1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your EARU Residual Current Circuit Breaker (RCBO). This device is designed to provide comprehensive protection for electrical circuits against earth fault/leakage current, short-circuit, and overload conditions, ensuring safety in household and commercial distribution systems.
Please read this manual thoroughly before installation and use to ensure proper function and safety.
Video: Overview of the EARU Residual Current Circuit Breaker, demonstrating its physical features and operation.
2. Key Features and Construction
The EARU Residual Current Circuit Breaker is engineered with the following features:
- Provides protection against earth fault/leakage current, short-circuit, overload, and functions as an isolator.
- Equipped with a contact position indication for clear status visibility.
- Offers protection against indirect contact by human body.
- Provides complementary protection against direct contact by human body.
- Effectively protects electrical equipment against insulation failure.
- Features switched neutral and phase poles.
- Includes protection against over-voltage.
- Delivers comprehensive protection to household and commercial distribution systems.
Image: Visual representation of the three primary protection functions: Short Circuit, Overload, and Leakage Protection.
3. Technical Specifications
Refer to the table below for detailed technical data and dimensions of the circuit breaker models.
| Parameter | Specification |
|---|---|
| Type | Electronic type, Residual Current |
| Pole Number | 1P+N |
| Tripping Curve | C Type |
| Rated Short-Circuit Capacity | 6KA |
| Rated Current (A) | 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A |
| Rated Voltage | 230VAC |
| Rated Frequency | 50/60Hz |
| Rated Residual Operating Current | 30mA (15mA for 63A models) |
| Tripping Duration | Instantaneous (≤ 0.1s) |
| Over-voltage Tripping | 280V ± 5% |
| Connection Capacity (Flexible) | 10mm² |
| Connection Capacity (Rigid) | 16mm² |
| Mounting | Symmetrical DIN Rail 35mm, Panel mounting Accessories |
| Standard | IEC61009, GB6829 |
| Mechanical Lifespan | 20,000 cycles |
Image: Detailed dimensions for 6-32A models (75mm/2.95in height, 78mm/3.07in length, 45mm/1.77in width, 36mm/1.42in depth) and 40-63A models (75mm/2.83in height, 78mm/3.07in length, 45mm/1.77in width, 36mm/1.42in depth).
4. Installation Instructions
Installation should only be performed by a qualified electrician in accordance with local electrical codes and regulations. Ensure power is disconnected before beginning installation.
- Mounting: The circuit breaker is designed for installation on a symmetrical 35mm DIN rail. Align the clips on the back of the breaker with the DIN rail and press firmly until it clicks into place.
- Wiring: Refer to the wiring diagram printed on the device and the detailed component diagram below. Connect the neutral (N) and live (L) wires to the appropriate wiring terminals. Ensure all connections are secure by tightening the screws. The terminal connection height is H1=16mm and H2=21mm.
- Conductor Capacity: Use flexible conductors up to 10mm² or rigid conductors up to 16mm².
- Verification: After wiring, double-check all connections for correctness and tightness before restoring power.
Image: Detailed view of the circuit breaker, highlighting Wiring Terminals, Testing Buttons, Wiring Diagram, Execution Standards, Window Indication, Flame Retardant Housing, Tighten Screws, Brand Name, Product Model, Rated Current, Breaking Capacity, and Operating Handle.
Image: Example of circuit breakers correctly mounted on a 35mm DIN rail.
5. Operation
- Switching On/Off: The operating handle (red lever) controls the circuit. Push it up to the 'ON' position to close the circuit and supply power. Push it down to the 'OFF' position to open the circuit and cut power.
- Tripped State: If the circuit breaker trips due to an overload, short-circuit, or leakage current, the operating handle will move to an intermediate position or fully to 'OFF'. The window indication may also change color (e.g., from green to red) to indicate a fault.
- Resetting: To reset a tripped breaker, first move the operating handle fully to the 'OFF' position, then push it up to the 'ON' position. If the breaker immediately trips again, do not force it. Investigate the cause of the trip.
- Test Button: A 'test monthly' button (typically orange or yellow) is located on the front of the device. Pressing this button simulates an earth fault and should cause the breaker to trip. This confirms the leakage protection mechanism is functioning correctly.
6. Maintenance
The EARU Residual Current Circuit Breaker requires minimal maintenance. The most important maintenance task is regular testing:
- Monthly Test: Press the 'test monthly' button on the front of the device at least once a month. The breaker should trip immediately. If it does not trip, the device may be faulty and should be replaced by a qualified electrician.
- Visual Inspection: Periodically inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections. Any issues should be addressed by a qualified professional.
7. Troubleshooting
If your circuit breaker is not functioning as expected, consider the following:
- Breaker Trips Immediately After Reset: This indicates a persistent fault in the circuit. Do not repeatedly reset the breaker. Common causes include:
- Overload: Too many devices drawing power from the circuit. Disconnect some devices.
- Short-Circuit: A direct connection between live and neutral wires, or live and earth. This requires immediate investigation by an electrician.
- Earth Fault/Leakage: Current leaking to earth, often due to damaged insulation or faulty appliances. Disconnect appliances one by one to identify the faulty one.
- Breaker Does Not Trip When Test Button is Pressed: The leakage protection mechanism may be faulty. The device should be replaced immediately by a qualified electrician.
- No Power to Circuit, Breaker is ON: Check upstream circuit breakers or fuses. Ensure all wiring connections to the RCBO are secure.
For any persistent issues or if you are unsure about the cause of a fault, consult a qualified electrician.
8. User Tips
- Always verify the specific model number and its stated protections (e.g., short circuit, overload, leakage) upon receipt to ensure it matches your requirements.
- Regularly performing the monthly test is crucial for ensuring the earth leakage protection is active and reliable.
- If the breaker trips frequently, it's a sign of an underlying electrical issue that needs professional attention, not just a nuisance trip.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.