Tomzn 2P DC Circuit Breaker 100A / 125A

The Tomzn 2P DC Circuit Breaker is available in 100A and 125A options for suitably designed direct-current circuits. Its double-pole format allows two conductors to be switched together, making it a practical protective and isolation component for compatible solar, battery and DC distribution installations. The correct rating must be selected from the available option before ordering.

High-current protection for compatible DC systems

DC systems require equipment specifically rated for direct current. Unlike AC, a DC arc does not naturally pass through a zero point on every cycle, so voltage rating, polarity, wiring direction and interrupting capacity are especially important. This breaker should only be used within the electrical ratings printed on the actual product label and supported by the installation design.

The product listing offers 100A and 125A current choices. These ratings do not mean either option is automatically suitable for every battery bank, inverter or solar installation. Cable size, conductor insulation, ambient temperature, enclosure conditions, expected fault current and the ratings of connected equipment must all be checked by a qualified professional.

Select the Tomzn 2P DC Circuit Breaker only after confirming the required continuous current, DC voltage and interrupting capacity.

Product details

• Brand: TOMZN
• Product type: DC circuit breaker / MCB
• Number of poles: 2P double pole
• Current options: 100A or 125A
• Application: Compatible DC protection and isolation circuits
• Mounting: DIN-rail panel installation

Always confirm the voltage marking, breaking capacity, terminal diagram and any polarity symbols on the supplied unit before installation. Product photographs and label details should be compared with your system requirements, particularly when the breaker will be used in a higher-voltage DC arrangement.

Possible applications

The Tomzn 2P DC Circuit Breaker may be considered for battery outputs, inverter-side DC circuits, DC distribution boards and other compatible renewable-energy installations. Whether it is appropriate depends on the exact circuit location and the manufacturer requirements of the inverter, battery, charge controller or other connected equipment.

• Battery-bank output circuits designed for the selected current rating
• DC feeds serving compatible inverter or power-conversion equipment
• DC distribution panels and purpose-built protection enclosures
• Solar or backup-power systems where the actual breaker ratings match the design

Browse more circuit breakers and solar accessories, or compare other TOMZN products available from HN Electric.

Tomzn 2P DC Circuit Breaker sizing checks

Choose between 100A and 125A only after calculating the normal operating current and the required protection for the conductors. A breaker that is oversized for the cable may fail to provide the intended conductor protection. A breaker that is undersized may trip during normal operation. The system designer should also account for continuous load, temperature derating and the recommendations of connected equipment manufacturers.

Do not assume that a DC breaker provides surge protection, reverse-polarity protection, battery management or ground-fault protection. Where those functions are required, suitable separate equipment must be included in the design.

Professional installation required

Installation and testing should be completed by a qualified electrician or solar technician familiar with DC systems. Isolate every power source, including batteries and photovoltaic inputs, and verify that the conductors are de-energized before work begins. Batteries and solar arrays can remain hazardous even when other equipment appears switched off.

• Follow the line/load direction and polarity markings on the actual breaker.
• Use correctly sized DC-rated cables, lugs, busbars and enclosures.
• Tighten terminals to the specified torque and recheck them after commissioning.
• Provide appropriate upstream and downstream protection for the complete system.
• Keep live DC parts enclosed and label the isolation points clearly.
• Never operate or install a breaker that shows heat damage, cracks or loose terminals.

Order the correct TOMZN DC breaker

Before checkout, select the required 100A or 125A Tomzn 2P DC Circuit Breaker option and compare the displayed product label with your design. If you are uncertain about voltage, current, breaking capacity or wiring direction, send HN Electric your system details before purchase. Correct selection and professional installation are essential for dependable DC protection.