1. Introduction
The ETEK EKM3-63 Miniature Circuit Breaker (MCB) is designed to provide reliable protection against overcurrents and short circuits in electrical installations. This manual provides essential information for the safe and effective installation, operation, and maintenance of your EKM3-63 MCB. Please read this manual thoroughly before installation and keep it for future reference.
Figure 1: EKM3-63 Miniature Circuit Breaker Series (1-63A)
2. Safety Information
Always observe the following safety precautions to prevent injury or damage to the device:
- Installation and maintenance should only be performed by qualified electricians.
- Always disconnect power to the circuit before installing, servicing, or removing the MCB.
- Do not operate the MCB if it appears damaged or has been subjected to excessive force.
- Ensure proper wiring and tightening of terminals to prevent loose connections and overheating.
- The MCB is designed for overcurrent and short circuit protection. It is not intended for frequent switching operations.
- The flame-retardant PC material shell is designed to self-extinguish in case of open fire, enhancing safety.
Figure 2: EKM3-63 Safety Features
Figure 3: Flame Retardant PC Material Shell
3. Specifications
| Feature | Description |
|---|---|
| Type | Mini Circuit Breaker |
| Model | EKM3-63 |
| Brand | ETEK |
| Type of Protection | Overcurrent and Short Circuit |
| Number of Poles | 3P (Available in 1P, 1P+N, 2P, 3P, 3P+N, 4P) |
| Rated Currents | 16A, 25A, 40A, 63A (Also available in 1,2,3,4,5,6,10,20,32,50A) |
| Rated Voltage | 220V / 240V / 415V~ |
| Rated Frequency | 50/60Hz |
| Thermal Release Characteristic | (1.13-1.45) x In |
| Magnetic Release Characteristic | C:(5-10) x In (Also available in B:(3-5) x In) |
| Electrical Life | 8,000 Cycles |
| Mechanical Life | 20,000 Cycles |
| Max. Terminal Size for Cable | 25mm² |
| Max. Tightening Torque | 2.5 N.m |
| Ambient Temperature | -5°C to +40°C (Max. 95% humidity) |
| Installation | 35mm DIN rail mounting |
| Certifications | CE, WEEE |
Figure 4: Product External Parsing and Specifications
4. Installation
The EKM3-63 MCB is designed for easy installation on a standard 35mm DIN rail. Follow these steps:
- Power Disconnection: Ensure that the main power supply to the circuit is completely disconnected before beginning installation. Verify with a voltage tester.
- Mounting: Align the MCB with the 35mm DIN rail. Use the adjustable buckle mechanism: one pull and one press to snap the MCB securely onto the rail.
- Wiring: Connect the incoming and outgoing electrical wires to the designated connecting terminals. The terminals are located at the top and bottom of the MCB. Ensure that the wire size does not exceed 25mm² and that all connections are tightened to a maximum torque of 2.5 N.m. Refer to Figure 5 for terminal locations.
- Verification: Double-check all connections for tightness and correct polarity.
- Restore Power: Once installation is complete and verified, restore power to the circuit.
Figure 5: 35mm DIN Rail Snap Installation
Figure 6: Structure Introduction and Terminal Locations
5. Operating Instructions
The EKM3-63 MCB features a simple ON/OFF operation with a visual indicator for status.
- Turning ON: Push the handle upwards to the 'ON' position. The indicator window will show RED, indicating the circuit is connected and energized.
- Turning OFF: Push the handle downwards to the 'OFF' position. The indicator window will show GREEN, indicating the circuit is disconnected and de-energized.
- Tripping: In case of an overcurrent or short circuit, the MCB will automatically trip to the 'OFF' position, and the indicator will show GREEN. This rapid power outage protects your electrical system.
Figure 7: Indicator Window (ON/OFF Status)
Figure 8: Ergonomic Handle Design
6. Maintenance
The EKM3-63 MCB requires minimal maintenance. Regular inspection is recommended to ensure optimal performance and safety.
- Visual Inspection: Periodically check the MCB for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the MCB clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquid cleaners or solvents.
- Terminal Tightness: Occasionally check the tightness of the terminal screws, especially after initial installation and during routine electrical system checks.
- Functionality Test: If possible, periodically test the trip mechanism by using a dedicated test button (if available on your model) or by simulating an overload under controlled conditions (only by a qualified professional).
7. Troubleshooting
If your EKM3-63 MCB trips or does not operate as expected, consider the following:
- MCB Trips Frequently:
- Overload: The circuit may be drawing too much current. Disconnect some appliances or devices from the circuit.
- Short Circuit: A short circuit may exist in the wiring or an appliance. Inspect the wiring and connected devices for faults.
- Faulty Appliance: An appliance connected to the circuit might be defective. Disconnect appliances one by one to identify the faulty one.
- Incorrect Rating: Ensure the MCB's rated current matches the circuit's requirements. An undersized MCB will trip frequently.
- MCB Does Not Reset:
- Persistent Fault: The fault (overload or short circuit) may still be present. Do not force the handle to the ON position. Identify and clear the fault first.
- Internal Damage: If no fault is found and the MCB still won't reset, it may be internally damaged and needs replacement.
- MCB Feels Hot:
- Overload: The circuit is overloaded.
- Loose Connections: Check terminal tightness. Loose connections can cause resistance and heat buildup.
If you are unable to resolve the issue, consult a qualified electrician.
8. User Tips
- Select Correct Amperage: Always ensure you choose an MCB with the appropriate rated current (e.g., 16A, 25A, 40A, 63A) for your specific circuit to prevent nuisance tripping or inadequate protection.
- Pole Configuration: Verify the required number of poles (e.g., 3P for three-phase systems) for your application before purchase and installation.
9. Warranty and Support
For warranty information or technical support, please contact your retailer or the ETEK Official Store directly. Ensure you have your product model (EKM3-63) and purchase details available when contacting support.
Figure 9: Product Certifications (CE, CB)
