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    50A High Voltage DC Contactor, 12V/24V coil

    High voltage DC contactor, normally open type (SPST-NO), 50 amps rated load current of contact circuit, available with 12V or 24V coils, the connection of contact and coil need to be nonpolarity. It is widely used in the DC high voltage field, such as electric car, wind power generation, DC power supply control system and so on.
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    Delivery date: 6-12 days


    • DC 12-900V rated load voltage of contact circuit.
    • SPST-NO of contact form, 12 volt, 24 volt coil for selecting.
    • Main contact voltage drop at 50A, not above 100mV.
    • The connection of contact and coil need to be nonpolarity.
    • Efficient coil, retentive power is only 2-2.3W, counter electromotive force is 0V.
    • The joint way of the coil is very convenient.
    • The coil has no counter force of electromagnetism.
    • Compare to the similar products, this product is smallest and lightest.


    Basics Model ATO-ADH50
    Dimension 55 x 42 x 62 mm
    Weight 230 g
    Main Contact Parameters Contact Form 1 NO
    Leading-Out M5 internal thread/18 mm
    Rated Load Current 50 A
    Rated Load Voltage 12 – 900V DC
    Maximum Switching Current 500A 320V DC (≥1 times)
    Maximum Switching Power 160 kW
    Rated Electric Life 10,000 times
    Coil Parameters Standard Type Voltage 12V DC 24V DC
    Work Voltage 9~16V 18~32 V
    Max Voltage 16 V 32 V
    Coil Resistance 26 Ω 96 Ω
    Average Holding Current 0.46 A 0.25 A
    Steady State Power 5.5 W 6 W
    Actuation Time ≤25 ms
    Release Time ≤10 ms
    Bounce Time ≤5 ms
    Mechanical Specification Stability 196 m/s2 (20G)
    Strength 490 m/s2 (50G)
    Vibration 80 ~2000Hz 98m/s2 (20G)
    IP Grade IP67
    Environment Operating Temperature -40℃~85℃
    Operating Humidity 5~95% RH

    Installation Diagram (Unit: mm)
    High voltage 50a dc contactor dimension 1
    high voltage 50a dc contactor dimension 2High Voltage DC Contactor Coil Schematic
    high voltage dc contactor coil-schematicTips:
     Fusion welding of the contactor due to electric shock, how to solve?

    Possible causes of the fault:

    • short circuit of contactor on the load side.
    • Overload use of contactor contact.
    • There’s a foreign body or a metal particle on the surface of the contact.
    • Pressure of the contact spring is too small.
    • Poor contact of contactor's lines, which makes the contactor repeatedly pull in and release at a moment.

    Maintenance method:

    1. Power off at first, separate the welding contacts with a screwdriver, correct the contact surface and eliminate the short-circuit fault.
    2. Replace with a large capacity and high quality contactor.
    3. Smooth the contact surface with a steel file and remove foreign bodies.
    4. Readjust the spring pressure.
    5. Check the bad contacts of the coil control loop of the contactor, reconnect the loop or replace electrical components, ensure a good on-off situation.
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