Modular Contactor


Modular Contactor

If you are looking for a modular contactor with an amperage between 25A and 100A,with 230 Vac, either two or four poles this is definitely its section. In ONCCY, we put at your fingertips a wide variety of electromagnetic contactors suitable for domestic or industrial applications.

The function of manually or automatically controlling the various circuits of an enclosure, home or building, among others, is of great importance and therefore it is recommended to use quality contactors that have undergone rigorous quality controls, in order to protect their safety and that of their circuit. Here you will find the modular contactor you need with the confidence to acquire quality at an exceptional price.

To select the suitable modular contactor it is necessary to know the required operating load and currents. It is also important to note whether direct current or alternating current applies.

ONCCY offers modular contactors with a coil voltage of either 24 V or 230 V (AC). AC/DC coil models (hum-free) are available on request.

  • High degree of Electrical life
    The EMC1 modular contactor has been tested to withstand 100,000 times full load switch ON or OFF under.
    AC-a load Utilization category.
  • Noiseless and hum free
    The EMC1 contactor eliminates the obvious impact sound of the traditional contactor at the moment of pull-in and eliminates contactor in the low-frequency hum noise of operating.
    Applicable to most electric areas of commercial building . In particular, the modular contactor AC / DC series achieves free noise and creates a quiet environment for you.
  • Energy Saving
    The EMC1 contactor has an optimized electromagnetic system, which greatly reduces the holding power of contactor.
  • Compact design
    The width of EMC1 contactors is much smaller than traditional AC Contactors, which saves users more installation space and can be conveniently installed in ordinary distribution boxes.
  • Auxiliary function
    The EMC1 contactor can be extended with auxiliary contacts on the right side of the product, which is more suitable for signal feedback requirements in an intelligent control environment.


Light circuits
Ohmic loads
Small three-phase AC drives

Modular Contactor

Features and Benefits

Modular contactor has the following benefits to the users.

  • Higher Current
    18mm 1MUwidth,maximumcurrentupto63A
  • Greater Wiring Capacity
    M5 wiring screw,maximum wiring capacity25mm
  • More Secure
    Hidden coilterminals forlargerand saferelectricalclearances
  • Two Types Of Contacts
    Normally open and normally closed two kinds of contacts are optional
Modular Contactor
Modular Contactor

Applications and Markets

Modular contactors are used in a wide variety of applications. They are primarily found in different building facilities, including lighting systems, heat pumps, air-conditioning or ventilation systems. Their various features make them an ideal solution for commercial and industrial environments.

The most common applications of the modular contactor are:

  • Lighting (The main application of modular contactors)
  • E-mobility (incl. in AC circuits)
  • AC circuit distribution.
  • Small motors and pumps.
  • DC circuit distribution.
  • DC motors.
  • Back-up power switching.

FAQ you want to know

What is a contactor?

A contactor is an automated electrical control device. Primarily, contactors are used to frequently make or break AC and DC circuits. They are characterized by their high control capacity and can be operated from a distance. When used in conjunction with relays, contactors can facilitate timed operations, interlock control, and various quantitative controls, making them widely applied in automatic control circuits. The main control targets of contactors are electric motors, but they can also be used to control other electrical loads such as electric heaters, lighting, welding machines, and capacitor banks.

How to choose the contactor correctly?

To correctly select a contactor, one should follow these guidelines:

  1. Choose the type of contactor based on the nature of the load. The contactor type must be compatible with the load.
  2. The voltage rating of an AC contactor should match the load, with the rated voltage being greater than or equal to the working voltage of the main circuit. Additionally, the contactor’s rated operational voltage should not exceed its rated insulation voltage.
  3. The rated current should be greater than or equal to the rated current of the circuit being controlled. The making current of the contactor should exceed the load’s starting current, and the breaking current should be higher than the current needed to interrupt the load during operation. When calculating the load current, consider the actual working environment and specifics. For motor loads, adjust accordingly based on their operating mode.
  4. The rated voltage and frequency of the coil should match those of the control circuit where it is being used. Account for the length of the wiring in the contactor’s control circuit. Generally, contactors are recommended to operate within 85-110% of their rated voltage. If the wiring is too long and the voltage drop is significant, the contactor coil may not respond to the closing command; excessive line capacitance might also inhibit the tripping command.
  5. The number and current capacity of the contactor’s auxiliary contacts should meet the wiring requirements of the control circuit.
  6. If the operating frequency of the contactor exceeds the specified value, the rated current should be doubled.
  7. Short-circuit protection device parameters should be selected in coordination with the contactor. Reference catalog manuals, which typically include compatibility tables for contactors and fuses, for selection.
  8. The coordination between contactors and circuit breakers should be determined based on the overload factor and short-circuit protection current coefficient of the circuit breaker. The conventional heating current of the contactor should be less than the overload current of the circuit breaker, and the making and breaking currents of the contactor should be less than the short-circuit protection current of the circuit breaker for it to provide protection. Practically, the ratio of the conventional heating current to the rated operational current of a contactor under a voltage level is between 1 and 1.38, while the inverse-time overload factor parameters for circuit breakers vary among different types, making standard coordination challenging without specific calculations.
  9. The installation distance between the contactor and other components must comply with relevant national standards and specifications, considering maintenance and wiring distances.

What are the rated voltages of contactors?

The rated voltage of a contactor refers to the rated voltage of its main contacts, commonly available in the following voltage levels:

For DC contactors: 110V, 220V, 440V, 660V, etc.; For AC contactors: 127V, 220V, 380V, 500V, etc.; For instance, a three-phase induction motor with a load of 380V would require a 380V AC contactor. The rated voltage of a contactor indicates a set of related rated values under technical parameters such as the contactor’s making and breaking capabilities, rated duty, and utilization category. This includes the Rated Operational Voltage (Ue), Rated Insulation Voltage (Ui), Rated Impulse Withstand Voltage (Uimp), and Rated Control Supply Voltage (Us), among others.

What is the rated operating current of the main contact?

The rated operational current of the main contacts is determined by factors such as rated operational voltage, rated power, rated duty, utilization category, and enclosure protection type, ensuring the normal operation of the contactor’s main contacts. The rated current, as indicated on the contactor’s nameplate, refers to the rated current of the main contacts. Commonly used current ratings are:

For DC contactors: 06A, 09A, 25A, 40A, 60A, 100A, 250A, 400A, 600A, etc.; For AC contactors: 09A, 12A, 18A, 25A, 32A, 38A, 40A, 50A, 65A, 95A, etc. The above currents refer to values when the contactor is mounted on an open-type control panel, and the contacts operate without exceeding the rated breaking capacity, under a duty of intermittent long-term operation. “Intermittent long-term operation” means the contactor is energized continuously for no more than 8 hours. If exceeded, the contactor must be opened and closed without load at least three times to remove any oxide film on the contact surfaces. If the aforementioned conditions change, the current values must be adjusted accordingly.

When a contactor is installed inside an enclosure, the current must be reduced by 10% to 20% due to poorer cooling conditions. For long-term duty operations where the duty cycle does not exceed 40%, and when mounted openly, the current can be increased by 10% to 25%; if installed in an enclosure, an increase of 5% to 10% is permissible. For situations between the above conditions, adjustments can be made as deemed appropriate.

How is the rated operating frequency of a contactor defined?

The rated operating frequency of a contactor refers to the number of times it can be energized per hour. For AC contactors, the maximum is 600 operations per hour, while DC contactors can reach up to 1200 operations per hour. Based on this, the selection of a contactor can be carried out in the following steps:

  1. Determine the duty category based on the nature of the load.
  2. Select the contactor series according to the category, as detailed in China’s electrical engineering professional standards (D25-29 and D210-61).
  3. Determine the rated voltage of the contactor based on the load’s rated voltage.
  4. Establish the rated current of the contactor based on the load current and adjust it according to actual external conditions.
  5. Choose the rated voltage of the coil.
  6. Review the operating frequency based on the load conditions; it should be within the rated range.


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