An integrated, intelligent protection device combining over-voltage, under-voltage, and over-current protection. In the event of a fault, the device instantly cuts off the power supply to safeguard the equipment and supports fully automatic power restoration once conditions normalize.
Intelligent and fully adjustable: All key parameters—such as protection thresholds and reset values for voltage and current, as well as circuit recovery and reset timings—can be customized.
Suitable for all scenarios: Widely applicable in low-voltage power distribution areas, including homes, shopping malls, schools, and factories.
Product Information
Technical Parameters
| Model | EXUR3 |
| Number of Poles | 1P+N,3P+N |
| Rated Operational Voltage | AC 220V |
| Rated Operational Current | 1-40A adjustable(default 40A),1-63A adjustable(default 63A) 1-80A adjustable(default 80A),10-100A adjustable(default 100A) |
| Rated Operational Frequency | 50Hz/60Hz |
| Over-voltage Trip Threshold | 240V-300V adjustable(default 270V) |
| Over-voltage Recovery Threshold | 235V-295VAC adjustable(starts 5Vbelow over-voltage threshold;default 265V) |
| Under-voltage Trip Threshold | 140V-200V adjustable(default 170V) |
| Under-voltage Recovery Threshold | 145V-205VAC adjustable(starts 5V above under-voltage threshold;default 175V) |
| Over-current Trip Threshold | 40A:1-40A adjustable(default 40A);63A:1-63A adjustable(default 63A) 80A:1-80A adjustable(default 80A);100A:10-100A adjustable(default 100A) |
| Power-on and Power-restoration Delay Time | 1-300s adjustable(default 5s) |
| Over/Under-voltage Recovery Delay Time | 5-300s adjustable(default 30s) |
| Over-current Recovery Delay Time | 30-300s adjustable(default 30s) |
| Over-current Trip Delay Time | 6s(over-current condition confirmed and protection triggered if duration exceeds this time) |
| Electrical and Mechanical Life | >100,000 operations |
| Mounting Method | Standard DIN-rail mounting |
Appearance and Dimensions
FAQ
What is a voltage protection relay?
A voltage protection relay is an electrical instrument that checks the voltage levels of a circuit, and activates a protective measure (like operating a circuit breaker) when the voltage is either too high or too low.
What is the purpose of a protection relay?
Protection relay aims to recognize unusual states in electric circuits such as overvoltage, under-voltage, overcurrent or faults, and take an action to rectify the problem.
What is the purpose of overvoltage protection?
Overvoltage protection acts as a defense mechanism for electrical equipment against destruction from excessive voltage caused by lightning strikes, switching surges or grid faults. It disconnects the supply when the voltage level exceeds the permissible limits.
What is the purpose of a voltage relay?
The voltage relay is responsible for continuously monitoring the voltage of electrical devices in order to detect any faults that may occur when the voltage is either too high or too low. The relay will disconnect the circuit in the event of an overload or undercurrent, and once the voltage levels return to an acceptable range, it will turn the power back on.
What is the difference between over-voltage and under-voltage protection?
The over-voltage protection is triggered when the voltage exceeds a certain point (for example, 270V), hence preventing destruction of insulating materials or burning out of the equipment. The under-voltage protection is activated when the voltage goes below a certain point (for example, 170V), hence ensuring no stalling or overheating of the engine as well as malfunctioning due to inadequate power supply.
Can a voltage protection relay automatically reset after a fault?
Indeed, intelligent voltage protection relays such as the EXUR3 provide fully automatic restoration of power after voltage and current parameters have returned to their normal conditions. The recovery time can be customized to ensure proper operation of the system before power comes back.
