SZJ300A-D Normally Open DC Contactor

The advantages of using normally open DC contactors are numerous. One of the most notable is their high current carrying capacity, which enables them to control large electrical loads without compromising performance. This feature is particularly important in industrial applications, as equipment often requires large amounts of power to operate efficiently. Additionally, these contactors are designed with fast response times, allowing them to switch circuits quickly and efficiently. This fast operation is critical for dynamic load control, as power demands can fluctuate rapidly.

product details

FEATURES

The applications for normally open DC contactors are very wide and varied. They are often used in motor control systems to manage the operation of DC motors by providing a reliable method of starting and stopping the motors. In addition, these contactors are used in lighting systems, allowing for the control of lights in commercial and industrial settings. They also play an important role in heating equipment, where they are used to regulate the power to the heating elements. Furthermore, with the rise of renewable energy systems such as solar inverters, normally open DC contactors have become an integral part of managing the current generated by solar panels.

SAYOON MODEL IMPLICATION

SZJ	300A	-D	-S	-□	-□	/□
1	2	3	4	5	6	7

1	Product type
2	Rated current
3	Coil type: D-Single coil structure
4	Auxiliary switch: None-Without auxiliary switch; S-With auxiliary switch
5	Mounting bracket type: None-M Horizontal (default); E-Level embedded; X-Oblique; L(N)-Vertical; E1-Level embedded single direction
6	Other function codes
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 2.44)

SAYOON Product Type	SZJ300A-D
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)	300A
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)	25ms
Pull-in time (n/o contacts to close)	12ms
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	1000A/5ms at 48V/DC
Coil power (W)	7-15
Temperature rise of coil (K)	≤60
Temperature rise on outgoing terminal (K)	≤65
Electrical life	20,000 times
Mechanical life	300,000 times
Work specification	Continuous
Contact material	Ag alloy
Load terminal type	M8 Screw
Coil terminal type	M4 Screw
Auxiliary contact rated load (optional)	2A/48VDC, 5A/24VDC
Testing organization certification	CCC,CE,FCC,RoHS

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 M4 tightening torque (N.m)	≯1.2 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	SZJ300A-D
U.N.W.	526g
Package QTY.	50PCS
Mounting bracket type	None - M Horizontal (default), E Level embedded, X Oblique, L (N) Vertical, E1 Level embedded single direction

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 SZJ300A-D/24V 100pcs, indicating the load rated current 300A, without auxiliary contact, default mounting bracket, coil control voltage 24V purchase 100pcs. Special voltage specification products, such as user needs can be special order.