1. Introduction
This manual provides comprehensive instructions for the safe installation, operation, and maintenance of the dihool DHM1X series Molded Case Circuit Breaker (MCCB). This device is designed to provide reliable isolation, overload, and short-circuit protection for various electrical equipment in both DC and AC applications, including photovoltaic power generation systems, wind power generation systems, rail transit power distribution systems, and general infrastructure construction.
Please read this manual thoroughly before installation and operation to ensure proper use and to prevent potential hazards.
2. Safety Information
WARNING: Electrical shock hazard. Only qualified personnel should install or service this equipment.
- Always disconnect power before working on the circuit breaker or connected equipment.
- Ensure proper grounding and wiring according to local and national electrical codes.
- Do not operate the circuit breaker if it appears damaged or is not functioning correctly.
- Wear appropriate personal protective equipment (PPE) when working with electrical systems.
- The circuit breaker is designed for specific voltage and current ratings. Do not exceed these ratings.
3. Product Overview
The dihool DHM1X series MCCB is a robust device featuring high-quality components for reliable performance.
Figure 3.1: Key Components of the DHM1X Circuit Breaker
Key features and components include:
- Conducting Part: The contacts are silver plated with copper, ensuring good electrical conductivity.
- Flame Retardant Shell: The casing is made from flame-retardant material for enhanced safety and durability.
- Operating Handle: Designed for ease of use, resistant to high temperatures, and provides good insulation.
- Test Button: Allows for periodic testing of the tripping and breaking capacity to ensure line safety.
- Tunnel Type Terminals: Features silver alloy contacts for better electrical conductivity and safer connections.
Figure 3.2: Product Characteristics and Certifications
The product complies with mandatory product certification IEC/EN 60947-2.
4. Specifications
The DHM1X series MCCB is available in various current ratings. General specifications are listed below:
| Attribute | Value |
|---|---|
| Brand Name | dihool |
| Model Number | DHM1X |
| Type | Moulded Case Circuit breaker |
| Poles | 2P (+ and -) or (L and N) |
| Rated Voltage Ue | AC480V / DC500V (Max 690V) |
| Insulation Voltage Ui | 1000V |
| Rated Impulse Withstand Voltage (1.2/50)Uimp | 8kV |
| Rated operating short-circuit breaking capacity Icu | 25kA |
| Rated Breaking Capacity (Ics) | 20kA |
| Thermo-Magnetic Release Characteristic | A-Curve (8-12In) |
| Certification | CE, UL, IEC/EN 60947-2 |
| Is Smart Device | No |
4.1. Dimensions and Conductive Part Thickness
Figure 4.1: DHM1X-125 (100A/120A) Dimensions (approx. 150mm H x 65mm W x 62mm D) and 2.5mm conductive part thickness.
Figure 4.2: DHM1X-250 (160A/200A/250A) Dimensions (approx. 164mm H x 74mm W x 80mm D) and 5mm conductive part thickness.
5. Setup and Installation
Proper installation is crucial for the safe and effective operation of the circuit breaker. Refer to the following guidelines and diagrams.
5.1. Wiring Diagrams
The DHM1X series supports both DC and AC voltage modes. Ensure correct polarity for DC systems and proper phase connection for AC systems.
Figure 5.1: Wiring examples for DC (12-500V, e.g., battery system) and AC (90-480V, e.g., AC220V motor) applications.
5.2. Wire Selection and Connection
Use appropriate wire gauges to ensure safe and efficient current flow. The minimum adapter copper wire size is 50 MM² / 0AWG. Refer to the suggested wire sizes for specific current ratings:
Figure 5.2: Recommended wire gauges for different current ratings.
- 100A: 6AWG (16MM²)
- 120A: 6AWG (16MM²)
- 160A: 4AWG (25MM²)
- 200A: 2AWG (35MM²)
- 250A: 2AWG (35MM²)
Ensure all connections are tight and secure to prevent loose contacts and overheating. Use the provided screws and Allen key for installation.
6. Operating Instructions
The circuit breaker is designed for simple and intuitive operation.
Figure 6.1: Operating the DHM1X Circuit Breaker Handle and Test Button.
- Switching On: Push the operating handle UP to switch the circuit breaker ON.
- Switching Off: Push the operating handle DOWN to switch the circuit breaker OFF.
- Tripping: In case of an overload or short circuit, the handle will automatically move to the TRIP OFF position (mid-position).
- Resetting after Trip: If the handle is in the TRIP OFF state, it is unable to be pushed directly UP to ON. First, push the handle fully DOWN (to OFF position), then push it UP to the ON position to restore power.
- Test Button: Periodically press the RED test button to verify the tripping mechanism is functional. The handle should move to the TRIP OFF position. After testing, reset the breaker as described in step 4.
7. Maintenance
Regular maintenance helps ensure the longevity and reliable operation of your circuit breaker.
- Visual Inspection: Periodically inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections.
- Cleaning: Keep the circuit breaker clean and free from dust and debris. Use a dry, non-abrasive cloth for cleaning. Do not use liquids or solvents.
- Terminal Checks: Ensure all terminal connections remain tight. Loose connections can lead to overheating and potential hazards.
- Functionality Test: Perform the test button operation periodically (e.g., every 6-12 months) to confirm the tripping mechanism is working correctly.
- Environmental Conditions: Ensure the operating environment is within the specified temperature and humidity ranges to prevent premature wear or malfunction.
8. Troubleshooting
Here are some common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Circuit breaker trips frequently. | Overload, short circuit, ground fault, or faulty appliance. | Reduce load on the circuit. Check for short circuits or ground faults in wiring or connected appliances. Disconnect faulty appliances. |
| Circuit breaker does not reset after tripping. | Still an active fault, or handle not fully pushed to OFF before attempting to reset. | Ensure the handle is pushed fully DOWN to the OFF position before attempting to push it UP to ON. If it still doesn't reset, there might be a persistent fault or internal damage. Consult a qualified electrician. |
| No power to circuit, but breaker is ON. | Loose wiring connection, fault in the circuit downstream, or internal breaker failure. | Check all wiring connections for tightness. Inspect the circuit for any breaks or damage. If all else fails, the breaker itself might be faulty and require replacement by a professional. |
| Test button does not trip the breaker. | Internal mechanism failure. | The circuit breaker may be faulty and should be replaced immediately by a qualified professional. |
9. User Tips
- Always verify the voltage and current ratings of your system match the circuit breaker's specifications before installation.
- For DC applications, pay close attention to polarity to ensure correct operation and safety.
- Consider labeling your circuit breaker for easy identification of the protected circuit.
10. Applications
The dihool DHM1X series MCCB is versatile and suitable for a wide range of applications requiring reliable circuit protection:
Figure 10.1: Common applications for the DHM1X Circuit Breaker.
- Photovoltaic power generation systems
- Wind power generation systems
- Rail transit power distribution systems
- General infrastructure construction
- Battery systems (DC applications)
11. 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.
