China A9~300 Series AC Contactors 50/60Hz 380V Manufacturers, Factories

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China A9~300 Series AC Contactors 50/60Hz 380V Manufacturers, Factories

The A9~300 Series AC Contactors are engineered for 50/60Hz systems, supporting voltages up to 660V and operational currents up to 300A at 380V under AC-3 category. Ideal for long-distance circuit making and breaking, they pair with thermal overload relays or electronic starters for overload protection. Key features include a direct-action double-break contact structure, arc-resistant plastic housing, durable silver alloy contacts, a compact E-shaped iron core, and flexible coil wiring options for easy installation.

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Product Description

Type & Meaning

1	AC contact
2	Design code
3	The basic specification code corresponds to the rated working voltage under AC-3 utilization category; and is expressed by the numerical value of the rated operating current at 380V under AC-3 application category.
4	The main contact pairs are indicated with two figures; the ones place represents NC (normally closed) contact pairs; The tens digit represents NO (normally open) contact pairs;
5	The auxiliary contact pairs are indicated with two figures; the ones place represents NC (normally closed) contact pairs; For contact pairs, the tens digit represents NO (normally open) contact pairs;

Main Structure and Working Principle

1. Structural Features: The contactor features a positive-mounted, direct-action double-break contact structure. Its cover and body are made of arc-resistant plastic. Models A9–16 use natural arc extinguishing, while models A9–26 to 110 incorporate U-shaped arc extinguishing plates within the body to form a sealed arc chamber, delivering excellent arc extinguishing performance with zero arc-over distance. Contacts are made of anti-welding, wear-resistant silver-based alloy, offering good conductivity, long service life, and environmental friendliness. The iron core adopts an E-shaped design for compact size. Two coil wiring options are available: both terminals at one end, or one terminal at each end, ensuring flexible and convenient wiring.

The base is constructed from glass fiber reinforced plastic, providing high strength and good dielectric properties. Installation can be via screws or DIN rail, enabling quick and easy assembly/disassembly. Live conductive parts are fully enclosed, ensuring high safety performance.

2. Working Principle: When the control power to the contactor’s pull-in coil is applied (or removed), the magnetic system generates (or dissipates) electromagnetic force, driving the moving parts to make (or break) the circuit, thus achieving the control objective.

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Technical Parameters

a. Elevation: The installation site elevation shall not exceed 2000 m;
b. Ambient Temperature: Ambient air temperature shall not exceed +40°C, nor shall it exceed +35°C within 24 hours. The lower limit of ambient air temperature is -5°C;
c. Relative Humidity: The relative air humidity at the installation site shall not exceed 50% at a maximum temperature of +40°C. Higher relative humidity is permitted at lower temperatures, e.g., 90% at 20°C. Measures must be taken to prevent dew condensation on the product due to temperature changes;
d. Pollution Degree: The installation site pollution class is 3;
e. Mounting Angle: The contactor can be mounted vertically or horizontally. If mounted vertically, the gradient between the mounting surface and the vertical plane shall not exceed ±30°; (See Fig. 1)

Table 1: The allowable application category of main circuit and the auxiliary circuit of the contactor

Circuit	Application Category Code	Example of Typical Usage
Main Circuit	AC-1	Noninductive or the micro ineuductive load, resistance furnace
	AC-2	The starting and breaking of wire winding type asynchronous motor
	AC-3	The starting and breaking during operation of cage asynchronous motor
	AC-4	The starting, plug breaking or reverse revolution, spot moving of cage asynchronous motor
Auxiliary Circuit	AC-15	Control AC electromagnet load (>72VA)
Auxiliary Circuit	DC-13	Control DC magnet load

Contactor Rated Parameters: Rated insulation voltage (Ui), rated working voltage (Ue), conventional free air heating current (Ith), rated operating current (Ie) and rated insulation class

Type	Frame Code	Ui (V)	Ith (A)	AC-3 Rated Operating Current Ie (A)			AC-3 Max Control Power of Motor (kW)
Type	Frame Code	Ui (V)	Ith (A)	220V	380V	660V	220V	380V	660V
A9-9	16	1000	26	9	9	7	2.2	4	5.5
A9-12			28	12	12	9	3	5.5	6.5
A9-16			30	17	17	10	4	7.5	9
A9-26	26		45	26	26	17	6.5	11	15
A9-30	40		65	32	32	21	9	15	18.5
A9-40	40		65	37	37	25	11	8.5	22
A9-50	75		100	50	50	35	15	22	30
A9-63			125	65	65	43	18.5	30	37
A9-75			125	75	75	46	22	37	40
A9-95	110		145	96	96	65	25	45	55
A9-110	110		160	110	110	82	30	55	75
A9-145	185		250	145	145	120	40	75	100
A9-185	185		275	185	185	170	50	90	120
A9-210	300		350	210	210	210	60	110	150
A9-260			400	260	260	260	78	140	190
A9-300			450	300	300	280	88	160	220

Outline and Installation Dimension

Type	A	A'	B	C	C′	a	b1	b2	Φ	Mounting Mode
A9-9, 12, 16	44	12.5	74	74	102	35	60	50	4.5	Screw installation or TH75 mounting rail installation
A9-26	54	12.5	90	93.5	120.5	45	80	70	4.2
A9-30, 40	54	12.5	90	108.5	135.2	45	80	70	4.2
A9-50, 63, 75	70	12.5	110	108	135	60	100	90	6.2	Installation or TH35 or TH75 mounting rail installation
A9-95, 110	90	12.5	148.5	123.5	151	78	136	126	6.2	Screw installation or TH75 mounting rail installation
A9-145, 185	Note: Refer to drawing 6 for dimension
A9-210, 260, 300	Note: Refer to drawing 7 for dimension

Frequently Asked Questions (FAQ)

What application categories are compatible with this AC contactor series?

The main circuit supports AC-1 (noninductive/micro-inductive loads like resistance furnaces), AC-2 (slip-ring motor starting/breaking), AC-3 (squirrel-cage motor starting/breaking), and AC-4 (plugging and inching). The auxiliary circuits cover AC-15 and DC-13 control loads.

How is arc extinguishing handled across the different model sizes?

Models A9–16 use natural arc extinguishing, while models A9–26 through A9–110 are equipped with U-shaped arc extinguishing plates forming a sealed arc chamber, ensuring reliable performance with zero arc-over distance.

What are the allowable ambient operating temperature limits?

The contactor operates safely within an ambient temperature range from -5°C to +40°C. The average temperature over any 24-hour period should not exceed +35°C.

What mounting configurations and installation angles are supported?

The units can be mounted using screws or standard DIN rails (such as TH35 or TH75 depending on the frame size). Both vertical and horizontal installations are allowed, provided the vertical tilt does not exceed ±30°.

What contact materials are used to ensure long electrical service life?

The main contacts are made of an anti-welding, wear-resistant silver-based alloy, delivering superior electrical conductivity, enhanced operational longevity, and eco-friendly performance.

China A9~300 Series AC Contactors 50/60Hz 380V Manufacturers, Factories

Product Description

Type & Meaning

Main Structure and Working Principle

Product Display

Technical Parameters

Outline and Installation Dimension

Frequently Asked Questions (FAQ)

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