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Product Detail

QNZ1-300C Zero-Power Magnetic Latching DC Contactor (Aux. Contacts Opt.)

Rated Load Voltage (VDC): 160 Rated Load Current (A): 300 Rated Insulation Voltage (VDC): 1500 Coil Control Voltage (V): DC12/24/48/60 Coil Operating Power Consumption (W): 0 Protection Rating: IP67 Electrical Life (Operations): 1 × 10⁴ Mechanical Life (Operations): 20 × 10⁴ Mounting Method: Bent Bracket / Straight Bracket Auxiliary Contacts: Optional (11/20/02)

DETAILS

1.Application

The QNZ1-C series zero-power consumption magnetic latching DC contactors are suitable for circuits with an operating voltage of 200V or below under DC-1 load. They can also be used as bypass isolation switches in frequency converters, soft starters, high-frequency heating power supplies, or other similar DC-20 loads.

Products comply with standards: IEC/EN 60947-4-1, GB/T 14048.4. Products have obtained certification: RoHS.

2.Coding

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	"C" denotes magnetic latching energy-saving coil
6	Default is blank, indicating one normally open main contact; "B" indicates one normally closed main contact
7	Default is blank; optional accessories include two sets of auxiliary contacts: F11 (one NO & one NC), F20 (two NO), F02 (two NC)
8	Coil Voltage Us

3.Key Points

▲ Zero-power consumption bistable magnetic latching energy-saving coil; the coil itself does not generate heat. ▲ Excellent resistance to shock and vibration; high contact pressure with silver alloy contacts ensures reliable contact, low temperature rise, and strong overload performance. ▲ Rare-earth strong magnetic arc extinguishing, long electrical lifespan, high resistance to welding, safe and reliable. ▲ High insulation performance, withstands 3500V power frequency voltage. ▲ Compliant with EU RoHS environmental directives and national energy-saving and environmental protection requirements. ▲ Two options for coil connection: fixed screw terminal or flexible lead wire. *(Note: 600-800C models have lead wire only.)

4. Operating and Installation Conditions

▲ Ambient Temperature: -40°C to +85°C. ▲ Ambient Humidity: Maximum relative humidity 85%. ▲ Altitude Derating: For installation altitudes above 2000 meters, derate by 5% for every 1000 meters of increased altitude, up to a maximum of 5000 meters. ▲ Sinusoidal Sweep Vibration at Fixed Point: 10–500Hz (10Hz–50Hz: amplitude 2.5mm; 50Hz–200Hz: amplitude 0.16mm; 200Hz–500Hz: acceleration 50 m/s²). ▲ Shock Acceleration: 300 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 series complies with standards: IEC/EN 60947-4-1, GB/T 14048.4.

Specifications Parameters		QNZ1-300C
Contact Configuration		1P (NO or NC); 1P (NO or NC) + F11、F20、F02
Rated Insulation Voltage Ui(V)		1500
Bypass Operating Voltage Un (VDC)		1500
Rated Operational Voltage Ue (VDC)		160
Rated Operational Current Ie (A) DC-1		300
Contact Voltage Drop Ud (mV)		≤95
Pole Impedance Z (mΩ)		≤0.4
Minimum Load for Make		24V 200mA
Auxiliary Contact Parameters		Ith：10A； DC-12：Ue/Ie：24V/10A； DC-12：Ue/Ie：48V/4A； DC-12：Ue/Ie：220V/1A。
Control Coil	Coil Voltage Us (VDC)	12、24、48、60
	Close Voltage (VDC)	0.85Us～1.10Us (Terminal A1 or red wire connects to positive, A2 or black wire to negative)
	Open Voltage (VDC)	0.85Us～1.10Us (Terminal A1 or red wire connects to positive, A2 or black wire to negative)
	Operating Current (A)	2～0.4 (Coil energization time 50ms～120ms)
	Holding Current (A)	0 (Long-term energization is not allowed)
	Operating Power (W)	≤24 (Coil energization time 50ms～120ms)
	Holding Power (W)	0 (Long-term energization is not allowed)
Electrical Life	DC-1, Ue, Ie (x10⁴ operations)	1
Operating Frequency (operations/hour)		360 (1 operation/10 seconds, energization time not exceeding 1 second)
Mechanical Life (x10⁴ operations)		20
Overload Performance (A)		1.5Ie/30min; 3Ie/1min; 5Ie/10s; 8Ie/1s; other data refer to Overload Curve
Operating Times	Close Time (ms)	20～40
Operating Times	Open Time (ms)	10～30
Main Contact Wire/Busbar Cross-section (mm²)		185
Main Contact Terminal Tightening Torque (N.m)		M8 Bolt: 6.0～9.0
Insulation Resistance (MΩ)		≥300 (at 1500VDC)
Dielectric Strength	Between coil and contacts	3500V AC, 1 Min, No breakdown or flashover, leakage current ≤5mA
Dielectric Strength	Between open contacts	3500V AC, 1 Min, No breakdown or flashover, leakage current ≤5mA
Temperature Rise	Coil (at Us)	≤15K
	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. 0.45

QNZ1-C Overload Current vs. Time Curves:

6. Outline and Installation Dimensions (Dimensions are the same for NO and NC models)

300C 300C 300C+F 300C+F 300C

Bent Bracket, Bent Bracket, Bent Bracket, Bent Bracket, No Bracket,

Screw Terminals Lead Wire Screw Terminals Lead Wire Screw Terminals

300C 300C+F 300C+F 300C 300C

No Bracket, No Bracket, No Bracket, Straight Bracket, Straight Bracket,

Lead Wire Screw Terminals Lead Wire Screw Terminals Lead Wire

300C+F 300C+F

Straight Bracket, Straight Bracket,

Screw Terminals Lead Wire

QNZ1-300C (Bent Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C (Bent Bracket, Lead Wire) Outline and Installation Dimensions

QNZ1-300C (No Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C (No Bracket, Lead Wire) Outline and Installation Dimensions

QNZ1-300C (Straight Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C (Straight Bracket, Lead Wire) Outline and Installation Dimensions

QNZ1-300C+F (Bent Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C+F (Bent Bracket, Lead Wire) Outline and Installation Dimensions

QNZ1-300C+F (No Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C+F (No Bracket, Lead Wire) Outline and Installation Dimensions

QNZ1-300C+F (Straight Bracket, Screw Terminals) Outline and Installation Dimensions

QNZ1-300C+F (Straight Bracket, Lead Wire) Outline and Installation Dimensions

7. Connection Diagrams (Polarity must not be reversed)

QNZ1-C QNZ1-C+F11

QNZ1-C+F20 QNZ1-C+F02

QNZ1-CB QNZ1-CB+F11

QNZ1-CB+F20 QNZ1-CB+F02

Symbol Description:

U: Coil supply voltage;

Us: Coil voltage;

I: Coil current;

R: Coil resistance;

T: Time;

Time Nodes:

t1: Positive pulse begins;

t2: Positive pulse ends;

t3: Reverse pulse begins;

t4: Reverse pulse ends;

t5: Contact begins closing;

t6: Contact begins opening;

t4 marks end of contactor operation;

Schematic Diagram of Bistable Magnetic Latching Contactor Operating Principle

8. Ordering Information

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

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	"C" denotes magnetic latching energy-saving coil
6	Default is blank, indicating one normally open main contact; "B" indicates one normally closed main contact
7	Default is blank; optional accessories include two sets of auxiliary contacts: F11 (one NO & one NC), F20 (two NO), F02 (two NC)
8	Coil Voltage Us

Examples:

QNZ1-200C DC24V Bent Bracket, Screw Terminals 100 units; 100 units magnetic latching DC contactor, magnetic latching coil, one normally open main contact, 200A current, bent bracket mounting, screw terminals, coil voltage DC24V. QNZ1-200CB DC48V No Bracket, Lead Wire 500mm 100 units; 100 units magnetic latching DC contactor, magnetic latching coil, one normally closed main contact, 200A current, no bracket mounting, 500mm lead wire, coil voltage DC48V.

9. Precautions for Use

◆ The product coil is polarized (A1 is positive, A2 is negative). 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. ◆ The bistable magnetic latching energy-saving coil has a relatively large inrush current at initial opening/closing operation, lasting between 50-120ms depending on product characteristics. Therefore, the driving power of the contactor must be greater than the product 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 coil, rendering the contactor inoperative. ◆ Magnetic latching DC contactors use a square wave pulse power supply mode. The magnetic latching coil must not be energized for extended periods. For CLOSE: connect coil terminal A1 (or red wire) to positive and A2 (or black wire) to negative. For OPEN: connect coil terminal A1 (or red wire) to negative and A2 (or black wire) to positive. ◆ 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 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	160 Amps: 70mm²
200 Amps: 95mm²	300 Amps: 185mm²	400 Amps: 240mm²
500 Amps: 300mm²	600 Amps: 400mm²	800 Amps: 500mm²
1000 Amps: 600mm²	1200 Amps: 800mm²

◆ 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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