Tomzn 2P DC 1000V Solar Mini Circuit Breaker

The Tomzn 2P DC 1000V Solar Mini Circuit Breaker is a double-pole DC MCB available in 16A, 20A, 32A and 63A options. It is intended for compatible photovoltaic circuits where the actual product voltage, current, polarity and breaking-capacity markings match the system design. Select the required current rating before ordering.

DC-rated protection for compatible solar circuits

Direct-current switching requires equipment specifically rated for DC service. A DC arc behaves differently from an AC arc, making voltage rating, pole connection and polarity especially important. This product is listed for applications up to 1000V DC, but the electrician must verify the marking on the supplied unit and follow its wiring diagram before installation.

The 2P configuration allows two conductors to be switched together when wired according to the manufacturer’s diagram. Whether both poles are used in series, or used for positive and negative conductors, depends on the exact breaker design and the solar system. Never guess the connection method from appearance alone.

Select the Tomzn 2P DC 1000V Solar Mini Circuit Breaker only after confirming maximum DC voltage, current and conductor protection requirements.

Listed product specifications

• Brand: TOMZN
• Type: Photovoltaic DC miniature circuit breaker
• Configuration: 2P double pole
• Current options: 16A, 20A, 32A and 63A
• Listed maximum voltage: Up to 1000V DC
• Listed breaking capacity: 6kA
• Listed trip curve: C type
• Mounting: 35mm DIN rail

Product revisions can differ. Confirm the voltage, current, breaking capacity, terminal direction, polarity symbols and standards printed on the physical unit. The system designer should also check the inverter or charge-controller manufacturer’s requirements.

Tomzn 2P DC 1000V Solar Mini Circuit Breaker rating selection

The correct current rating depends on the expected operating current, conductor capacity, photovoltaic string configuration, equipment limits, ambient temperature and applicable design factors. A larger breaker is not automatically safer because an oversized device may fail to provide the required cable protection.

• 16A: may suit compatible lower-current PV or DC circuits after calculation.
• 20A: may suit a circuit whose conductors and connected equipment support 20A protection.
• 32A: may suit higher-current DC feeders designed for this rating.
• 63A: may suit compatible DC distribution or equipment circuits using adequately sized conductors.

These examples are general orientation only. A qualified solar professional must select the final rating based on the actual installation.

Possible solar and DC applications

The Tomzn 2P DC 1000V Solar Mini Circuit Breaker may be considered for photovoltaic string circuits, solar combiner or distribution boxes, and suitable DC feeds serving an inverter or charge controller. Battery circuits require special attention because their available fault current can be extremely high; suitability must be confirmed rather than assumed.

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

Important installation and safety checks

Installation must be performed by a qualified electrician or solar technician experienced with high-voltage DC systems. Isolate every source, including photovoltaic arrays and batteries, and verify the circuit is de-energized before touching conductors. Solar panels can produce hazardous voltage whenever exposed to light.

• Follow the polarity and line/load direction marked on the actual breaker.
• Confirm that the system’s maximum open-circuit voltage remains within the breaker’s rating.
• Account for cold-weather PV voltage rise and applicable design margins.
• Use correctly sized DC-rated cable, connectors, lugs, busbars and enclosures.
• Tighten terminals to the specified torque and check for heating after commissioning.
• Use separate surge, earth-fault or isolation equipment where the design requires it.

Do not repeatedly reset a tripped breaker without finding the cause. A short circuit, reversed polarity, damaged cable or overloaded circuit requires professional investigation.

Order the correct solar MCB

Select the Tomzn 2P DC 1000V Solar Mini Circuit Breaker in 16A, 20A, 32A or 63A before checkout and compare the product label with your system schedule. If you are unsure about string voltage, operating current, fault current or wiring direction, share the system details with HN Electric before purchasing. Correct selection and professional installation are essential for reliable DC protection.