GRV8-21...26 3-Phase Voltage Relay
GRV8-21...26 3-Phase Voltage Relay - Image 2
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GRV8-21…26 3-Phase Voltage Relay

GEYA’s GRV8-21…26 series of 3-Phase Voltage Relays are engineered to deliver robust protection for your electrical systems. These relays monitor critical parameters including overvoltage, undervoltage, phase asymmetry, phase failure, and phase sequence errors. Featuring True RMS measurement technology, the GRV8 series ensures precise voltage monitoring, while its adjustable settings allow customization to suit your specific needs. Whether you’re protecting industrial machinery or managing commercial power systems, this relay series enhances safety and operational efficiency.

  • Monitoring Terminals: L1-L2-L3 (3P3W) or L1-L2-L3-N (3P4W)

  • Supply Terminals: L1-L2

  • Voltage Range:

    • 380-400-415-440-480V (P-P)

    • 220-230-240-254-277V (P-N)

  • Rated Supply Frequency: 45Hz-65Hz

  • Measurement Range:

    • 260V-600V (3P3W)

    • 150V-350V (3P4W)

  • Threshold Adjustment: 2%-25% of selected Un

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Description

GRV8 3-Phase Voltage Relay Product Highlight：

  • True RMS Measurement: Provides accurate voltage monitoring for dependable protection.

  • 8-Level Voltage Selection: Easily adjustable via a user-friendly knob.

  • Wide Frequency Range: Measures 45Hz-65Hz, compatible with various power systems.

  • High Accuracy: Voltage measurement precision of less than 1%.

  • LED Indicators: Clear visual feedback on relay status for quick diagnostics.

  • Versatile Models: Options (21-26) with combinations of overvoltage, undervoltage, asymmetry, delay, and phase protection.

Table：

Function code over voltage Under voltage Asymmetry Delay time Phase sequence Phase failure
21 adjustable  available
22 2%…25%,OFF OFF,-25%…-2% 0.1s…10s  available  available
23 2%…25%,OFF OFF,-25%…-2% 8% 0.1s…10s  available  available
24 2%…25%,OFF OFF,-25%…-2% 2%…20%,OFF 2s  available  available
25 2%…20% 0.1s…10s  available  available
26 15% -15% 8% 2s  available  available

Functions-Diagram：

Dimensions(mm)：

 

 

Wiring Diagram：

GRV8-21...26 3 Phase Voltage Relay

Technical parameter 3P3W 3P4W
Function Monitoring 3-phase voltage
Monitoring terminials L1-L2-L3 L1-L2-L3-N
Supply terminals L1-L2 L1-L2
Voltage range 380-400-415-440-480
(P-P)		 220-230-240-254-277
(P-N)
Rated supply frequency 45Hz-65Hz
Measuring range 260V-600V 150V-350V
Threshold adjustment voltage 2%-25%of Un selected
Adjustment of asymmetry threshold 5%-20%
Hysteresis 2%
Phase failure value 70% of Un selected 70% of Un selected
Time delay Adjustable 0.1s-10s,10%
Measurement error ≤2%
Run up delay at power up 0.5s time delay
Konb setting accuracy 10% of scale value
Supply indication green LED
Output indication red LED
Reset time 1s
Output 2×SPDT
Current rating 8A/AC1
Switching voltage 250VAC/24VDC
Min.breaking capacity DC 500mW
Temperature coefficient 0.05%/℃,at=20℃(0.05%℉，at=68℉)
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 0.4Nm
Dimensions 90×18×64mm
Weight 68g-71g
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