1. Application
The QNZ-A series DC contactors are designed for use in inverters, soft starters, or other similar DC-20 load applications, serving as bypass isolation switches.
Product Compliance Standards: IEC/EN 60947-4-1, GB/T 14048.4
Product Certifications: CCC, CE, TUV, UL, RoHS
2. Coding
Q N Z – □ A □
1 2 3 4 5
Figures | Coding |
1 | Enterprise Code: QN represents Nanjing Quanning Electric Co., Ltd. |
2 | Z: DC Contactor |
3 | Basic Specification Code: the rated current (Ie) |
4 | A indicates normally open (NO) main contacts |
5 | Coil Voltage (Us) |
3. Key Points
Compact size, lightweight, low power consumption, and high reliability.
High insulation performance, withstanding power frequency voltage of 3500V.
Coil terminals offer two connection options: fixed screw terminals or flexible lead wires.
Silver alloy contacts ensure reliable connection and low contact temperature rise.
Utilizes a single-coil structure.
Capable of handling 5 times overload (5Ie for 10 seconds).
Contacts, coil, and magnet are sealed within the housing, preventing dust ingress and allowing use in harsh environments.
Complies with the EU RoHS environmental directive and national energy-saving and environmental protection requirements.
4. Operating and Installation Conditions
Ambient Temperature: -40°C to +85°C.
Ambient Humidity: Maximum relative humidity of 85%.
Altitude: For installation altitudes exceeding 2000 meters, derate by 5% for every 1000-meter increase. Maximum allowable altitude is 5000 meters.
Vibration: Sinusoidal sweep vibration at the mounting point: 5–150Hz (Amplitude: 25/f for 5–20Hz; 250/f² for 20–150Hz).
Shock Acceleration: 30 m/s².
Pollution Degree: Degree 3.
Mounting Orientation: Horizontal or vertical.
Mounting Method: Screw mounting.
Applicable Duty Types: Uninterrupted duty and intermittent periodic duty.
5. Technical Parameters
This product series complies with the standards: IEC/EN 60947-4-1, GB/T 14048.4.
Specifications Parameters | QNZ-500A |
Number of Contacts | 1P（Normally Open） |
Rated Insulation Voltage Ui(V) | 1500 |
Rated Insulation Voltage Ui（VDC） | 1500 |
Rated Operational Voltage Ue（VDC） | 48 |
Rated Operational Current Ie（A）DC-1 | 500 |
Contact Voltage Drop Ud（mV） | ≤95 |
Pole Impedance Z（mΩ） | ≤0.4 |
Minimum Load for Make | 24V 200mA |
Coil | Coil Voltage Us（VDC） | 24、48 |
Pick-up Voltage（VDC） | 0.85Us～1.10Us |
Drop-out Voltage（VDC） | 0.10Us～0.75Us |
Holding Current（A） | 0.35～0.4（DC24V）、0.14～0.2（DC48V） |
Holding Current（W） | 7.6～9.2（DC24V）、7.5～10（DC48V） |
Electrical Life | DC-1，Ue，Ie （x10^4 operations） | 0.6 |
Operating Frequency（operations/hour） | 1200 |
Mechanical Life (x10^4 operations) | 10 |
Overload Performance（A） | 1.5Ie/30min；3Ie/1min；5Ie/10s；8Ie/1s； |
Operating Times | Pick-up Time（ms） | 20～40 |
Release Time（ms） | 5～15 |
Main Contact Wire or Busbar Cross-section（mm2） | 300 |
Main Contact Terminal Tightening Torque （N.m） | M10 Bolt：10.0～15.0 |
Insulation Resistance (MΩ) | ≥30（1500VDC） |
Dielectric Strength | Between coil and contacts | 3500V AC, 1 Min, No breakdown or flashover, leakage current ≤5mA |
Between open contacts | 3500V AC, 1 Min, No breakdown or flashover, leakage current ≤5mA |
Temperature Rise | Coil (at Us) | ≤85K |
Terminals (at Ie) | ≤65K |
Enclosure | ＜60K |
Magnet Wire | Temperature Resistance | ≤180℃ |
Insulation Class | Class H |
Withstand Voltage (Wire to ground) | 1000V AC/1Min, No breakdown or flashover, leakage current ≤5mA |
Weight (kg) | Approx. 0.75 |
6. Outline and Installation Dimensions
QNZ-500A Bent Bracket, Lead Wire
QNZ-500A Bent Bracket, Screw Terminals
QNZ-500A Straight Bracket, Lead Wire
QNZ-500A Straight Bracket, Screw Terminals
7. Connection Diagram
QNZ-A Series(without magnetic blowout) QNZ-A Series（with magnetic blowout）
8. Ordering Information
When placing an order, please specify:
■ Contactor model and name;
■ Coil voltage;
■ Order quantity;
■ Special requirements;
Q N Z – □ A □
1 2 3 4 5
Figures | Coding |
1 | Enterprise Code: QN represents Nanjing Quanning Electric Co., Ltd. |
2 | Z: DC Contactor |
3 | Basic Specification Code: the rated current (Ie) |
4 | A indicates normally open (NO) main contacts |
5 | Coil Voltage (Us) |
Examples:
QNZ-200A DC24V Bent Bracket, Screw Terminals 100 units;
100 units DC contactor, one normally open main contact, 200A current, bent bracket mounting, screw terminals, coil voltage DC24V.
QNZ-400A DC48V Straight Bracket, Lead Wire 500mm 100 units;
100 units DC contactor, one normally open main contact, 400A current, straight bracket mounting, 500mm lead wire, coil voltage DC48V.
9. Precautions for Use
◆ The product coil is non-polarized. The main circuit with magnetic blowout is polarized (L1 is positive, L2 is negative); without magnetic blowout, it is non-polarized. The positive and negative terminals must not be reversed, as reversal can affect the load-breaking life.
◆ When using more than one connection wire at the power terminal, ensure the main power conductor is closest to the contactor's main circuit connection point, with smaller current wires on top, followed by 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 (see table).
M3 Screw: 0.5～0.8 N.m | M3.5 Screw: 0.8～1.2 N.m | M4 Screw: 1.2～1.8 N.m |
M5 Screw: 2.0～3.0 N.m | M6 Bolt: 3.0～4.5 N.m | M8 Bolt: 6.0～9.0 N.m |
M10 Bolt: 10.0～15.0 N.m | M12 Bolt: 14.0～21.0 N.m |
|
◆ Main contact wire or busbar cross-sectional area (see table).
50 Amps: 10mm² | 100 Amps: 35mm² | 200 Amps: 95mm² |
300 Amps: 185mm² | 400 Amps: 240mm² | 500 Amps: 300mm² |
600 Amps: 400mm² | 800 Amps: 500mm² |
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◆ Prohibit forcibly bending the wire or busbar after installing and tightening the screws, to prevent damage to the contactor and ensure its normal operation!
