CZW352A Normally Open DC Contactor

A notable feature of normally open DC contactors is their high current carrying capacity. Designed to handle large loads, these contactors are used in a variety of industrial and commercial environments. Whether in manufacturing plants, renewable energy systems, or automation equipment, their ability to withstand high currents ensures reliable operation in demanding conditions. This durability is critical to maintaining operational efficiency and reducing downtime.

product details

SAYOON MODEL IMPLICATION

The high current carrying capacity of normally open DC contactors makes them an ideal choice for many critical applications. In modern industry, the reliability and stability of equipment directly affect production efficiency. Therefore, contactors that can withstand high currents play an important role in motor control, heavy machinery, and power distribution systems. In addition, with the advancement of Industry 4.0 and smart manufacturing, the demand for high-performance control equipment is increasing, and the application prospects of normally open DC contactors are becoming broader.

SAYOON MODEL IMPLICATION

CZW	352A	-S	-K	-2L	-□	/24V
1	2	3	4	5	6	7

1	Product type
2	Rated current: 350A
3	Auxiliary switch: None-Without auxiliary switch; S-With auxiliary switch
4	Magetic holding structure: K-Two joint magnetic retention (Single coil, Two joint self-locking); 2K-Three joint magnetic retention (Double coil, Three joint self-locking)
5	Mounting bracket type: 2L-Two vertical (default); M-Horizontal; X-Oblique; 1LW-One vertical horizontal; 2N-Rear
6	Other function codes: l-With suppressor diode; R-With pre-charged resistance; CO-Continuous; IN-Intermittent
7	Coil rated voltage: 12V, 24V, 36V, 48V, 60V, 72V etc.

Uses

This product have one normally open contact, for electric vehicles, telecommunication equipment, engineering machinery, car batteries, electric forklift trucks, trains, ships, electronic control systems such as uninterruptible power supply.

Technical Parameters: (Version 1.06)

SAYOON Product Type	CZW352A
Contact form	1 NO
Coil Rated voltage (DC V)	6V,12V,24V,36V,48V,60V,72V,84V,120V,150V,220V etc.
Contact voltage (DC V)	≤60V
Rated load current of contact 48V circuit (DC-1)	350A
Typical voltage drop across contacts per 100A	≯80mV
The cooling pull-in voltage at (20±5)℃ (V)	≯70%
The cooling drop-out voltage at (20±5)℃ (V)	≯35%,≮5%
Working voltage range of 40℃ coil	0.8-1.2Us
Drop-out time (n/o contacts to open)	50ms
Pull-in time (n/o contacts to close)	15ms
Maximum bounce time for contact connection	10ms
Maximum bounce time for contact disconnection	3ms
Insulation resistance	20MΩ
Electric strength to resist	50Hz/60Hz 1000VAC 1minute
Typical fault currents which can be ruptured	1200A/5ms at 48V DC
Coil power (W)	20-35
Temperature rise of coil (K)	≤80
Temperature rise on outgoing terminal (K)	≤65
Electrical life	10,000 times
Mechanical life	300,000 times
Work specification	Continuous or Intermittent(default)
Contact material	Ag alloy
Load terminal type	2-M8 Screw
Coil terminal type	6.3mm spade terminals
Auxiliary contact rated load (optional)	2A/48VDC, 5A/24VDC

Note:As regarding to the different using environments of customers which requires different focus of the functions,and in order to improve the comprehensive properties of our products,sayoon may adjust the coil parameters,temperature rise and so on. The above parameters are for reference only, For details, please refer to the guidelines for selection and use of the SAYOON DC contactor.

Load Characteristic Curve

Installation Diagram

Wiring Diagram

Temperature Curve

Mechanical Ability And Use Of The Environment

Contact lead M8 tightening torque (N.m)	≯9.0 appropriate
Coil lead-out torque (N.m)	≯0.8 appropriate
Ambient temperature	-25~+70℃
Relative humidity	+20℃ 98%
Vibration freq. atthe fixed position	3G, 1～50Hz amplitude 0.5mm
Concussion	(60～100) time/minute、acceleration≤4g
Altitude	2000m
Installation direction	Random
International protection	IP40 (According IEC60947)

Order Instruction

SAYOON Product Type	CZW352A
Mounting bracket type	2L Two vertical(default), M Horizontal , 1L One vertical,

When ordering, please state the following: name, full model, control coil voltage specification, installation frame type, whether with auxiliary contact, order quantity. For example: DC Contactor CZW352A/24V 100pcs, indicating the load rated current 350A, without auxiliary contact, default mounting bracket, coil control voltage 24V purchase 100pcs. Special voltage specification products, such as user needs can be special order.