Product Description

Three-phase AC motor contactors with overload functions are vital components in the field of industrial automation and electrical control systems. This electrical switching device is specifically designed to manage three-phase motors, ensuring their efficient operation while preventing potential damage. By combining the basic functions of connecting and disconnecting circuits with overload protection mechanisms, this contactor plays a key role in improving the reliability and service life of motor drive equipment.

The main function of a three-phase AC motor contactor with overload function is to control the start, stop and reversing operation of a three-phase motor. This operation is achieved through the action of an electromagnet, which generates a magnetic field when the control circuit is energized. This magnetic field attracts the moving contact, connecting it with the fixed contact, thus completing the closed circuit. This process causes current to flow to the motor, starting the motor to run. However, a unique feature of this contactor is its integrated overload protection, which is usually implemented by a thermal relay or electronic overload protector. This additional layer of safety is essential to prevent potential damage to the motor caused by overheating and excessive current.

The operating principle of a three-phase AC motor contactor with overload function is the same as that of a standard three-phase AC electromagnetic contactor. However, the addition of an overload protection device significantly enhances its functionality. When the motor current exceeds a predetermined threshold, the overload protection mechanism automatically interrupts the circuit, effectively preventing motor overheating and subsequent failure. This proactive approach to motor protection is critical in industrial environments where equipment is subject to varying loads and operating demands.

Three-phase AC motor contactors with overload function are widely used and highly reliable, and are indispensable contactors in various industrial applications such as mechanical equipment and power systems. They can monitor the operating status of the motor and ensure that the equipment operates within a safe parameter range, thereby minimizing the risk of unexpected failures. In addition, these contactors are simple in structure and easy to operate, which facilitates quick installation and maintenance, making them the first choice of field engineers and technicians.

SPX AC Contactor Switch Parameter

Frame(A)			SS-N50
KW/HP(AC-3) Reted power(AC-3) IEC60947-4		220V	15/20
		380V	22/30
Reted current(AC-3) GB14048.4		220V	54
		380V	51
Reted heating current(A)			80
Reted insutaled voltage(V)			660
Auxicary contact AC-15	Contact	Standard	2NO+2NC
	Reted current(A)	220V	1.6
		380V	0.95
Electric life			60
Machanical life			300
Outline and installation dimension
			Type	L	W	H	C1	C2	ΦD
			SS-N50	88	106	106	75	70	5