AC Contactor Switch

When simple on-off needs to be endowed with the soul of "automation", SPX Electric customized AC Contactor Switch becomes an inevitable choice. It is far from an ordinary manual switch, but an intelligent power execution terminal that can respond to weak instructions from buttons, sensors, PLCs, or microprocessors and drive hundreds of amperes of current. Its existence makes centralized control, automatic interlocking, and remote scheduling possible.

Why is it a crucial bridge between command and power?

1. Essence: Using "small current" to safely control "large current"
The essence of AC Contactor Switch design lies in the magnetic force generated by the electromagnetic coil (milliampere level control current), which drives the mechanical contacts (capable of carrying hundreds of amperes of power current) to move. This reliable electrical isolation ensures that personnel on the low-voltage control side are completely isolated from precision logic devices, and from the dangers on the high-voltage power side.
Manual switches and circuit breakers have physical limits in terms of current, operating frequency, and safety. The contactor switch is designed for high-frequency, high current, and remote on-off tasks, filling the gap between control logic and powerful loads.

2. Function: A hub from "point control" to "system control"
A small button installed in the control room or an output point of the PLC can control large equipment in a remote workshop through a contactor, achieving centralized and extended control permissions.
Through the flexible wiring of AC Contactor Switch normally open/normally closed auxiliary contacts, classic electrical logic such as self-locking, interlocking, and sequential starting can be easily achieved, forming the hardware foundation of complex safety control circuits.

As an interface feature of system components:
The coil terminals accept standardized control voltages (such as DC24V, AC220V), becoming a universal "language" for seamless integration with various controllers (PLC, relays, timers).
The auxiliary contact provides real-time physical status feedback (on or off) of the switch body, which can be transmitted back to the indicator light, controller or upper monitoring system to form a control loop.

Application

AC Contactor Switch in stock, as the "hand and foot" of PLC, directly controls the start and stop of conveyor motor, hydraulic station motor, mechanical manual power source, etc., and is the direct executor of production rhythm.

In the distribution cabinet, centralized, remote or automatic control of multiple water pumps, fans, compressors and other equipment can be achieved, and overload protectors (thermal relays) can be easily integrated to form motor starters.

Automatically control the power supply of large fresh air units, cooling towers, lighting circuits and other equipment according to time programs or sensor signals, achieving energy conservation and intelligent management.

In the safety circuit, the AC Contactor Switch serves as a critical actuator that immediately cuts off the power supply of the equipment when the emergency stop button is pressed or the safety door is opened, providing the highest level of safety shutdown protection.

Selection key

To select the correct AC Contactor Switch, it is necessary to accurately match its application parameters as the "switch":

Control and power voltage: The coil voltage must be matched with the control power supply; The rated voltage of the main contact must not be lower than the line voltage.

Operating frequency: For frequent start stop operations (such as jog and servo applications), it is necessary to choose a model with a higher rated current or a specially calibrated high operating frequency.

SPX AC Contactor Switch Parameter

Frame(A)			SS-N35
KW/HP(AC-3) Reted power(AC-3) IEC60947-4		220V	11/15
		380V	18.5/25
Reted current(AC-3) GB14048.4		220V	42
		380V	44
Reted heating current(A)			60
Reted insutaled voltage(V)			660
Auxicary contact AC-15	Contact	Standard	2NO+2NC
	Reted current(A)	220V	1.6
		380V	0.95
Electric life			80
Machanical life			500
Outline and installation dimension
			Type	L	W	H	C1	C2	ΦD
			SS-N35	75	89	91	58	54	4.5