1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your MARSTEK Smart Circuit Breaker HF-00095. This device offers adjustable overvoltage, undervoltage, and overcurrent protection, along with energy monitoring capabilities, to safeguard your electrical equipment.
2. Important Safety Information
Please read and understand all safety instructions before installing or operating the device. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Installation should only be performed by a qualified electrician.
- Ensure all power to the circuit is disconnected at the main breaker before installation or maintenance.
- Do not operate the device if it appears damaged.
- Adhere to all local electrical codes and regulations.
- This device is designed for AC circuits within specified voltage and current ranges.
3. Product Overview and Features
The MARSTEK Smart Circuit Breaker HF-00095 is designed to provide intelligent protection and monitoring for your electrical circuits. It features a digital display for real-time voltage and current, and allows for customizable protection settings.

- Real-Time Voltage Display: Shows the current voltage.
- Real-Time Current Display: Shows the current amperage.
- Work Indicator Lights: Indicate operational status and protection events.
- SET Button: Long press to enter settings mode.
- Up and Down Keys: Used to adjust overvoltage, undervoltage, and overcurrent values.
- Manual Power Off Button: Allows for manual disconnection of the circuit.
Key features include:
- Tailored Protection: Customize overvoltage, undervoltage, and overcurrent values to suit specific requirements.
- Default Settings: Pre-set values for convenience - Overvoltage Trip at 140V, Undervoltage Trip at 90V, and Overcurrent Trip at 63A.
- Intelligent Recovery: After power events, the circuit automatically restores itself within 30 seconds, ensuring continuous power supply.
- User-Friendly Setup: Clear setting instructions are provided on the product's side for quick adjustments.
4. Technical Specifications

| Parameter | Value |
|---|---|
| Supply Terminals | N, L |
| Rated Supply Voltage | AC 110V; DC 85-300V |
| Rated Frequency | 40/50/60/70Hz |
| >U Setting Range (Overvoltage) | AC130-300V; DC130-300V |
| <U Setting Range (Undervoltage) | AC80-210V; DC85-210V |
| Voltage Hysteresis | 5V |
| Overvoltage Trip Delay | 0.5s |
| Voltage Accuracy | <1% |
| Max. Operating Phase Voltage | 350V |
| Max. Operating Current | 40A/63A |
| Altitude | ≤2000m |
| Function | Lightning Protection |
| Permissible Relative Humidity | ≤50% at 40°C (Without Condensation) |
| Ambient Temperature | -25°C ~ +55°C |
| Net Weight | 159g |
| Size | 81*36*66mm |
5. Installation and Wiring
Proper installation is crucial for the safe and effective operation of the MARSTEK Smart Circuit Breaker. Refer to the wiring diagram below and follow all safety precautions.

Installation Steps:
- Power Disconnection: Before starting any electrical work, ensure all power to the circuit is completely disconnected at the main service panel. Verify with a voltage tester.
- Mounting: Mount the circuit breaker securely in a suitable electrical enclosure or panel. The device is designed for DIN rail mounting or screw mounting.
- Input Wiring: Connect the incoming Neutral (N) wire to the terminal marked 'N IN' and the incoming Live (L) wire to the terminal marked 'L IN'.
- Output Wiring: Connect the outgoing Neutral (N) wire from the terminal marked 'N OUT' and the outgoing Live (L) wire from the terminal marked 'L OUT' to the load you wish to protect.
- Secure Connections: Ensure all terminal screws are tightened securely to prevent loose connections, which can cause overheating or intermittent operation.
- Power Restoration: Once all connections are verified and secure, restore power to the circuit at the main service panel.
6. Operation and Parameter Settings
Upon power-up, the device will display real-time voltage and current. You can adjust the protection parameters to suit your specific needs.
Adjusting Protection Parameters:
- Enter Settings: Long press the SET button until the display changes, indicating entry into the settings menu.
- Navigate Parameters: Use the Up (▲) and Down (▼) buttons to cycle through the available parameters (e.g., overvoltage trip value, undervoltage trip value, overcurrent trip value, recovery delay time).
- Select Parameter: Press the SET button briefly to select the currently displayed parameter for adjustment.
- Adjust Value: Use the Up (▲) and Down (▼) buttons to change the parameter's value.
- Confirm and Exit: Press SET again to confirm the new value and move to the next parameter. To exit the settings menu at any time, long press the SET button.
Default Protection Settings:
- Overvoltage Trip: 140V
- Undervoltage Trip: 90V
- Overcurrent Trip: 63A
- Automatic Recovery Delay: 30 seconds
Automatic Reset Function:
In the event of an overvoltage, undervoltage, or overcurrent condition, the circuit breaker will automatically cut off power to protect the connected load. After a default delay of 30 seconds, the device will attempt to restore power. If the fault condition persists, it will remain disconnected and attempt to reset again after another delay.

- Upon detection of overvoltage, undervoltage, or overcurrent, the circuit is cut off.
- A default delay of 30 seconds begins.
- After 30 seconds, the circuit attempts to reset automatically. If the abnormality is resolved, power is restored. If the abnormality persists, the device continues to wait before another reset attempt.
7. Maintenance
The MARSTEK Smart Circuit Breaker HF-00095 requires minimal maintenance to ensure optimal performance and longevity.
- Regular Inspection: Periodically inspect the device for any visible damage, discoloration, or loose wiring connections. Address any issues promptly.
- Cleaning: Ensure the ventilation openings are clear of dust and debris to prevent overheating. Clean the display and exterior with a soft, dry cloth. Do not use abrasive cleaners, solvents, or liquids directly on the device.
- Environmental Conditions: Ensure the device operates within the specified ambient temperature and humidity ranges to prevent malfunction.
8. Troubleshooting
If you encounter issues with your MARSTEK Smart Circuit Breaker, refer to the following troubleshooting guide:
- Device not powering on:
- Check if the main circuit breaker supplying power to the device is in the ON position.
- Verify that the input (IN) wiring connections are secure and correctly wired.
- Ensure the supply voltage is within the rated range (AC 110V; DC 85-300V).
- Circuit trips frequently:
- Review your set overvoltage, undervoltage, and overcurrent parameters. Ensure they are appropriate for your connected load and typical operating conditions.
- Check for actual electrical faults (e.g., short circuits, overloads) in the connected circuit or appliance.
- Ensure the load current does not exceed the maximum operating current (63A).
- Display not showing correct values or is blank:
- Verify all wiring connections are secure and correct.
- If the issue persists after checking connections and power, the device may require service.
- Device does not reset automatically:
- Ensure the fault condition (overvoltage, undervoltage, overcurrent) has been resolved. The device will not reset if the fault persists.
- Check the automatic recovery delay setting.
9. Warranty and Support
For detailed warranty information regarding your MARSTEK Smart Circuit Breaker HF-00095, please refer to the product packaging or visit the official MARSTEK website.
For technical support, troubleshooting assistance, or any other inquiries, please contact MARSTEK customer service through their official contact channels, which can typically be found on their website or product documentation.