| Brand | MV Switchgear Accessories |
| Model NO. | GRV8-4UVS 3 Phase Under Over Voltage Relay |
| Rated frequency | 45Hz-65Hz |
| Series | GRV8 |
The GRV8-4UVS is a state-of-the-art 3 phase under over voltage relay designed to protect industrial and commercial equipment from voltage drops and phase-related issues. Engineered for reliability, this relay monitors all three phases to ensure stable operation of motors, HVAC systems, and other critical loads. Its advanced features and compact design make it an essential component for maintaining system integrity and preventing costly downtime.
Rated Voltage：AC 220V / 380V / 400V
Frequency Range：45Hz – 65Hz
Measurement Accuracy：<1%
Under Voltage Range：Adjustable (e.g., 160V – 210V per phase)*
Trip Delay Time：Adjustable (e.g., 0.1s – 10s)*
Comprehensive 3-Phase Monitoring: Tracks voltage levels across all three phases to detect under voltage and phase anomalies.
Customizable Protection: Adjustable under voltage thresholds and trip delays for tailored system protection.
Wide Frequency Range: Operates seamlessly within 45Hz to 65Hz, suitable for global power standards.
Clear Status Display: LED indicators provide instant feedback on relay operation and system health.
Efficient Installation: Compact 36mm width with DIN rail mounting for easy integration into control panels.
| Model | GRV8-4UVS Three Phase Under Voltage Relay |
| Function | Under voltage |
| Monitoring terminials | L1-L2-L3-N |
| Supply terminals | L1-N |
| Rated supply voltage(Un) | 220V/230V/240V |
| Rated supply frequency | 45Hz-65Hz |
| Under voltage threshold | S:70%-95%of Un |
| Trip delay time(Tu) | 0.1s |
| Hysteresis | 5V |
| Measurement error | ≤1% |
| Power on delay time(Td) | Adjustable: 5min-15min |
| Recovery delay time(Tr) | Adjustable: 5min-15min |
| Konb setting accuracy | 10% of scale value |
| Supply indication | green LED |
| Output indication | red LED |
| Output | 1×SPDT |
| Current rating | 10A/AC1 |
| Switching voltage | 250VAC/24VDC |
| Mechanical life | 1*107 |
| Electrical life(AC1) | 1*105 |
| Operating temperature | -20℃ to +55℃（-4℉ to 131℉） |
| Storage temperature | -35℃ to +75℃（-22℉ to 158℉） |
| Mounting/DIN rail | Din rail EN/IEC 60715 |
| Protection degree | IP40 for front panel/IP20 terminals |
| Operating position | any |
| Overvoltage category | III |
| Pollution degree | 2 |
| Max.cable size(mm²） | solid wire max.1*2.5 or 2*1.5/with sleeve max.1*2.5（AWG 12） |
| Tightening torque | 0.8Nm |
| Dimensions | 90×18×64mm |
| Weight | 63g,65g |
| Standards | EN 60255-1,IEC60947-5-1 |
