1. Product Overview
The DIHOOL DHM3Z-320A is a 320 Amp DC Circuit Breaker designed for robust electrical system protection. This 2-pole, 1000V device features a 20kA breaking capacity and a thermal magnetic trip mechanism, making it suitable for various high-power DC applications.
Key Features:
- Bidirectional Switch: Capable of tripping effectively during short circuits on both supply and load sides, mitigating overheating and fire risks.
- High-Capacity DC Circuit Breaker: Provides reliable overload and short-circuit protection for heavy-duty DC electrical systems.
- Thermal Magnetic Trip: Advanced technology ensures precise protection against circuit overloads and short circuits.
- Silver Contacts: Features 50% silver in moving contacts and 85% silver in stationary contacts for superior conductivity, durability, and corrosion resistance.
- High Voltage & Breaking Capacity: Operates at 1000V with a 20kA short-circuit breaking capacity at 1000V.
- Versatile Application: Suitable for photovoltaic systems, batteries, UPS systems, RVs, marine equipment, and trucks.
2. Package Contents
Verify that all items are present in the package before installation.
- 1 x DIHOOL DHM3Z-320A 320 Amp DC Circuit Breaker (MCCB)
- 2 x Clapboards
3. Specifications
| Specification | Value |
|---|---|
| Brand | DIHOOL |
| Model | DHM3Z-320A |
| Current Rating | 320 Amps |
| Voltage Rating | 1000V DC |
| Breaking Capacity | 20kA at 1000V |
| Number of Poles | 2 |
| Circuit Breaker Type | Standard, Thermal Magnetic Trip |
| Mounting Type | Screw Mount |
| Product Dimensions (D x W x H) | 6.3" x 9.06" x 5.15" (160mm x 230mm x 131mm approx.) |
| Item Weight | 2.2 Kilograms |
| Included Components | Arc barrier |
4. Installation
4.1 Safety Precautions
- Ensure all power sources are disconnected before installation.
- Installation should be performed by qualified personnel in accordance with local electrical codes and regulations.
- Wear appropriate personal protective equipment (PPE), including insulated gloves and eye protection.
- Verify correct polarity when connecting DC circuits.
4.2 Wiring Diagram
Refer to the following diagram for typical wiring connections in a solar power system. The circuit breaker should be installed between the battery/inverter and the load/utility power as shown.
4.3 Mounting Methods
The DHM3Z-320A circuit breaker is designed for screw mounting. Choose an appropriate mounting surface and hardware based on the installation environment.
- Plastic Sheeting: Use screws and nuts for secure attachment.
- Vertical Wooden Board: Use expansion screws and self-tapping screws.
- Iron Plate: Use screws and nuts.
5. Operation
The circuit breaker features a toggle handle for switching the circuit on and off, and a red button for manual tripping.
- To Switch OFF: Push the handle DOWN. This disconnects the circuit.
- To Switch ON: Push the handle UP. This connects the circuit.
- To Trip Manually: Press the RED button. This will immediately open the circuit, regardless of the handle position.
Important Note: If the circuit breaker is in a tripped (OFF) state, you may be unable to push the handle directly UP to the ON position. In such cases, first push the handle fully DOWN to reset the mechanism, then push it UP to restore power.
6. Features and Technology
6.1 High-Strength Plastic Shell
The circuit breaker is encased in a high flame-retardant plastic shell, offering excellent insulation performance and protection. This design ensures durability and reliable operation in outdoor environments and various weather conditions.
6.2 Silver Contacts and Arc Separators
The device incorporates silver contacts for high current carrying capacity and improved conductivity. High-quality arc separators with thickened copper parts are used to ensure a more stable current flow and enhanced arc extinguishing performance.
6.3 Thickened Arc Extinguishing Hood
The circuit breaker features a thickened arc extinguishing hood, which provides superior arc extinguishing performance compared to standard designs. This enhances safety and reliability during fault conditions.
6.4 Tripping Sensitivity
The DHM3Z-320A DC Circuit Breaker offers a tripping sensitivity of 0.1 to 0.2 seconds, providing rapid protection against electrical faults.
7. Applications
The DIHOOL DHM3Z-320A DC Circuit Breaker is suitable for a variety of demanding DC applications, including:
- Photovoltaic (Solar) Power Generation Systems
- Wind Power Generation Systems
- Rail Transit Power Distribution Systems
- Infrastructure Construction
- UPS Systems
- Battery Banks
- RVs and Marine Equipment
8. Maintenance
Regular inspection of the circuit breaker is recommended to ensure optimal performance and safety. Check for any signs of physical damage, loose connections, or discoloration. Keep the area around the circuit breaker clean and free from obstructions. Do not attempt to repair the circuit breaker yourself; contact a qualified electrician if maintenance or repair is required.
9. Troubleshooting
If the circuit breaker trips frequently or fails to operate correctly, consider the following:
- Frequent Tripping: This may indicate an overload or a short circuit in the connected system. Disconnect loads and check for faults. Ensure the total current draw does not exceed the breaker's rated capacity.
- Failure to Reset: If the breaker does not reset after pushing the handle down and then up, there might be a persistent fault or internal damage.
- Overheating: Check for loose connections or excessive current draw.
For any persistent issues or complex problems, consult a qualified electrician or contact DIHOOL customer support.
10. Warranty and Support
For warranty information and technical support, please refer to the product packaging or contact DIHOOL customer service directly. Keep your purchase receipt for warranty claims.