TOMZN TOB7Z-63 DC Mini Circuit Breaker User Manual

1. Safety Information

Warning: To avoid danger of suffocation, keep this bag away from babies and children. Do not use this bag in cribs, beds, carriages, or play pens. This bag is not a toy.

• Always ensure power is disconnected before installation, maintenance, or troubleshooting.
• Installation and operation should only be performed by a qualified electrical professional.
• Do not place the device near flammable materials.
• Ensure adequate ventilation during operation.
• Disconnect from power and store properly when not in use for extended periods.
• This device handles high voltage (above 50Vac or 75Vdc). Exercise extreme caution.

2. Product Overview

The TOMZN TOB7Z-63 DC Mini Circuit Breaker is designed for DC rated voltage up to 1000V and rated current up to 63A. It provides essential overload and short circuit protection for DC circuits, commonly used in communications and photovoltaic (PV) systems. This circuit breaker complies with IEC60947-2 standards.

Key Features:

• Fast-response protection
• Overload protection
• Short-circuit protection
• Suitable for solar systems
• DIN Rail mountable
• Constructed with flame retardant material

Figure 1: Front view of the TOB7Z-63 DC Mini Circuit Breaker.

Figure 2: Product appearance display highlighting terminals, PC flame retardant material, model number, rated current, breaking capacity (DC 1000V), wiring diagram, operating handle, and fastening screws.

3. Setup and Installation

1. Upon receiving the product, ensure that a qualified electrical professional performs the installation and initial operation.
2. Connect the equipment strictly in accordance with the provided wiring diagram specifications.
3. Adjust any necessary equipment parameters as instructed.

Wiring Diagram:

Figure 3: Easy wiring diagram. When power is input through the + and - terminals, please screw down to penetrate the insulating layer of the power lines. Ensure correct polarity for positive input, negative input, positive output, negative output, and ground wire connections.

Mounting:

The TOB7Z-63 is designed for DIN rail mounting (35mm). Use the fast clip device for secure attachment. Terminals are designed for top and bottom connections.

Figure 4: Circuit breaker shown mounted on a DIN rail.

4. Operating Instructions

The circuit breaker operates automatically. When the electrical load in the circuit exceeds its rated capacity, the device will automatically trip and cut off the circuit to prevent damage.

Visual Indicators:

The TOB7Z-63 features indicator windows for clear status display:

• **Green Indicator Window:** Indicates the circuit is closed (OFF).
• **Red Indicator Window:** Indicates the circuit is on (ON).

Figure 5: Visible security indicators showing green for closed (OFF) and red for on (ON).

5. Maintenance

• Regularly inspect the circuit breaker for any signs of physical damage, overheating, or loose connections.
• Ensure the area around the circuit breaker is clean and free from dust and debris to maintain proper ventilation.
• Periodically check the tightness of terminal screws to ensure secure electrical connections.
• Do not attempt to repair the circuit breaker yourself. If a fault is suspected, replace the unit with a new one.

6. Troubleshooting

Circuit Breaker Trips Frequently:

• Cause: Overload or short circuit in the connected system.
• Solution: Identify and resolve the cause of the overload or short circuit. Check the total current draw of connected devices and ensure it does not exceed the circuit breaker's rated current. Inspect wiring for any shorts.

Circuit Breaker Does Not Reset:

• Cause: Persistent fault (overload/short circuit) or internal damage to the breaker.
• Solution: Ensure the fault has been cleared. If the breaker still does not reset, it may be damaged and require replacement.

Incorrect Polarity Indication:

• Cause: Incorrect wiring during installation.
• Solution: Refer to the wiring diagram (Figure 3) and ensure all positive (+) and negative (-) connections are correctly made. Incorrect polarity can lead to improper operation or damage.

7. Specifications

Figure 6: Detailed specifications for the TOB7Z-63 DC MCB.

Dimensions:

Figure 7: Dimension diagram showing height, length, and width in millimeters and inches. (A: 83mm/3.27in, B: 36mm/1.42in, C: 35mm/1.38in, D: 65mm/2.56in, E: 50mm/1.97in, F: 83mm/3.27in).

8. User Tips

• Polarity is Crucial: Always double-check the polarity (+ and -) when wiring. The diagram indicates the current sense, and incorrect wiring can be dangerous or prevent proper function.
• Choose Correct Amperage: Select the circuit breaker's rated current (e.g., 20A, 63A) based on the specific load and controller (e.g., MPPT controller) it will protect. For a 50A MPPT controller, a 63A breaker might be appropriate.
• DC for DC, AC for AC: Never use an AC circuit breaker for DC circuits. DC current is much stronger and can cause an AC breaker to burn out due to arc formation. Always use a DC circuit breaker for DC applications.
• Professional Installation: Given the high voltage and electrical nature, professional installation is highly recommended to ensure safety and correct operation.

9. Warranty and Support

For detailed warranty information and technical support, please refer to the official user manual PDF provided by TOMZN. You can access the PDF manual here.

For further assistance, please contact TOMZN customer support through their official channels.

10. Product Video