QNZ2-250H Micro-power High-voltage DC Contactor (Aux. Contacts Opt.)

1. Application

    The QNZ2-H 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, RoHS, REACH.

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

QNZ2-H Overload Current vs. Time Curves

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

QNZ2-250H Outline and Mounting Dimensions

QNZ2-250H（10/01）Outline and Mounting Dimensions

7. Wiring Diagrams

        QNZ2-H                 QNZ2-H10                QNZ2-H01

       QNZ2-HB                 QNZ2-H10B                 QNZ2-H01B

8. Ordering Information

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

Examples:

QNZ2-350H10 DC24V 100 units; Meaning: 100 units of high-voltage DC contactor, main contact 1NO, current 350A, with one normally open auxiliary contact, coil voltage DC24V. QNZ2-350H DC24V B 100 units; Meaning: 100 units of high-voltage DC contactor, main contact 1NC, current 350A, coil voltage DC24V. 

9. Usage Precautions

◆ The product coil is polarized (indicated by red and black wires). The main circuit is non-polarized. ◆ 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 .

◆ Main contact screw and nut specifications: For all QNZ2-150H/200H/250H/300H/350H/400H models: GB97.1-Φ8 flat washer, GB93-Φ8 spring washer, GBT6170-M8 hex nut. Suitable for busbar thickness 3mm–5mm. For all QNZ2-450H/500H models: GB97.1-Φ10 flat washer, GB93-Φ10 spring washer, GBT6170-M10 hex nut. Suitable for busbar thickness 3mm–5mm. ◆ Coil lead-out form (default without terminals, can be customized per customer request): For all QNZ2-150H/200H/250H/300H/350H/400H models: UL3321 22# red/black wires, default length 400mm. For all QNZ2-450H/500H models: UL3321 22# red/black wires, default length 400mm. ◆ Auxiliary contact lead-out form (default without terminals, can be customized per customer request): For all QNZ2-150H/200H/250H/300H/350H/400H models: UL1332 22# black wire, default length 400mm. For all QNZ2-450H/500H models: UL1332 22# black wire, default length 400mm. ◆ Do NOT forcibly bend wires or busbars after tightening the product's mounting screws, to prevent damage to the contactor and ensure its normal use.