1. Introduction
The EARU EACT series household modular AC contactor is primarily designed for AC 50Hz or 60Hz circuits with a rated operating voltage of 230V. It supports rated operating currents up to 25A for AC7a usage and up to 10A for AC7b usage. This contactor is suitable for circuits with a breaking capacity below 6kA and is used for remotely connecting or disconnecting electrical circuits in smart home and hotel applications.
Figure 1: Overview of EARU EACT series AC contactors and an auxiliary contact
2. Safety Information
- Installation and maintenance should only be performed by qualified personnel.
- Ensure power is disconnected before any installation, wiring, or maintenance work.
- Verify that the product specifications match your application requirements before installation.
- Tighten all binding screws securely during connection to prevent loosening.
- Do not operate the device if it is damaged or shows signs of malfunction.
3. Product Overview
The EACT series modular AC contactors are designed for household and similar installations. They can be used independently or combined with auxiliary contacts for enhanced functionality.
3.1 Main Contactor Components
Figure 2: EACT-25 Contactor with Labeled Components
- Coil Contact (A1, A2): Terminals for connecting the control voltage to energize the coil.
- Main Contact Access (R1, 1, N, L): Input terminals for the main power circuit.
- Main Contact Output (R2, 2, N, L): Output terminals for the main power circuit.
- Indication Window: Visual indicator for contactor status (ON/OFF).
- Rated Current (Ie): Maximum continuous current the main contacts can carry.
- Voltage Rating (Ue): Rated operational voltage.
- Insulation Voltage (Ui): Maximum voltage the insulation can withstand.
- Approval Standard: Compliance with relevant electrical standards (e.g., EN61095, IEC61095).
- Normally Open Point / Normally Closed Point: Indicates the default state of the contacts when the coil is de-energized.
3.2 Auxiliary Contact
Auxiliary contacts can be attached to the main contactor to provide additional switching capabilities, such as signaling or interlocking.
Figure 3: Front view of an EARU Auxiliary Contact
4. Specifications
| Feature | Specification |
|---|---|
| Product Model | EACT-2P-2NO-16A/20A/25A, EACT-2P-1NO1NC-16A/20A/25A, EACT-2P-2NC-16A/20A/25A |
| Brand Name | EARU |
| Electricity Type | AC |
| Number of Pole | 2 (Also available in 1P, 3P, 4P variants) |
| Main Circuit Rating Current | 16A, 20A, 25A |
| Main Circuit Rating Voltage (Ue) | 220V / 230V AC (for 1P, 2P: 250V AC; for 3P, 4P: 400V AC) |
| Rated Frequency | 50/60Hz |
| Insulation Voltage (Ui) | 500V AC |
| Electrical Endurance (O-C) | 100,000 cycles |
| Max. Switching Operations per Day | 100 |
| Rated Impulse Withstand Voltage (Uimp) | 2.5kV (4 kV for 12/24/48VAC versions) |
| Pollution Degree | 2 |
| Degree of Protection (IEC 61095) | IP20 |
| Degree of Protection (Device in modular enclosure) | IP40 |
| Operating Temperature | -5°C to +60°C (Average temperature no more than +35°C in 24 hours) |
| Storage Temperature | -40°C to +70°C |
| Tropicalization (IEC 60068-1) | Treatment 2 (relative humidity 95% at 55°C) |
| ELSV Compliance | For 12/24/48VAC versions, product control conforms to SELV (safety extra low voltage) requirements. |
| Certification | CE |
| Altitude | No more than 2000m |
| Atmospheric Conditions | Relative humidity no more than 50% at +40°C; higher humidity allowed at lower temperatures. Monthly average minimum temperature in wettest month not exceeding +25°C, and monthly average maximum relative humidity not more than 90%. |
| Installation Condition | Class II |
4.1 Dimensions
Figure 4: Main Contactor Dimensions
Figure 5: Auxiliary Contact Dimensions
4.2 Contactor Types and Configurations
Figure 6: Contactor Types and Configurations
5. Installation
Before installation, ensure the contactor agrees with the scope of application and the working conditions. Always disconnect power before proceeding.
5.1 DIN Rail Mounting
- Pull down the motion stopping component (yellow tab) on the contactor.
- Place the contactor onto the 35mm DIN rail.
- Push up the motion stopping component to fix the contactor securely on the DIN rail. Ensure it is firmly seated to avoid loosening or dropping.
- To remove the contactor, pull down the motion stopping component again.
Figure 7: DIN Rail Mounting
5.2 Attaching Auxiliary Contacts
Auxiliary contacts can be easily attached to the side of the main contactor.
- Align the auxiliary contact with the side of the main contactor, ensuring the interlocking mechanisms match.
- Gently push the auxiliary contact onto the main contactor until it clicks into place.
- Verify that both units are securely connected.
Figure 8: Contactor and Auxiliary Contact Combination
Video 1: Demonstration of attaching an auxiliary contact to a main contactor.
5.3 Wiring Connections
Ensure correct wiring mode and securely screw down all binding screws during connection.
| Type | Rating | Lenght tripping | Circuit | Tightening torque | Copper cables (Rigid) | Copper cables (Flexible or ferrule) |
|---|---|---|---|---|---|---|
| PZ1:4mm | 16-100A | 9mm | Control | 0.8N.m | 1.5 to 2.5mm² | 1.5 to 2.5mm² |
| PZ2:6mm | 40-63A 100A | 14mm | Power | 3.5N.m | 1 to 6mm² 6 to 35mm² | 1 to 4mm² 6 to 16mm² |
| PZ1:4mm | 9mm | 0.8N.m | 1.5 to 2.5mm² 2 x 1.5mm² | 1.5 to 2.5mm² 2 x 1.5mm² |
Table 1: Connection Technical Data
6. Wiring Diagrams
6.1 1NO1NC Wiring Schematic
Figure 9: 1NO1NC Wiring Schematic
In this configuration, when coils A1 and A2 are energized, Load 1 is energized, and Load 2 is de-energized.
6.2 2NO Wiring Schematic
Figure 10: 2NO Wiring Schematic
In this configuration, when coils A1 and A2 are energized, the load is also energized.
7. Operating Instructions
The AC contactor functions by energizing its coil, which then closes (or opens, depending on contact type) the main contacts, allowing power to flow to the connected load. When the coil is de-energized, the contacts return to their default state.
- To Energize: Apply the specified control voltage (e.g., 230V AC) across the coil terminals (A1 and A2). The indication window will typically show a change in color or position.
- To De-energize: Remove the control voltage from the coil terminals. The contacts will revert to their original state.
8. Maintenance
Regular inspection and proper maintenance can extend the lifespan of your AC contactor.
- Visual Inspection: Periodically check for any signs of physical damage, discoloration, or loose connections.
- Terminal Tightness: Ensure all terminal screws remain tight. Loose connections can lead to overheating and device failure.
- Cleanliness: Keep the contactor free from dust and debris, especially around ventilation openings.
- Operational Check: Occasionally verify that the contactor operates smoothly and the indication window changes state correctly.
9. Troubleshooting
If you encounter issues with your AC contactor, consider the following common problems and solutions:
- Contactor Not Energizing:
- Check if the control voltage is correctly applied to terminals A1 and A2.
- Verify that the control voltage matches the rated coil voltage of the contactor.
- Inspect for loose wiring connections at the coil terminals.
- Contactor Energizes but Load Does Not Receive Power:
- Ensure the main power circuit is connected to the correct input (R1, 1, N, L) and output (R2, 2, N, L) terminals.
- Check for continuity across the main contacts when the coil is energized.
- Verify that the load itself is functioning correctly.
- Overheating:
- Check for loose terminal connections and tighten them if necessary.
- Ensure the contactor's rated current is not exceeded by the load.
- Verify proper ventilation around the contactor, especially if mounted in an enclosure. Consider using a spacer if the enclosure temperature is high.
10. User Tips
Based on common user inquiries, here are some helpful tips:
- Coil Voltage: The EACT series contactors are available with various coil voltages (e.g., 12V, 24V, 110V, 220V/230V). Always confirm the specific coil voltage of your model before connecting the control circuit. Connecting an incorrect voltage can damage the coil.
- Application: These modular contactors are ideal for controlling lighting, heating, ventilation, and other non-motorized loads in residential and commercial buildings.
11. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's official website or contact their customer service department. Keep your purchase receipt as proof of purchase.
