Rated Load Voltage (VAC): 690 Rated Load Current (A): 630 Rated Insulation Voltage (V): 1500 Coil Control Voltage (V):48, 110, 220, AC380V 50/60Hz AC/DC220～380V (Wide voltage 132～540V) AC/DC48～127V (Wide voltage 28～190V) Coil Operating Power Consumption (W): ≤2

Electrical Life (Operations): 150 × 10⁴ Mechanical Life (Operations): 150 × 10⁴ Contact Configuration: NO or NC (B indicates Normally Closed) Auxiliary Contacts: 4NO+4NC

Product Description

1. Application

The QNC-WH Series Arc-less AC contactors are suitable for circuits with a working voltage up to 1500V at AC-3 utilization category under 50Hz (or 60Hz) AC. They are used for remote connection and disconnection of circuits and frequent starting control of AC motors. Products comply with standards: IEC/EN 60947-4-1, GB/T 14048.4. Products certified: RoHS.

2.Coding

Figures	Coding
1	Company code: QN represents Nanjing Quanning Electric Co., Ltd.
2	C: AC Contactor
3	Basic specification code, the rated current Ie
4	Default: None indicates normally open main contacts; B indicates normally closed main contacts
5	03 indicates three-pole contactor (default, not marked); 04 indicates four-pole contactor; 08 indicates two-open-two-close contactor
6	33 indicates three-NO-three-NC auxiliary contacts; 44 indicates four-NO-four-NC auxiliary contacts;
7	Coil voltage Us
8	WH indicates arc-less make/break of main contacts
9	C indicates marine product

3. Key Points

▲ Arc-less make/break technology for main contacts, long electrical life, strong anti-welding performance, safe and reliable. ▲ Micro-power consumption DC coil technology, featuring high efficiency, energy savings, and surge protection; coil itself does not generate heat. ▲ Strong resistance to shock and vibration, high contact pressure, silver alloy contacts, reliable contact, low contact temperature rise, strong overload capability. ▲ Coil adopts AC/DC integrated design scheme, avoiding AC/DC conversion, saving customer usage costs. ▲ High insulation performance, power frequency withstand voltage 3500V. ▲ Complies with EU RoHS environmental directive, meets national energy-saving and environmental protection requirements.

4. Operating and Installation Conditions

▲ Ambient temperature: -40°C to +85°C. ▲ Ambient humidity: Maximum relative humidity 85%. ▲ When installation altitude exceeds 2000 meters, derate by 5% per 1000 meters increase, maximum not exceeding 5000 meters. ▲ Sinusoidal sweep vibration frequency at mounting point: 10~500Hz (frequency 10Hz~50Hz, amplitude 2.5mm; 50Hz~200Hz, amplitude 0.16mm; 200Hz~500Hz, acceleration 50m/s²). ▲ Shock acceleration: 300m/s². ▲ Pollution degree: Pollution degree 3. ▲ Mounting 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.

Specifications Parameters		QNC-630WH
Contact Configuration		4P (NO or NC) + 44 (4NO+4NC);
Rated Insulation Voltage Ui (V)		1500
Rated Operating Voltage Ue (VAC)		690
Rated Operating Current Ie (A) AC-3		630
Contact Voltage Drop Ud (mV)		≤95
Pole Impedance Z (mΩ)		≤0.4
Minimum Connectable Load		24V 200mA
Auxiliary Contact Parameters		Ith: 10A; AC-15: Ue/Ie: 380V/0.95A; DC-13: Ue/Ie: 220V/0.15A.
Control Coil	Coil Voltage Us (VDC/VAC)	24V, 24, 48, 110, 220, AC380V 50/60Hz; AC/DC220～380V (Wide voltage 132～540V); AC/DC48～127V (Wide voltage 28～190V)
	Pick-up Voltage (VDC/VAC)	0.85Us～1.10Us
	Drop-out Voltage (VDC/VAC)	0.10Us～0.75Us
	Pick-up Current (A)	3～6.7, see attached table for details
	Hold-in Current (A)	0.0052～0.0832, see attached table for details
	Pick-up Power (W)	120～1520, see attached table for details
	Hold-in Power (W)	≤2, see attached table for details
Electrical Life	AC-3, Ue, Ie (10,000 operations)	150
Operating Frequency (operations/h)		300 (1 operation/12 seconds, minimum interval between power-on and power-off not less than 0.5s)
Mechanical Life (10,000 operations)		150
Overload Performance (A)		1.5Ie/30min; 3Ie/1min; 5Ie/10s; 8Ie/1s; other data refer to overload characteristic curves.
Operating Times	Pick-up Time (ms)	≤300
	Drop-out Time (ms)	≤50
Main Contact Wire/Busbar Cross-sectional Area (mm²)		400
Main Contact Terminal Tightening Torque (N.m)		M10 Bolt: 10.0～15.0
Insulation Resistance (MΩ)		≥300 (500VDC)
Dielectric Strength	Between Coil and Contact	Power frequency AC3500V/1Min, no breakdown or flashover, and leakage current ≤5mA.
	Between Open Contacts	Power frequency AC3500V/1Min, no breakdown or flashover, and leakage current ≤5mA.
Temperature Rise	Coil (at Us)	≤15K
	Terminals (at Ie)	≤65K
	Enclosure	＜60K
Enameled Wire	Temperature Resistance	≤180℃
	Insulation Class	Class H
	Withstand Voltage (Enamel to Ground)	1000V/1Min, no breakdown or flashover, and leakage current ≤5mA.
Weight (kg)		Four-pole contactor approx. 3.6.

Attached Tables:

Four-pole Contactor Coil Parameters:

Coil Voltage (VAC/VDC)	RC Absorption Pulse Current (A)	Pick-up Current (A)	Hold-in Current (A)	Pick-up Power (W)	Hold-in Power (W)
24	≤10	≤6.7	≤0.0832	≤160	≤2
48	≤10	≤6.7	≤0.0416	≤320	≤2
110	≤6	≤6	≤0.0180	≤660	≤2
220	≤4	≤4	≤0.0088	≤880	≤2
AC380V	≤4	≤4	≤0.0052	≤1520	≤2

QNC-WH Overload Current vs. Time Curves:

6. Outline and Installation Dimensions (Dimensions are the same for Normally Open and Normally Closed Models)

QNC-630 0444 WH Outline and Installation Dimensions

7. Wiring Diagrams

QNC-0444 WH

QNC-B0444 WH

8. Ordering Information

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

Figures	Coding
1	Company code: QN represents Nanjing Quanning Electric Co., Ltd.
2	C: AC Contactor
3	Basic specification code, the rated current Ie
4	Default: None indicates normally open main contacts; B indicates normally closed main contacts
5	03 indicates three-pole contactor (default, not marked); 04 indicates four-pole contactor; 08 indicates two-open-two-close contactor
6	33 indicates three-NO-three-NC auxiliary contacts; 44 indicates four-NO-four-NC auxiliary contacts;
7	Coil voltage Us
8	WH indicates arc-less make/break of main contacts
9	C indicates marine product

Examples:QNC-50033 AC220V WH 100 units; 100 units of three-pole arc-less AC contactors, three normally open main contacts, 500A current, auxiliary contacts three-NO-three-NC, coil voltage AC220V. QNC-10000444 AC220V WH 100 units; 100 units of four-pole arc-less AC contactors, four normally open main contacts, 1000A current, auxiliary contacts four-NO-four-NC, coil voltage AC220V.

9. Precautions for Use

◆ If the product coil input is DC voltage, then the coil has polarity (A1 is positive, A2 is negative). ◆ The energy-saving coil has a relatively large starting current at initial operation, lasting between 100~120ms depending on the product's own characteristics. Therefore, the driving power for the contactor must be greater than the coil power of the product, and the operating frequency must not exceed the rated value. Otherwise, it may affect the normal startup of the contactor, or even burn out the energy-saving module, causing the contactor to fail. ◆ 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 contactor coil, the PWM output voltage must be adjusted to 100%; otherwise, it may affect the reliable operation of our contactors. A step-type power supply mode is recommended. ◆ When using more than one connection wire at the power terminal, ensure the main power wire is closest to the main circuit connection point of the contactor, with the smaller current connection wire on top, followed by the washer, spring washer, and nut. Incorrect connection order or poor connection may cause severe overheating and melt the insulation of the connecting cable.

◆ Contactor Communication Function Introduction:

The QNC-WH arc-less contactor is an electrical control device integrating remote control, status monitoring, and intelligent linkage. It supports interaction with IoT platforms, local servers, or mobile terminals via wired or wireless communication protocols to achieve intelligent management of electrical loads. Wired Protocol: RS-485 (Modbus RTU). Remote Control: Delay and make/break functions can be controlled by sending commands via MQTT/HTTP API. Status Reporting: Real-time upload of parameters (voltage, current, temperature, switch status) to the cloud, default interval 5 seconds (customizable). Parameter Setting: Real-time setting of overcurrent, overvoltage, delay, working mode, etc. (customizable).

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

M3 Screw: 0.5～0.8N.m	M3.5 Screw: 0.8～1.2N.m	M4 Screw: 1.2～1.8N.m
M5 Screw: 2.0～3.0N.m	M6 Bolt: 3.0～4.5N.m	M8 Bolt: 6.0～9.0N.m
M10 Bolt: 10.0～15.0N.m	M12 Bolt: 14.0～21.0N.m

◆ Main contact wire or busbar cross-sectional area (see table).

150A: 50mm²	265A: 150mm²	330A: 185mm²
400A: 240mm²	500A: 300mm²	630A: 400mm²
800A: 500mm²	1000A: 600mm²	1250A: 800mm²
1650A: 1500mm²	2000A: 1500mm²	3500A: 3500mm²
5050A: 5050mm²