QNZ2-50HV High-voltage DC Contactor

1. Application

    The QNZ2-HV series micro-power high-voltage DC contactors are suitable for circuits with a working voltage up to 1500V under DC-1 load conditions. They are primarily used in DC high-voltage applications such as electric vehicles, energy storage, battery packs, high-voltage electrical control boxes, charging piles, photovoltaics, and electric boats.     Compliance Standards: IEC/EN 60947-4-1, GB/T 14048.4.     Product Certifications: CCC, CE.

2.Coding

3.Key Points

▲ Coil with ultra-low power consumption technology, featuring high efficiency, energy saving, and surge protection. The coil itself does not generate heat. ▲ Non-polarized contacts, capable of making and breaking load current at 1500VDC. ▲ Arc-proof hermetic structure. The arc extinguishing chamber is filled with inert gas, ensuring high safety. ▲ Rare earth strong magnetic arc extinguishing, long electrical lifespan, strong anti-welding performance, safe and reliable. ▲ Strong resistance to shock and vibration. High contact pressure, silver alloy contacts ensure reliable connection, low contact temperature rise, and strong overload capacity. ▲ Sealed structure design, Protection Class IP67, offering strong dustproof and waterproof performance. ▲ High insulation performance, withstands 3500V power frequency voltage.

4. Operating and Installation Conditions

▲ Ambient Temperature: -40°C to +85°C. ▲ Ambient Humidity: Maximum relative humidity 85%. ▲ When the installation site altitude exceeds 2000 meters, derate by 5% for every additional 1000 meters. Maximum altitude should not exceed 5000 meters. ▲ Sinusoidal sweep frequency vibration at the mounting point: 10–500 Hz (Frequency 10–50 Hz, Amplitude 2.5mm; 50–200 Hz, Amplitude 0.16mm; 200–500 Hz, Acceleration 50 m/s²). ▲ Shock Acceleration: 500 m/s², half-sine pulse: 11ms. ▲ Pollution Degree: Pollution Degree 3. ▲ Installation Orientation: Horizontal or vertical. ▲ Mounting Method: Screw mounting. ▲ Applicable Duty Cycle: Uninterrupted duty, Intermittent periodic duty. 

5. Technical Parameters

This series complies with standards: IEC/EN 60947-4-1, GB/T 14048.4.

QNZ2-HV Overload Current vs. Time Curves

6. Outline and Mounting Dimensions (Same for NO and NC Types)

QNZ2-50HV (Lead Wire) Outline and Installation Dimensions

QNZ2-50HV (Terminals)  Outline and Installation Dimensions

7. Wiring Diagrams

QNZ2-40HV/50HV/60HV Models:

Other Models:

         QNZ2-HV                 QNZ2-H10V             QNZ2-H01V

        QNZ2-HVB                QNZ2-H10VB             QNZ2-H01VB  

8. Ordering Information

When placing an order, please specify:        ■ Contactor model and name;        ■ Coil voltage;        ■ Order quantity;        ■ Special requirements; 

Example:

QNZ2-400H10 DC24V V 100 units; 100 units of high-voltage DC contactors, V model, one normally open main contact, 400A current, with one normally open auxiliary contact, coil voltage DC24V. QNZ2-400H DC24V VB 100 units; 100 units of high-voltage DC contactors, V model, one normally closed main contact, 400A current, coil voltage DC24V.

9. Usage Precautions

◆ Main circuit is polarity-free; product coil has polarity (except QNZ2-40HV).◆ The energy-saving coil has a relatively large starting current at initial operation, lasting between 100–120ms depending on the product's characteristics. Therefore, the driving power for the contactor must be greater than the coil power, and the operating frequency must not exceed the rated value. Otherwise, it may affect the normal starting of the DC contactor or even burn out the energy-saving module, rendering the contactor inoperative. ◆ The product has a built-in coil energy-saving module; no additional PWM or other energy-saving modules are required. If PWM pulse signals are still used to control the coil, the PWM output voltage must be set to 100%, otherwise it may affect the reliable operation of our contactors. Step-type power supply mode is recommended. ◆ When using more than one connection wire at a power terminal, ensure the main power wire is closest to the contactor's main circuit connection point, followed by smaller current wires on top, then the washer, spring washer, and nut. Incorrect connection order or loose connections can cause severe overheating and melt the cable insulation.

    ◆ The tightening torque for screws and bolts used with the contactor should be controlled within the specified ranges below .

    ◆ Main contact wire or busbar cross-sectional area .

◆ Specifications for screws and nuts used with main contacts: Recommended for all QNZ2-40HV/50HV/60HV models: GBT 9074.13-M4X8 cross combination bolt, compatible with busbar thickness 1mm~2mm. Recommended for all QNZ2-100HV/150HV/200HV/250HV/300HV models: GBT 9074.13-M6X12 cross combination bolt, compatible with busbar thickness 2mm~3mm. Recommended for all QNZ2-350HV/400HV models: GBT 9074.13-M6X12 cross combination bolt, compatible with busbar thickness 2mm~4mm. ◆ Coil lead form: All QNZ2-40HV/50HV/60HV models: UL1332 22# black wire, default length 400mm. All QNZ2-100HV/150HV/200HV/250HV/300HV (Lead Wire) models: UL3321 22# red/black wire, default length 400mm. All QNZ2-100HV/150HV/200HV/250HV/300HV (Terminals) models: Compatible coil terminals: Tianhai 0435 series, Yazaki 7283-1020. All QNZ2-350HV/400HV (Lead Wire) models: UL3321 22# red/black wire, default length 400mm. All QNZ2-350HV/400HV (Terminals) models: Compatible coil terminals: Tianhai 0435 series, Yazaki 7283-1020. ◆ Auxiliary contact lead form: All QNZ2-40HV/50HV/60HV models: No auxiliary contacts. All QNZ2-100HV/150HV/200HV/250HV/300HV models: UL1332 22# black wire, default length 400mm. All QNZ2-350HV/400HV models: UL1332 22# black wire, default length 400mm. ◆ It is prohibited to forcibly bend the wires or busbars after installing and tightening the screws, as this may damage the contactor and affect its normal use!