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    300A High Voltage DC Contactor, 12V/24V coil

    5 out of 5 based on 1 reviews | Write a review
    The ATO-ADH300 contactor has been designed for DC loads, particularly for DC high voltage field, operating voltage up to 900V. 300A rated load current of contact circuit, normal open (SPST-NO) main contacts with silver alloy tips, which are weld resistant, hard wearing and have excellent conductivity.
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    ATO high voltage DC contactor, rated load current of 300 amps, available 12V or 24V energy saving coil. It can work in the hostile environment, coil and contact can not be oxidized and polluted.


    • DC 12-900V rated load voltage of contact circuit.
    • SPST-NO (normally open type) of contact form, 12 volt, 24 volt coil for selecting.
    • Main contact voltage drop at 300A, 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-ADH300
    Dimension 80 x 65 x 74 mm
    Weight 480 g
    Main Contact Parameters Contact Form 1 NO
    Leading-Out M10 Internal thread
    Rated Load Current 300 A
    Rated Load Voltage 12 – 900V DC
    Maximum Switching Current 2000A 320V DC (≥1 times)
    Maximum Switching Power 640 kW
    Coil Parameters Standard Type Voltage 12/24V DC
    Work Voltage 8~36V
    Max Voltage 36 V
    Coil Resistance 3.1Ω
    Average Holding Current 0.14 A
    Steady State Power 1.7~2 W
    Actuation Time ≤30 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 150a dc contactor dimension 1
    high voltage 150a dc contactor dimension 2High Voltage DC Contactor Coil Schematic
    high voltage dc contactor coil schematic


    300A High Voltage DC Contactor Details

    Tips: How to examine the contactor with a multimeter

    1. Test the coil with the ohm gear of multimeter, check if the coil is shorted, if it is, the coil is broken.
    2. Test whether the normally closed auxiliary contact is breakover with the ohm gear of multimeter. If the contact doesn't contact well, the measuring resistance will be great. If the auxiliary contact is connected with load, the voltage will not reach the rated voltage when measuring.
    3. Press the main contact with your hand to check if the contactor mechanism gets stuck or not.
    4. Power on the contactor coil directly to check if the contactor pulls in or not.
    5. After the contactor pulls in, test with a multimeter to check if the normally open auxiliary contact is breakover.
    Existing reviews of 300A High Voltage DC Contactor, 12V/24V coil
    300A high voltage DC contactor coil output range
    For your DC contactor model: With coil in 24VDC, I would like to know the range for DC input in the coil?
    From: Jeremiah | Date: 08/04/2021
    Was this review helpful? Yes No (0/0)
    ATO Responded
    The tolerance of DC coil voltage is 20%. Also, it is stated on web site cotactor model specs.
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