1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of your DIHOOL DHM1B-2P-160A-3 DC Main Circuit Breaker. Please read this manual thoroughly before installation and use, and retain it for future reference.
2. Safety Information
WARNING: Electrical shock hazard. Installation and maintenance should only be performed by qualified personnel.
- Always disconnect power before installing or servicing the circuit breaker.
- Ensure proper wiring and connections to prevent short circuits and overloads.
- Do not operate the circuit breaker if it is damaged or appears to be malfunctioning.
- Adhere to all local and national electrical codes.
- This device is designed for DC applications only. Do not use with AC systems.
3. Product Overview and Features
The DIHOOL DHM1B-2P-160A-3 is a 2-pole, 160 Amp DC main circuit breaker designed for various DC applications, including photovoltaic systems, UPS, battery banks, RVs, marine vessels, and power stations. It provides essential protection against circuit overload and short circuits.
Key Features:
- Thermal magnetic trigger for reliable protection.
- Circuit overload protection.
- Circuit short circuit protection.
- Isolation circuit functionality.
- Easy screw-in panel installation.
- Suitable for DC 12V-400V systems.
Image 3.1: Front view of the DIHOOL DHM1B-2P-160A-3 DC Main Circuit Breaker, showing the ON/OFF switch and product labeling.
4. Specifications
| Parameter | Value |
|---|---|
| Model Number | DHM1B-2P-160A-3 |
| Rated Operating Voltage | DC 12-400 V |
| Poles | 2P |
| Rated Current | 160 A |
| Cutting Capacity (Ics) | 15 kA |
| Cutting Capacity (Icu) | 25 kA |
| Usage Category | A |
| Mechanical Life | 6000 Times |
| Electrical Life | 1000 Times |
| Installation Method | Screw-in Panel Installation |
| Standard | IEC66 0947-.2 / GB14048.2 |
| Operating Temperature | -10°C to +50°C |
| Operating Altitude | 2000m |
| Product Dimensions | 15.01 x 19.99 x 14 cm (approx.) |
| Weight | 1.52 kg (approx.) |
Image 4.1: Diagram showing the dimensions of the circuit breaker (73mm width, 163mm height).
Image 4.2: Side view illustrating the 86mm depth of the circuit breaker.
5. Installation and Setup
The DIHOOL DHM1B-2P-160A-3 circuit breaker is designed for screw-in panel installation. Ensure the installation location is dry, well-ventilated, and protected from direct sunlight and extreme temperatures.
5.1 Wiring Connections:
- Preparation: Before making any connections, ensure all power sources are disconnected and verified to be off.
- Mounting: Securely mount the circuit breaker to a panel using appropriate screws.
- Wire Gauge: The terminals accept wire gauges from 16-70mm² (6 AWG - 2/0 AWG). Use appropriate wire sizes for the 160A current rating to prevent overheating.
- Connection: Connect the DC positive (+) and negative (-) cables to the corresponding terminals on the circuit breaker. Ensure connections are tight and secure. The circuit breaker supports "No Polarity" for DC 12V-240V applications, meaning input and output terminals can be connected without strict positive/negative orientation for the breaker itself, but the overall system polarity must be maintained.
- Verification: Double-check all connections for correctness and tightness before restoring power.
Image 5.1: Example wiring diagram showing the circuit breaker connected between a 12V/24V battery and a power inverter, illustrating typical DC application.
Image 5.2: Close-up of the circuit breaker terminals, indicating "No Polarity" for DC 12V-240V connections, highlighting flexibility in wiring.
Image 5.3: View of the circuit breaker with thick gauge wires connected to the terminals, demonstrating proper wire insertion.
6. Operating Instructions
The circuit breaker features a simple ON/OFF toggle switch and a TEST button for verifying functionality.
6.1 Switching ON/OFF:
- To switch the circuit breaker ON, push the handle UP.
- To switch the circuit breaker OFF, push the handle DOWN.
- Important Note: If the circuit breaker has tripped (due to overload or short circuit), the handle will be in an intermediate "Trip OFF" state. To reset, first push the handle fully DOWN to the OFF position, then push it UP to the ON position.
6.2 Using the TEST Button:
- The red "TEST" button is located on the front of the circuit breaker.
- To test the tripping mechanism, press the red "TEST" button. The circuit breaker should immediately trip to the "Trip OFF" state, interrupting the circuit.
- After testing, reset the circuit breaker by pushing the handle fully DOWN, then UP to the ON position.
- Regular testing (e.g., monthly) is recommended to ensure proper operation.
Image 6.1: Visual guide for operating the circuit breaker, showing the ON/OFF positions and the TEST button. It also illustrates the reset procedure after a trip.
7. Maintenance
The DIHOOL DHM1B-2P-160A-3 DC Main Circuit Breaker requires minimal maintenance. However, periodic checks are recommended to ensure continued safe and reliable operation.
- Visual Inspection: Regularly inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections.
- Terminal Tightness: Periodically check that all terminal connections are tight. Loose connections can lead to overheating and poor performance.
- Cleaning: If necessary, gently clean the exterior of the circuit breaker with a dry, soft cloth. Do not use abrasive cleaners or solvents.
- Functionality Test: Perform the TEST button procedure (Section 6.2) periodically to confirm the tripping mechanism is functional.
8. Troubleshooting
This section addresses common issues you might encounter with your circuit breaker.
- Issue: Circuit breaker trips frequently.
- Possible Cause: Overload in the circuit.
- Solution: Reduce the load on the circuit. Ensure the total current drawn does not exceed 160 Amps.
- Possible Cause: Short circuit in the wiring or connected device.
- Solution: Inspect all wiring and connected devices for short circuits. Repair or replace faulty components.
- Possible Cause: Faulty circuit breaker.
- Solution: If overload and short circuit issues are ruled out, the breaker itself might be faulty. Replace the circuit breaker.
- Issue: Circuit breaker does not switch ON.
- Possible Cause: The breaker is in the "Trip OFF" state.
- Solution: Push the handle fully DOWN to the OFF position, then push it UP to the ON position.
- Possible Cause: No power supply to the breaker.
- Solution: Check the upstream power source and connections.
- Issue: Circuit breaker feels hot.
- Possible Cause: Overload or loose connections.
- Solution: Immediately disconnect power. Check for overloads and tighten all terminal connections. If the issue persists, replace the breaker.
9. Warranty and Support
For warranty information or technical support, please contact DIHOOL customer service through your purchase platform or visit the official DIHOOL website. Please have your model number (DHM1B-2P-160A-3) and purchase details ready when contacting support.
