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    Asymmetric Cycler Timer Relay, SPDT, AC/DC 12V-240V

    The asymmetric cycler time delay relay has 1×SPDT/ 2×SPDT these two output types. It has a separate delay setting function and can be set in an ultra-wide delay range of 0.1 seconds to 100 days, which can automatically switch the circuit opening and closing state in two different time intervals to achieve intermittent operation of the equipment. In addition, by short-circuiting S-A1, different working modes can be switched. Timed or intermittent fine control and protection of equipment in the power system can be achieved.
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    The asymmetric cycler time delay relay is an electrical control device that can be easily installed on a DIN rail. It has an LED light to display the device status and has a 10-position delay range to choose from. It automatically detects faults and can quickly cut off the power supply to the faulty part to prevent the expansion of the fault. It improves the reliability and stability of the power system and reduces the workload of operators.


    • 2 time functions:
    • Cycler beginning with pulse
    • Cycler beginning with pause
    • Function choice is done by an external jumper of terminals S-A1.
    • Time scale 0.1 s - 100 days divided into 10-time ranges: (0.1 s - 1 s/ 1 s - 10 s/ 0.1 min - 1 min/ 1 min - 10 min/ 0.1 hrs - 1 h/ 1 hrs - 10 hrs/ 0.1 day - 1 day/ 1 day - 10 days/ 3 days - 30 days/ 10 days - 100 days).
    • Relay status is indicated by LED.
    • 1-MODULE, DIN rail mounting.

    Mode and Connotation

    Asymmetric cycler timer relay front mode connotation

    Technical Parameters

    Model ATO-GRT8-S1 ATO-GRT8-S2
    Function Asymmetric cycler time relay
    Supply Terminals A1-A2
    Voltage Range AC/DC 12V-240V (50-60Hz)
    Burden AC 0.09-3VA/ DC 0.05-1.7W
    Supply Voltage Tolerance -15%;+10%
    Supply Indication Green LED
    Time Ranges 0.1 s - 10 days
    Time Setting Potentiometer
    Time Deviation 10% - mechanical setting
    Repeat Accuracy 0.2% - set value stability
    Temperature Coefficient 0.05%/°C, at=20°C (0.05%°F,at=68°F)
    Output 1×SPDT 2×SPDT
    Current Rating 1×16A (AC1) 2×16A (AC1)
    Switching Voltage 250VAC/24VDC
    Min. breaking Capacity DC 500mW
    Output Indication Red LED
    Mechanical Life 1×107
    Electrical Life (AC1) 1×105
    Reset Time Max. 200ms
    Operating Temperature -20°℃ to +55℃ (-4F to 131°F)
    Storage Temperature -35°℃ to +75°℃ (-22°F to 158°F)
    Mounting/ DIN Rail Din rail EN/ IEC 60715
    Protection Degree IP40 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 90mm×18mm×64mm
    Weight 1×SPDT: 62g 2×SPDT: 82g
    Standards EN61812-1, IEC60947-5-1

    Wiring Diagram

     Asymmetric cycler timer relay wiring diagram

    Functions Diagram

    • Cycler beginning with pulse

    Cycler beginning with pulse

    • Cycler beginning with pause (jumper A1-S)

    Cycler beginning with pause

    Dimensions (mm)

     Asymmetric cycler timer relay dimensions

    Tips: In terms of working principle, the asymmetric cycler timer relay can achieve the following functions:

    • Through the preset action time and release time, the circuit can be timed and controlled, such as turning on or off certain equipment at a specific time every day.
    • When a fault occurs in the power system, the relay can act according to the predetermined program, cut off the fault circuit, and protect the safety of the equipment and system.
    • In some application scenarios, the equipment may need to work intermittently to prevent overheating or other potential problems. The relay can perform switching operations within the set time interval.
    • The relay can control the circuit according to the set cycle mode, such as repeatedly opening and closing.
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