Rated operational current (A): 400 Rated operational voltage (V DC): 48 Rated insulation voltage (V DC): 1500 Coil control voltage (V): DC12/24/48/72/144 Coil operating power consumption (W): 5～7（DC24V）、4.8～7（DC48V）Coil connection method: Terminal pin / External lead Electrical life (operations): 1×10⁴ Mechanical life (operations): 10×10⁴ Mounting method: Straight plate / Bent plate Auxiliary contacts: Null

Product Description

1. Application

The QNZ1-A series DC contactor is suitable for use as a bypass isolation switch in frequency converters, soft starters, or other similar DC-20 loads.

2. Coding

Q N Z 1 – □ A □

1 2 3 4 5 6

Figures	Coding
1	Enterprise Code: QN represents Nanjing Quanning Electric Co., Ltd.
2	Z: DC Contactor
3	1： Product series
4	Basic Specification Code: the rated current (Ie)
5	A indicates normally open (NO) main contacts
6	Coil Voltage (Us)

3. Key Points

▲ Dual Contact Bridge Structure, silver alloy contacts ensure reliable contact and low contact temperature rise. ▲ High Insulation Performance, withstand voltage up to 3500V AC. ▲ Complies with the EU RoHS Environmental Directive, and meets national energy-saving and environmental protection requirements. ▲ Two Coil Connection Methods Available: fixed screw terminal or flexible lead wire. (Note: Models 600-800A are equipped with lead wire only.)

4. Operating and Installation Conditions

▲ Ambient Temperature: -40°C to +85°C ▲ Ambient Humidity: Maximum relative humidity 85% ▲ Altitude Derating: For installations above 2000 meters, derate by 5% per additional 1000 meters, up to a maximum altitude of 5000 meters. ▲ Sinusoidal Sweep Vibration at Mounting Point: 5–150Hz (5–20Hz, amplitude 25/f; 20–150Hz, amplitude 250/f²) ▲ Shock Acceleration: 30 m/s² ▲ Pollution Degree: Degree 3 ▲ Mounting Orientation: Horizontal or vertical ▲ Mounting Method: Screw mounting ▲ Applicable Duty Cycles: Continuous duty, intermittent periodic duty

5. Technical Parameters

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

Specifications Parameters		QNZ1-400A
Contact Configuration		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		400
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）	0.21～0.28（DC24V）、0.1～0.14（DC48V）
	Holding Current（W）	5～7（DC24V）、4.8～7（DC48V）
Electrical Life	DC-1，Ue，Ie （x10⁴ operations）	1
	DC-1, at Ue, 3Ie (Operations)	100
Operating Frequency（operations/hour）		1200
Mechanical Life (x10⁴ 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）		240
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	H级
	Withstand Voltage (Wire to ground)	1000V AC/1Min, No breakdown or flashover, leakage current ≤5mA
Weight (kg)		Approx. 0.5

6. Outline and Installation Dimensions

QNZ1-400A Bent Bracket, Screw Terminals

QNZ1-400A Bent Bracket, Lead Wire

QNZ1-400A Straight Bracket, Screw Terminals

QNZ1-400A Straight Bracket, Lead Wire

QNZ1-400A No Bracket, Screw Terminals

QNZ1-400A No Bracket, Lead Wire

7. Connection Diagram (Polarity must not be reversed)

QNZ1-A Series(without magnetic blowout) QNZ1-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 1 – □ A □

1 2 3 4 5 6

Figures	Coding
1	Enterprise Code: QN represents Nanjing Quanning Electric Co., Ltd.
2	Z: DC Contactor
3	1： Product series
4	Basic Specification Code: the rated current (Ie)
5	A indicates normally open (NO) main contacts
6	Coil Voltage (Us)

Example:

QNZ1-200A Bent Bracket, Screw Terminals DC24V 100 units 100 units of DC contactors, one normally open main contact, 200A current, bent bracket mounting, screw terminals, coil voltage DC24V. QNZ1-400A Straight Bracket, Lead Wire 500mm DC48V 100 units 100 units of DC contactors, 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), while the main circuit without magnetic blowout is non-polarized. The polarity must not be reversed, as doing so will affect the load-breaking service life. ◆ When more than one connection wire is used at the power terminal, ensure that the main power conductor is placed closest to the contactor's main circuit connection point, with the lower-current connection wires placed on top, followed by the washer, spring washer, and nut. Incorrect connection order or loose connections may cause severe overheating and lead to melting of the connected cable's insulation.

◆ The tightening torque of screws and bolts used with the contactor must be controlled within the specified ranges provided below.

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	160 Amps: 70mm²
200 Amps: 95mm²	300 Amps: 185mm²	400 Amps: 240mm²
500 Amps: 300mm²	600 Amps: 400mm²	800 Amps: 500mm²

◆ Prohibit forcibly bending the wire or busbar after installing and tightening the screws, to prevent damage to the contactor and ensure its normal operation!

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