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    Picture of 250~800 Amp Automatic Transfer Switch, 3/4 Poles

    250~800 Amp Automatic Transfer Switch, 3/4 Poles

    1 review(s) | Add your review
    SKU: PH-ATS-250800
    $1,276.92
    ● Two models offer multiple rated current options covering 250A up to 800A for diverse load demands. ● Supports adjustable switching delay ranging from 0 to 30 seconds. ● Dual operation modes of automatic and manual switching are available for flexible control. ● Sustained stable performance under nominal 400 V AC mains supply, 50/60 Hz.
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    ⏱️ Delivery: 6-12 days
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    Overview

    PowerHome cost-effective intelligent automatic transfer switch delivers steady dual-power switching performance for 400V AC power systems, with complete current specifications spanning 250A to 800A to cover small and large power load projects. Featuring dual auto/manual operation and reliable double interlock safety design, this microcomputer-controlled ATS boasts simple wiring. Strictly compliant with IEC standards, it offers robust overload and short-circuit resistance while maintaining a compact lightweight build, making it a dependable power backup solution for diverse scenarios.

    250-800 Amp Automatic Transfer Switch Feature

    Feature

    • Dual Interlock Protection: Equipped with mechanical and electrical double interlock to eliminate the risk of simultaneous connection.
    • Microcomputer Intelligent Control: Built-in microprocessor controller realizes automatic detection and seamless switchover between mains and backup power.
    • Flexible Configuration Options: Selectable 3/4-pole layout, integrated/split structure and multiple current specs match various cabinet installation needs.
    • Wide Application Compatibility: Compact, lightweight design delivers long mechanical service life, fitting hospitals, airports, military bases and residential districts.
     

    Details

    1. Main Power Terminals: Wiring interfaces for primary grid power access.
    2. Backup Power Terminals: Ports for alternate power sources such as generators and solar energy storage systems.
    3. Manual Switch Knob: Hand-operated knob to shift power supply if auto function malfunctions.
    4. Load Output Terminals: Output ports to connect all subsequent electrical equipment.
    5. Fixing Mount Holes: Pre-drilled holes for fast mounting within electric cabinets.
    6. Control Interface: Integrated functional control buttons for operation.
    7. LCD Screen: Embedded monitor that displays live dual power operational data.
    250-800 Amp Automatic Transfer Switch Details

    250A-800A Automatic Transfer Switch Dimensions(Unit: mm)

    250-800 Amp Automatic Transfer Switch Dimensions

    Type W W1 L L1 H
    PH-ZMQ2F/L-630/3P 630 575 320 295 195
    PH-ZMQ2F/L-630/4P 715 665 320 295 195
    PH-ZMQ2F/L-800/3P 710 655 335 315 190
    PH-ZMQ2F/L-800/4P 785 725 335 315 190

     

    250A-800A Automatic Transfer Switch Wiring Diagram

    250-800A Automatic Transfer Switch Wiring Diagram

    • The wiring diagram shown above is for reference only, and wiring layouts vary based on distinct product models and functional configurations.
    • In the event of a fire, the firefighting control room will transmit an active EPS signal, which triggers tripping or disconnection of circuit breakers Q1 and Q2.
    • Q1 and Q2 denote circuit breakers.
    • KG stands for wiring terminals.
    • R and N power status indicator lights are external accessories to be supplied by the customer.
    • All components marked with dashed lines need to be prepared by the user separately.

    10-100A Automatic Transfer Switch Wiring Diagram

    • 3P refers to 3-pole circuit breaker and 4P means 4-pole circuit breaker.
    • 24VDC (external) is supplied by the fire control center.
    Specs
    Frame Current 630A 800A
    Rated Operating Current (Optional) 250A, 315A, 350A, 400A, 500A, 630A 630A, 700A, 800A
    Number of Poles (Optional) 3-pole 4-pole 3-pole 4-pole
    Breaking Current 35kA 30kA (250A, 315A, 350A), 50kA (400A, 500A, 630A) 35kA 37.5kA
    Rated Operating Voltage 400V AC
    Insulation Voltage 2500V one minute, no flicker and no breakdown for one minute
    Frequency 50/60Hz
    Delay Time 0-30s (Adjustable)
    Controller Rated Working Voltage 230V AC
    Mechanical Life 5,000 times
    Structural Type (Optional) Integral type (F) or split type (L)
    Environment Altitude ≤2000m
    Ambient Temperature -5℃~+40℃, the 24-hour average temperature does not exceed +35℃
    Relative Humidity RH≤50% @ +40℃; at a lower temperature, it is allowable to have a higher humidity.
    Please pay more attention to the condensation produced on the product surface with the change of humidity.
    Installation No explosive medium, and no medium of gas and dust is enough to corrode and damage the insulation.
    No significant shock and vibration.
    Standards Compliance to IEC6094-6-1, GB14048.11-2008
    Protection Class IP30
    Weight 31kg 34kg 36kg 39kg

    ATS Catalog

    PDF computingPowerHome Automatic Transfer Switch Catalog.PDF

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    FAQ

    Q1: What should I do if my ATS trips while its indicator light stays on?

    The tripping issue falls into two categories. If it’s triggered by vibration during transportation, manually close the molded case circuit breaker, switch the unit to automatic mode and press the reset button. If tripping occurs during operation, inspect the load first. For short-circuit faults, eliminate the short circuit before any manual or automatic switching; switching before troubleshooting risks secondary short circuits and personal injury. For overload tripping, check the total load of connected electrical devices. Replace the molded case circuit breaker if its rated current cannot match the load, as frequent tripping will burn the breaker’s contacts and damage the whole power supply system.

    Q2: How to troubleshoot ATS that fails to switch after power-on with dark controller light or flashing controller power light?

    When the ATS does not operate and the controller light is off, check if all wiring is tight and correctly connected; for 3-pole ATS, connect the neutral wire to the dedicated neutral terminal, reattach broken wires and replace blown fuses. If the controller power light flashes with a buzzer alarm, the causes include overvoltage, loose wiring, phase loss, reversed neutral and phase wires, or defective controllers. Readjust input lines and supply voltage, fasten loose connections, correct reversed wiring, re-plug the controller connector, or replace the controller if the fault persists.

    1 review(s)
    5.0 1
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    Volker | 8/26/2026 6:10 AM
    Works Well for My Generator Setup
    Installed this 800A automatic transfer switch on my off-grid backup generator system. The mechanical and electrical interlocks feel solid, and the adjustable delay works as expected. The manual override is handy when doing maintenance, and the LCD display is easy to read. Build quality is good, and cabinet mounting was straightforward. So far, the power transfer has been reliable.
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