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SJKQ2-ATS-Switch-(1).jpg
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China SJKQ2 Dual Power Automatic Transfer Switch - Reliable Factory Suppliers for Critical Backup Systems

Introducing the SJKQ2 ATS Automatic Transfer Switch, your ultimate solution for reliable power transfer in critical applications. This powerful device accommodates loads ranging from 100A to 3200A at AC 400V, featuring impressive insulation capabilities of 500-800V and a robust impulse withstand rating of 6-8kV. Manufactured in China, our ATS is designed to operate seamlessly in harsh environments, being effective at altitudes of up to 2000m and temperatures between -5°C to +40°C, With a swift switching time of under 3 seconds and AC-33iB performance, the SJKQ2 ensures dependable short-time withstand currents of up to 16kA, suitable for Pollution Degree 3/Category III installations. As a leading supplier of automatic transfer switches, our products guarantee uninterrupted power supply through seamless source transitions, making it an ideal solution for industrial and commercial backup systems that demand fail-safe operations. Trust in our factory expertise to deliver top-quality ATS solutions tailored to your needs
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    Product Details

    Type Designation
    SJKQ2-Dual-Power-Automatic-Transfer-Switch-4
    1 Manufacturer Code
    2 Auto-Transfer Function
    3 Derivative Code: (): NCCB; W Compact Type; W1: Economy Type; W2: Smart Type (Undervoltage / Phase-Loss / Off / Fire Protection)
    4 Function Code: R – Grid-to-Grid (Optional); F – Grid-to-Generator; M – Terminal Type (Optional);
    Y – Integrated Smart Type (Off / Fire Protection / Undervoltage); N – Split Smart Type (Off / Fire Protection / Undervoltage)
    5 Frame Size Current
    6 Number of Poles
    7 Rated Current (In)
    Technical Parameters
    Rated current 100A 160A 250A 630A 1600A 3200A
    Rated voltage AC 400V
    Rated Insulation Voltage (Ui) 500V 800V
    Rated Impulse Withstand Voltage (Uimp) 6KV 8KV
    Rated Short-time Withstand Current (Icw) 5KA 10KA 16KA
    Switch Time <3s 5s
    Rated Control Voltage AC 230V
    Ambient Temperature The upper limit is +40°C, the average value does not exceed +35°C within 24 hours; the lower limit is -5°C.
    Altitude The altitude of the installation site does not exceed 2000m.
    Installation Environment No explosive atmosphere environment. No rain intrusion environment.
    Power Supply Voltage Deviation <85% Ue
    Using Category AC-33iB
    Installation Category II
    Pollution Degree 3
    Product Display
    SJKQ2-Dual-Power-Automatic-Transfer-Switch-(1)
    SJKQ2-Dual-Power-Automatic-Transfer-Switch-(2)
    SJKQ2-Dual-Power-Automatic-Transfer-Switch-(3)
    Main Circuit Wiring Diagram & External Power ON Indicator
    SJKQ2-3
    • 1. Normal Neutral Line
    • 2. Normal Source ON Indicator
    • 3. Alternate Neutral Line
    • 4. Alternate Source ON Indicator
    Terminal Diagram

    If the user requires fire protection and power generation functions, please consult with the manufacturer for customization. The wiring diagram is as follows:

    SJKQ2-4
    Outline and Installation Dimensions
    SJKQ2-5

    Installation Dimensions

    SJKQ2 Automatic Power Transfer Switch Installation Dimensions

    Model / Dimensions W W1 L L1 H
    SJKQ2-100/3P 290 253 205 186 120
    SJKQ2-100/4P 320 282 205 186 120
    SJKQ2-225/3P 330 296 215 195 140
    SJKQ2-225/4P 365 333 215 195 140
    SJKQ2-400/3P 465 410 310 285 190
    SJKQ2-400/4P 508 455 310 285 190
    SJKQ2-630/3P 528 478 318 295 195
    SJKQ2-630/4P 588 535 318 295 195
    SJKQ2-800/3P 608 556 334 310 190
    SJKQ2-800/4P 678 626 334 310 190
    SJKQ2-1250/4P 695 642 391 365 288
    SJKQ2-1600/4P 695 642 391 365 288
    Frequently Asked Questions
    Q What is the SJKQ2 Dual Power Automatic Transfer Switch used for?
    The SJKQ2 is an Automatic Transfer Switch (ATS) designed to automatically switch between two power sources — typically grid-to-grid or grid-to-generator — ensuring uninterrupted power supply to critical loads when the primary source fails.
    Q What rated current options are available for the SJKQ2?
    The SJKQ2 is available in rated current options of 100A, 160A, 250A, 630A, 1600A, and 3200A, making it suitable for a wide range of industrial and commercial power distribution applications.
    Q What is the switching time of the SJKQ2 Automatic Transfer Switch?
    For models rated at 100A–250A, the switching time is less than 3 seconds. For models rated at 630A and above, the switching time is 5 seconds, ensuring a fast and reliable power transfer response.
    Q Does the SJKQ2 support fire protection and power-off functions?
    Yes. The SJKQ2 W2 smart type supports Undervoltage, Phase-Loss, Power-Off, and Fire Protection functions. For fire protection and power generation customization, users should consult the manufacturer directly for the appropriate wiring configuration.
    Q What are the installation environment requirements for the SJKQ2?
    The SJKQ2 should be installed in environments without explosive atmospheres and without rain intrusion. The ambient temperature upper limit is +40°C (average not exceeding +35°C within 24 hours), the lower limit is -5°C, and the installation altitude should not exceed 2000 meters.
    Q What pole configurations are available for the SJKQ2 models?
    The SJKQ2 is available in both 3-pole (3P) and 4-pole (4P) configurations across various frame sizes from 100A to 1600A, providing flexible options for three-phase and three-phase-plus-neutral power distribution systems.