EARU 2P AC Household Modular Contactor Switch Controller

1. Introduction

The EARU EACT series household AC contactor is designed for controlling electrical circuits in residential and commercial applications. It is suitable for AC 50Hz or 60Hz circuits with a rated operating voltage of 230V. These contactors are primarily used for remotely connecting or disconnecting circuits, making them ideal for various automation tasks in smart homes, hotels, and other settings. They are available in various current ratings from 16A to 63A and different contact configurations (2NO, 2NC, 1NO1NC).

2. Safety Information

WARNING: Installation and maintenance should only be performed by qualified electricians to prevent electric shock or injury.

Normal Working and Installation Conditions:

• Ambient Temperature: -5°C to +40°C. The average temperature should not exceed +35°C within a 24-hour period.
• Altitude: Not exceeding 2000m above sea level.
• Atmospheric Conditions: Relative humidity at the installation site should not exceed 50% when the maximum temperature is +40°C. Higher relative humidity is permissible at lower temperatures. The monthly average minimum temperature in the wettest month should not exceed +25°C, and the monthly average maximum relative humidity for that month should not exceed 90%. Consider dew formation due to temperature changes.
• Pollution Class: Class 2.
• Installation Condition: Class II.

Cautions:

• Ensure the correct mode of connection is followed according to the wiring diagrams.
• Tighten all binding screws securely during connection to prevent loose contacts and potential hazards.

3. Product Overview

The EARU EACT series contactors are modular devices designed for DIN rail mounting. They feature a compact design and clear labeling for easy installation and identification.

Key Components:

1. Main Contact Access (1, 3): Terminals for connecting the main power circuit.
2. Coil Contact (A1, A2): Terminals for connecting the control voltage to energize the coil.
3. Model Number (e.g., EACT-25): Indicates the specific model and current rating.
4. Indication Window: Provides visual status of the contactor (e.g., engaged/disengaged).
5. Rated Current (Ie): The maximum continuous current the main contacts can carry.
6. Voltage Rating (Ue): The rated operating voltage of the main contacts.
7. Insulation Voltage (Ui): The maximum voltage the insulation can withstand.
8. Approval Standard (EN61095, IEC61095): International standards the product complies with.
9. Household Electrical Loads: Output terminals for connecting the controlled load.
10. Main Contact Output (2, 4): Output terminals for the main power circuit.

Product Dimensions:

4. Installation

DIN Rail Mounting:

The contactor is designed for easy mounting on a standard 35mm DIN rail. To install:

1. Pull down the motion stopping component (yellow clip) at the bottom of the contactor.
2. Position the contactor onto the DIN rail.
3. Push up the motion stopping component to secure the contactor firmly on the rail.

To remove the contactor, pull down the motion stopping component and lift the contactor off the rail.

Wiring Instructions:

Ensure all connections are made with appropriate wire gauges and are securely tightened. Refer to the specific wiring schematic for your contactor type (2NO, 2NC, or 1NO1NC).

2NO Wiring Schematic (Normally Open):

In a 2NO configuration, both main contacts are normally open. When the coil (A1, A2) is energized, both contacts close, and the load is energized.

1NO1NC Wiring Schematic (One Normally Open, One Normally Closed):

In a 1NO1NC configuration, one main contact is normally open, and the other is normally closed. When the coil (A1, A2) is energized, the NO contact closes (energizing Load 1) and the NC contact opens (de-energizing Load 2).

Connection Details:

Refer to the table above for recommended tightening torque and compatible cable sizes for rigid and flexible copper cables.

Product Demonstration Video:

5. Operation

The EARU modular contactor operates by energizing its coil (A1, A2 terminals) with the specified control voltage (110V or 220V AC). When the coil is energized, the main contacts change state:

• Normally Open (NO) contacts: Close, allowing current to flow to the connected load.
• Normally Closed (NC) contacts: Open, interrupting current to the connected load.

The indication window on the front of the contactor provides a visual cue of its current state (engaged or disengaged).

6. Maintenance

To ensure optimal performance and longevity of your EARU contactor:

• Regularly inspect the terminals for secure connections. Loose connections can lead to overheating and malfunction.
• Keep the contactor clean and free from dust and debris. Use a dry cloth for cleaning.
• Avoid exposing the contactor to excessive moisture or corrosive environments.
• The electrical endurance is rated for 100,000 cycles, indicating a long operational life under normal conditions.

7. Troubleshooting

Contactor Not Engaging/Disengaging:

• Check Control Voltage: Verify that the correct control voltage (110V or 220V AC) is being supplied to the A1 and A2 coil terminals. Incorrect voltage can prevent the coil from energizing properly.
• Check Wiring: Ensure all wiring connections are secure and correctly follow the schematic for your contactor type (2NO, 2NC, 1NO1NC).
• Coil Continuity: If the coil is not energizing, check its continuity with a multimeter. A broken coil will prevent operation.
• Mechanical Obstruction: Ensure there are no physical obstructions preventing the contacts from moving freely.

Overheating:

• Loose Connections: Re-tighten all terminal screws.
• Overload: Ensure the connected load does not exceed the contactor's rated current (e.g., 16A, 20A, 25A, 32A, 40A, 63A).
• Improper Ventilation: Ensure adequate airflow around the contactor, especially if multiple devices are installed in an enclosure.

8. Specifications

9. User Tips

• Coil Voltage Compatibility: Always ensure the control voltage supplied to the A1 and A2 terminals matches the rated coil voltage of your specific contactor model (e.g., 110V or 220V). Using an incorrect voltage can damage the coil or prevent proper operation.
• Contact Type Selection: Carefully choose the contactor type (2NO, 2NC, or 1NO1NC) based on your application's requirements. 'NO' means Normally Open, 'NC' means Normally Closed. '2NC' means two Normally Closed contacts.
• Space for Heat Dissipation: When installing multiple contactors or other electrical components in an enclosure, ensure sufficient space for heat dissipation. The manufacturer recommends leaving space between contactors if the ambient temperature is between 50°C and 60°C.

10. Frequently Asked Questions (FAQ)

Q: What does '2NC' mean?

A: '2NC' stands for '2 Normally Closed' contacts. This means that the contactor has two sets of main contacts that are closed when the coil is de-energized and open when the coil is energized.

Q: What is the current consumption of the drive coil in 110V?

A: The current consumption of the drive coil (solenoid) varies depending on the specific model and its design. While the main circuit rating voltage is 110V or 220V, the coil's actual current draw is typically low (in milliamps) and is usually specified in the detailed technical data for each model. Please refer to the product's specific datasheet or contact EARU support for precise coil current values.

11. Warranty and Support

For warranty information, technical support, or any product-related inquiries, please contact the EARU Official Store or your authorized dealer. Keep your purchase receipt for warranty claims.