TOMZN TOB7Z-63 2P DC 1000V Solar Mini Din Rail Circuit Breaker

1. Introduction

This manual provides essential information for the safe and effective installation, operation, and maintenance of the TOMZN TOB7Z-63 2P DC 1000V Solar Mini Din Rail Circuit Breaker. This device is designed to protect direct current (DC) circuits in photovoltaic (PV) systems from overcurrents and short circuits, ensuring the safety and longevity of your solar installation.

Please read this manual thoroughly before installation and retain it for future reference.

2. Safety Information

WARNING: Electrical shock hazard. Only qualified personnel should perform installation and maintenance procedures. Failure to follow these instructions may result in serious injury or death.

• Always disconnect all power sources before working on the circuit breaker or associated wiring.
• Ensure proper grounding and adhere to all local and national electrical codes.
• Use appropriate personal protective equipment (PPE), including insulated gloves and eye protection.
• Verify that the circuit breaker's voltage and current ratings match your system requirements.
• Do not operate the circuit breaker if it appears damaged or has been exposed to moisture.

3. Product Overview

The TOMZN TOB7Z-63 is a 2-pole DC miniature circuit breaker designed for reliable protection in solar PV applications. It features a robust construction suitable for outdoor conditions and clear indicators for operational status.

Figure 1: Front view of the TOMZN TOB7Z-63 DC Circuit Breaker, showing the two poles and operating handles.

Key Features:

• 2-Pole Design: Provides protection for both positive and negative DC lines.
• High Voltage Rating: Rated for DC 1000V, suitable for most solar PV systems.
• Durable Construction: Made with high-quality insulating materials, flame-retardant, and UV-resistant housing for long-term outdoor durability.
• Secure Connections: Screw-type terminals ensure stable and reliable electrical connections.
• Visual Indicators: Features clear indicator windows to show the ON (red) or OFF (green) status.

Figure 2: Indicator windows. Red indicates the breaker is ON (closed), and green indicates the breaker is OFF (open).

4. Specifications

5. Setup and Installation

Proper installation is crucial for the safe and effective operation of the circuit breaker. Ensure all power is disconnected before proceeding.

5.1 Din Rail Mounting

1. Ensure the Din Rail is securely mounted within an appropriate enclosure.
2. Align the circuit breaker's mounting clip with the Din Rail.
3. Press the circuit breaker firmly onto the Din Rail until it clicks into place.
4. Verify that the circuit breaker is securely fastened and does not wobble.

Figure 3: The TOB7Z-63 circuit breaker securely mounted on a standard 35mm Din Rail.

5.2 Wiring Connections

1. Identify the input (source) and output (load) terminals. The terminals are typically marked or indicated by diagrams on the device.
2. Connect the DC positive (+) lead from your solar array or source to the designated positive input terminal.
3. Connect the DC negative (-) lead from your solar array or source to the designated negative input terminal.
4. Connect the DC positive (+) lead to your inverter, charge controller, or battery bank from the designated positive output terminal.
5. Connect the DC negative (-) lead to your inverter, charge controller, or battery bank from the designated negative output terminal.
6. Ensure all wire connections are tight and secure using a suitable screwdriver. Recommended torque specifications should be followed if provided on the device or packaging.
7. Verify correct polarity for all connections to prevent damage to your PV system components.

Figure 4: Bottom view showing the screw-type terminals for secure wiring connections.

6. Operating Instructions

6.1 Turning the Circuit Breaker ON/OFF

• To Turn ON: Push the operating handle upwards. The indicator window should display RED, signifying that the circuit is closed and power is flowing.
• To Turn OFF: Pull the operating handle downwards. The indicator window should display GREEN, signifying that the circuit is open and power flow is interrupted.

6.2 Automatic Tripping

In the event of an overcurrent or short circuit, the circuit breaker will automatically trip to the OFF position, protecting your system. The handle will move downwards, and the indicator window will show GREEN.

Before resetting a tripped breaker, investigate and resolve the cause of the trip. Do not repeatedly reset a breaker without addressing the underlying issue.

7. Maintenance

The TOMZN TOB7Z-63 circuit breaker is designed for minimal maintenance. However, periodic checks are recommended:

• Visual Inspection: Regularly inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections.
• Cleanliness: Keep the circuit breaker free from dust, dirt, and moisture. Use a dry, soft cloth for cleaning.
• Connection Checks: Periodically check terminal screws to ensure they remain tight.
• Do Not Disassemble: Do not attempt to open or repair the circuit breaker. Internal repairs should only be performed by the manufacturer or authorized service personnel.

8. Troubleshooting

If you encounter issues with your circuit breaker, refer to the following common troubleshooting steps:

• Breaker Trips Frequently:
  • Overload: The connected load may exceed the breaker's rated current. Reduce the load or ensure the breaker rating is appropriate for the circuit.
  • Short Circuit: A direct connection between positive and negative conductors. Inspect wiring for damage, frayed insulation, or incorrect connections.
  • Ground Fault: Current leaking to ground. Check for insulation breakdown in wiring or equipment.
• Breaker Does Not Reset:
  • A persistent fault (overload or short circuit) may still be present. Resolve the fault before attempting to reset.
  • If no fault is present and the breaker still won't reset, it may be damaged and require replacement.
• No Power to Load When Breaker is ON:
  • Check all wiring connections for looseness or incorrect installation.
  • Verify that the power source (e.g., solar panels) is producing voltage.
  • Test the breaker for continuity if you suspect internal failure (only by qualified personnel).

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt or proof of purchase for warranty claims.