GRV8-4UVR Three Phase Under Voltage Relay
Key attributes
| Brand | Switchgear parts |
| Model NO. | GRV8-4UVR Three Phase Under Voltage Relay |
| Rated frequency | 45Hz-65Hz |
| Series | GRV8 |
Product descriptions from the supplier
The GRV8-4UVR is a specialized three phase under voltage relay. It‘s compact 36mm width allows for seamless installation in space-constrained control panels, while the adjustable settings provide flexibility to tailor protection to your specific needs. Whether you’re managing a manufacturing plant, HVAC system, or power distribution network, the GRV8-4UVR delivers the precision and reliability you need.
Supply Voltage：AC 220V / 380V / 400V
Measuring Frequency Range：45Hz – 65Hz
Voltage Measurement Accuracy：<1%
Under Voltage Setting Range：Adjustable (e.g., 170V – 210V per phase)*
Trip Delay Time：Adjustable (e.g., 0.1s – 10s)*
Product Highlight:
3-Phase Voltage Monitoring: Unlike single-phase relays, the GRV8-4UVR monitors all three phases simultaneously, ensuring balanced protection for systems where phase integrity is critical.
Adjustable Under Voltage Thresholds: Fine-tune the under voltage protection levels to match the specific requirements of your equipment.
Phase Imbalance and Sequence Protection: Detects and responds to phase imbalances and incorrect phase sequences, preventing motor damage and system failures.
True RMS Measurement: Ensures accurate voltage detection, even in environments with harmonics or non-linear loads.
LED Indicators: Provides clear, real-time status updates for easy monitoring and diagnostics.
Compact Design: The 36mm width and DIN rail mounting make it ideal for space-efficient installations in control panels
| Model | GRV8-4UVR Three Phase Under Voltage Relay |
| Operating temperature | -20℃ to +55℃（-4℉ to 131℉） |
| Storage temperature | -35℃ to +75℃（-22℉ to 158℉） |
| Trip delay time(Tu) | 0.1s |
| Tightening torque | 0.8Nm |
| Electrical life(AC1) | 1*105 |
| Mechanical life | 1*107 |
| Konb setting accuracy | 10% of scale value |
| Current rating | 10A/AC1 |
| Output | 1×SPDT |
| Rated supply voltage(Un) | 220V/230V/240V |
| Switching voltage | 250VAC/24VDC |
| Rated supply frequency | 45Hz-65Hz |
| Hysteresis | 5V |
| Weight | 63g,65g |
| Dimensions | 90×18×64mm |
| Power on delay time(Td) | Adjustable: 5min-15min |
| Recovery delay time(Tr) | Adjustable: 5min-15min |
| Mounting/DIN rail | Din rail EN/IEC 60715 |
| Standards | EN 60255-1,IEC60947-5-1 |
| Overvoltage category | III |
| Protection degree | IP40 for front panel/IP20 terminals |
| Monitoring terminials | L1-L2-L3-N |
| Supply terminals | L1-N |
| Under voltage threshold | R:fixed 75% of Un |
| Function | Under voltage |
| Operating position | any |
| Supply indication | green LED |
| Output indication | red LED |
| Measurement error | ≤1% |
| 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） |
Online store
On-time delivery rate
Response time
100.0%
≤4h
Company overview
Workplace: 1000m²
Total staff:
Highest Annual Export(usD): 300000000
Services
Business Type: Sales
Main Categories: Low Voltage Electrical Apparatus/Instrument meters/Production equipment/Electrical fittings/Equipment Parts
Whole life care manager
Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.
The equipment supplier has passed platform qualification certification and technical evaluation,
ensuring compliance, professionalism, and reliability from the source.
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