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    Current Monitoring Relay, Over/ Under Current, 1A/2A/5A/8A/16A, AC/DC24V-240V

    The current monitoring relay has 1 SPDT switch, suitable for rated voltage AC/DC 24V-240V range, with undercurrent/over current protection. The current limiting relay has an LED indicator to display the operating status, mainly used to monitor whether the current in the circuit exceeds the preset value and take corresponding measures when it exceeds the preset value. It has a built-in isolated current transformer, and an external current transformer can be connected to expand the monitoring current range. In addition, it can be flexibly adjusted through a potentiometer, with 6 current specifications to choose from.
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    The current monitoring relay is a protection device in the power system, which can monitor the current in the circuit in real-time, such as monitoring the heating conditions in the track switch, heating cables, and the consumption of single-phase motors, to prevent circuit overload, short circuit, and other faults from causing equipment damage or fire and other safety accidents. It is compact, only 18mm wide, and easy to install on the 35mm rail.


    • Adjustable delay 0.1-10 s to eliminate short current peaks, to avoid starting current of motor loads.
    • Flexible adjustment by potentiometer, choice of 6 ranges: AC 0.05-0.5A; AC 0.1-1A; AC 0.2-2A; AC 0.5-5A; AC 0.8-8A; AC 1.6-16A-Power up delay.
    • Possible to use it for current scanning from the current transformer.
    • Universal supply AC/DC 24V-240V.
    • Relay status is indicated by LED.
    • 1-MoDULE, DIN rail mounting.

    Technical Parameters

    Model ATO-GRI8-01 ATO-GRI8-02
    Function Over Current Under Current
    Supply Terminals A1-A2
    Rated Supply Voltage AC/DC 24V-240V
    Rated Supply Frequency 50/60Hz, 0
    Burden Max 25VA
    Supply Voltage Tolerance -15%, +10%
    Current Range 0.05A-0.5A, 0.1A-1A, 0.2A-2A, 0.5A-5A, 0.8A-8A, 1.6A-16A (Optional)
    Current Frequency AC 50Hz
    Max. operating Current 1A, 2A, 5A, 8A, 12A, 22A 
    Current Adjustment Potentiometer
    Time Delay Adjustable 0.1-10s
    Power up Delay Adjustable 0.1-10s
    Supply Indication Green LED
    Setting Accuracy 10%
    Repeat Accuracy <1%
    Temperature Dependence <0.1%/c
    Limit Values Tolerance 5 % (10% for 0.05-0.5A range)
    Hysteresis 5%
    Temperature Coefficient 0.05%/C, at=20°C (0.05%°F, at=68°F)
    Output 1×SPDT
    Current Rating 10A/AC1
    Switching Voltage 250VAC/ 24VDc
    Min. breaking Capacity DC 500mw
    Output Indication Red LED
    Mechanical Life 1×107
    Electrical Life (AC1) 1×105
    Operating Temperature -20°C to +55°C (-4°F to 131°F)
    Storage Temperature -35℃ to +75°C (-22°F to 158R°F)
    Installation 35mm rail installation
    Mounting/ DIN rail Din rail EN/ IEC 60715
    Protection Degree lP40 for front panel/ IP20 terminals
    Operating Position Any
    Overvoltage Cathegory 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)
    Dimensions 90×18×64mm
    Weight 64g
    Standards EN 60255-1

    Wiring Diagram

    Current monitoring relay witing samll

    Current monitoring relay witing 2

     Panel Diagram

    Current monitoring relay panel diagram GRI8

     Function Diagram

    • GRI8-01

     Current monitoring relay function GRI801

    •  GRI8-02

    Current monitoring relay function GRI802

    Dimensions (mm)

    Current monitoring relay dimension

    Tips: How to choose a suitable current monitoring relay?

    The first is the electrical parameters, including rated voltage, rated current, action time release time, etc. These parameters must meet the needs of the actual application scenario. It is best to be able to combine the working environment, and environmental factors such as temperature, humidity, vibration, etc. must be considered to select the size that meets the installation space requirements.

    The second is the relay type, which requires selecting the appropriate relay type and function according to the load type and control requirements, such as AC relay, DC relay, solid-state relay, etc. In addition, some additional functions cannot be ignored. Some relays may have additional functions, such as fault indication, remote control, communication interface, etc.

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