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    300A DC Contactor, 12V/24V/48V/220V

    300A DC contactor with high-performance quality, contact form can be selected as normally open or normally closed. This 300 amps contactor is available in coil voltage 12V, 24V, 48V, 220V, with low cost and manufacturer direct sale.
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    Delivery date: 2-12 days

    High performance 300A DC contactor with normally open or normally closed contact options. This DC contactor is available at low cost direct from the manufacturer and is available in coil voltages of 12V, 24V, 48V and 220V. Single coil 300A DC contactor is suitable for switch control of system circuits such as electric toy cars, battery cars, cleaning cars, automobile air conditioners, communication power supplies, and automobile air conditioners.


    • 300A DC contactor has the characteristics of small size, large load capacity, long service life and simple maintenance, and is very popular among users.
    • 300 amps contactor complies with the requirements of the ministry standards JB2286-78, JB3974-85, YD/585-92, YD/T512-92. It has been tested in the factory and by relevant testing units and meets the requirements of the ministry standards. It has been used by users for many years to satisfy users to the maximum extent. Needed, reliable quality.
    • Single coil 300A DC contactor are suitable for electric forklifts, battery trucks, tractors, excavators, brick making machines, cleaning vehicles, automotive air conditioners, communication power supplies, switch control of electronic control circuits of uninterruptible power supplies, electroplating power supplies and other systems.


    Model ATO-SZJ300A-D ATO-SZJ300A
    Contact Form Normally Closed Normally Open
    Coil Rated Voltage (DC V) 12V, 24V, 36V, 48V, 60V, 72V, 84V, 120V , 150V, 220V 12V, 24V, 36V, 48V, 60V, 72V, 84V, 120V, 150V
    Contact Rated Voltage (DC V) ≤80V
    Contact 48V Circuit Rated Load Current (DC-1) 300A
    Main Contact Contact Coltage Drop Under 100A Load ≯80mV
    Cooling pull-in voltage (V), (20±5)℃ ≯70%
    Cooling release operating voltage (V), (20±5)℃ ≯35%, ≮5% ≯40%, ≮5%
    40℃ Coil Operating Voltage Range 0.8-1.2Us
    Power-on Action Time 10ms 15ms
    Power-off Release Time 20ms 10ms
    Maximum Bounce Time of Contact Connection 10ms
    Maximum Bounce Time of Contact Disconnection 3ms
    Insulation Resistance 20MΩ
    Dielectric Strength 50Hz/60Hz 1000VAC 1minute
    Maximum Breaking Capacity of Main Contact (Power on for 5ms) 1000A/5ms at 48V/DC
    Coil Power Consumption (W) 7-15 Start: 120-170, Hold: 4-10
    Coil Temperature Rise (K) ≤80 ≤40
    Terminal Temperature Rise (K) ≤65
    Electrical Life 20000times
    Mechanical Life 300,000 times
    Work Specifications Continuous
    Contact Material Silver alloy
    Load Terminal Type M8 screw
    Coil Terminal Type M4 screw
    Auxiliary Contact Rated Load (Optional) 2A/48VDC, 5A/24VDC, one on and one off 2A/48VDC, 5A/24VDC
    Testing Agency Certification CCC, CE, FCC, RoHS

    Load Characteristic Curve

    300A DC contactor estimated electric life300A DC contactor estimated contact performance

    Installation Dimension Diagram

    300A DC contactor m installation dimension drawing

    300A DC contactor x installation dimension drawing

    300A DC contactor installation dimension drawing

    SZJ300A-D Wiring Diagram & Coil Temperature Rise Curve Graph

    Normally closed wiring diagram

    One way is normally closed (SPST 1NC)
    1 and 2 are contact terminals
    A1 and A2 are coil terminals

    300A DC contactor szj-d temperature rise curve graph

    SZJ300A Wiring Diagram & Coil temperature Rise Curve Graph

    300A DC contactor wiring diagram

    One way is normally open (SPST 1NO)

    1 and 2 are contact terminals
    A1 and A2 are coil terminals
    L1 is the take-off winding L2 is the holding winding

    300A DC contactor szj coil temperature rise curve graph

    Mechanical Capabilities and Usage Environment

    Contact Terminal M8 Tightening Torque (Nm) ≯9.0 is appropriate
    Coil Lead-out M4 Tightening Torque (Nm) ≯1.2 is appropriate
    Ambient Temperature -25~+70℃
    Relative Humidity +20℃ 98%
    Vibration Frequency at Fixed Location 3G, 1~50Hz, amplitude 0.5mm
    Impact (60~100) times/min, acceleration ≤4g
    Altitude 2000 meters
    Installation Direction Arbitrary
    Protection Level IP40 (equivalent to IEC60947)

    Tips: The difference between DC contactor's single coil and double coil

    • The starting power of the DC contactor's single coil is as small as the holding power, and the pull-in voltage range is wider. For example, a DC contactor with a 48V coil can pull in normally at a voltage of 41V, but the temperature rise is faster than that of a double coil.
    • The dual-coil coil of DC contactor has a large starting power, a small holding power, and a narrower voltage pull-in range. For example, a DC power contactor with a 48V coil requires a minimum pull-in voltage of 43V, but the temperature rise is slower than that of a single coil.
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