TOMZN 2P DC Circuit Breaker 10A- 12V-1000V Wide RangeDC MCB for PV System (TOMZN TOB7Z-63)

The TOMZN TOB7Z-63 DC Circuit Breaker is a 2P DC miniature circuit breaker, also called a DC MCB, for solar photovoltaic (PV) systems. It is designed for DC applications up to 1000V and suits Bangladeshi homeowners, businesses and installers who want DC overload and short-circuit protection on the array side of a solar installation.

• Overview
• Key features
• Specifications
• How to use and set up
• Compatibility and what is in the box
• Who should buy it in Bangladesh
• Alternatives in our store
• Warranty and support
• Delivery, returns and ordering
• Frequently asked questions

TOMZN TOB7Z-63 DC Circuit Breaker overview

The listing presents the TOMZN TOB7Z-63 DC Circuit Breaker as a 2P DC 1000V solar mini circuit breaker from the TOB7Z-63 series. According to the listing, it is designed for direct current applications in solar installations, where it guards solar panels, inverters and associated wiring against overloads and short circuits. The maker lists it for residential rooftop systems, commercial and industrial PV projects, off-grid battery systems, and solar street lights or water pumping.

The listing says the device is often used as the primary protective device for individual PV strings in a DC combiner box. For grid-tied systems, it says the breaker sits before the inverter interface. Decide where the TOMZN TOB7Z-63 DC Circuit Breaker will sit in your single-line plan before anything else, because that location determines which cables it protects.

Bangladeshi buyers often ask how a TOMZN TOB7Z-63 DC Circuit Breaker copes with humidity, heat and power interruptions. The listing mentions robust construction and flame-retardant materials, but it does not state operating limits for humidity or temperature. Load-shedding changes when your system charges and discharges, but a breaker protects against faults; it does not replace a properly sized battery or backup plan.

Good site planning starts before any protective device is ordered. Sketch the string layout, note the maximum DC voltage and current your design expects, and identify where the DC combiner box or distribution board will sit. Keep that location dry, shaded and reachable for maintenance, and leave room for cable bends.

Dhaka’s monsoon humidity and summer heat are demanding conditions for any electrical enclosure. A closed, well-ventilated box, kept clear of standing water and direct runoff, is a practical starting point. Your installer can judge which enclosure suits the site, because the listing itself does not describe one.

Key features

High DC voltage rating (1000V)

The listing describes the TOMZN TOB7Z-63 DC Circuit Breaker as designed for the high DC voltages common in modern solar PV arrays. It carries a 1000V rating, and the product name gives a 12V–1000V wide range. When you plan the system, check that the array voltage stays within that rating. The listing says this supports safe and effective operation and gives no further detail beyond the rated voltage.

Dual pole protection (2P)

The TOMZN TOB7Z-63 DC Circuit Breaker is a two-pole (2P) unit. According to the listing, it disconnects both the positive and negative DC lines at the same time when a fault occurs, which the maker says enhances system safety. For a solar string, one device covers both conductors rather than a single line. Ask your installer to confirm the DC wiring plan so the breaker sits where your design expects it.

Multiple current options (10A, 20A and 32A)

The listing names 10A, 20A and 32A ratings, which lets you match the TOMZN TOB7Z-63 DC Circuit Breaker to the string current in your PV design. The TOB7Z-63 series is also described as supporting up to 63A for larger configurations. The product name refers to the 10A version, while the feature list names all three options, so match the rating to your design calculations rather than the title alone.

Overload and short-circuit protection

The listing says the TOMZN TOB7Z-63 DC Circuit Breaker uses a thermal-magnetic tripping mechanism to protect against sustained overcurrents, which the maker links to preventing overheating and potential damage. It also has a rapid magnetic trip unit that disconnects the circuit quickly in a short circuit, which the listing says minimises arc flash risks and equipment damage. The listing presents this as two layers of protection in one device.

High breaking capacity (6kA)

According to the listing, the TOMZN TOB7Z-63 DC Circuit Breaker can safely interrupt high fault currents up to 6000 amps, which the maker describes as superior protection under severe fault conditions. The listing gives this figure without detail on the conditions behind it, so treat 6kA as the listed value and keep it on the specification sheet for your records. Your installer can explain how the figure fits your site.

DIN rail mounting and durable construction

The TOMZN TOB7Z-63 DC Circuit Breaker is designed for a standard 35mm DIN rail, which the listing says makes it compatible with most electrical distribution boards and enclosures. The listing also describes high-quality, flame-retardant materials for longevity, reliability and safety in various environmental conditions. The listing names clear ON/OFF indication for quick status checks.

Specifications

Specifications for the TOMZN TOB7Z-63 DC Circuit Breaker are taken from the product listing, and the table shows each value as the maker lists it.

These are listed specifications from the product listing.

Read the table as a checklist. Voltage, current ratings, poles and mounting go into your design sheet, while the standard and breaking capacity go into your records. Where a value is not in the listing, mark it as not confirmed rather than filling the gap from memory.

How to use and set up

Installing the TOMZN TOB7Z-63 DC Circuit Breaker is a job for a qualified electrician or solar technician who knows DC systems. The listing says so directly, and it is the sensible starting point for any PV work.

Before any electrical work, disconnect all power sources to the solar system, including both the AC and DC sides, as the listing advises. Use suitable personal protective equipment and work methodically.

Mount the breaker securely on a 35mm DIN rail inside a suitable enclosure, such as a DC combiner box or distribution board, that gives adequate protection from the environment. Follow the maker’s instructions for fixing the unit.

When you wire the TOMZN TOB7Z-63 DC Circuit Breaker, follow the listing’s order of connections. It says to connect the incoming DC positive and negative cables from the array or combiner box to the top terminals of the 2P breaker, and the outgoing DC positive and negative cables to the inverter or charge controller at the bottom terminals. It asks for correct polarity and tight connections, with torque to specifications, typically 2.5 Nm.

Use DC-rated cables of an appropriate gauge for your current and voltage, which the listing says helps prevent overheating and voltage drop. Cable choice is part of the same design check as the breaker rating.

After installation, perform continuity and insulation resistance tests before you re-energise the system, as the listing recommends.

The listing says the MCB is designed for manual operation. ON means the circuit is closed and power flows; OFF means the circuit is open and power is interrupted. If an overload or short circuit occurs, the breaker trips automatically to OFF. Once the TOMZN TOB7Z-63 DC Circuit Breaker is installed and tested, use the manual switch only after the system has been checked.

Store the TOMZN TOB7Z-63 DC Circuit Breaker in a dry, clean place until installation day, away from direct sun and dust. Leave it somewhere stable where it will not be knocked or stacked under heavy items.

For day-to-day care, keep the enclosure closed, keep the breaker clean and dry, and ask your installer to check terminal tightness at routine inspections. A simple periodic check by a technician can also look at the condition of the enclosure and any signs of overheating around the connections. If the TOMZN TOB7Z-63 DC Circuit Breaker trips repeatedly, do not force it back on; ask a qualified technician to find the cause.

Keep a project folder for the TOMZN TOB7Z-63 DC Circuit Breaker. Record the model number, the current rating you chose, the cable sizes, the enclosure location and the date of your continuity and insulation tests. A written record makes later checks faster and gives your installer a clear reference.

A simple planning checklist helps before installation day. Confirm the array voltage, the current rating for each string, the cable gauge, the enclosure size and the DIN rail space for your TOMZN TOB7Z-63 DC Circuit Breaker. Write these figures down and share them with your installer, so the job runs from one plan rather than from memory.

Compatibility and what is in the box

The listing describes the TOMZN TOB7Z-63 DC Circuit Breaker for DC solar PV systems up to 1000V. It names DC combiner boxes, inverters and charge controllers as places where it is used, and it fits a standard 35mm DIN rail in a suitable distribution board or enclosure. Brand-level compatibility with specific inverters, panels or batteries is not confirmed by the listing.

The listing does not describe the package contents for the TOMZN TOB7Z-63 DC Circuit Breaker, so this page does not list them. Check what arrives with your order against the product page and your own design before installation.

The listing title refers to 10A, while the features name 10A, 20A and 32A and the series supports up to 63A. Confirm the current rating for your string or circuit against your design, not the title alone.

The listing says the product meets international standards such as IEC/EN 60947-2, and it states suitability for the Bangladesh market. Ask your installer how the standard reference fits the documents your project needs.

The listing does not name specific cable types or lug sizes. It asks for DC-rated cables of an appropriate gauge for your current and voltage, so take the cable choice from your design rather than from the breaker page.

Compare the breaker’s listed voltage and current limits with the datasheet of each inverter, charge controller and combiner box in your design. Where a figure is missing from the listing, rely on the manufacturer’s documentation for that component and record the source.

For background on a different type of home device, see the background on smart plugs. A smart plug is not a DC breaker, so use that page for context only.

Who should buy it in Bangladesh

The TOMZN TOB7Z-63 DC Circuit Breaker suits buyers who are building or extending DC solar protection and have an installer on the job. Here are realistic scenarios where the listing’s use cases apply.

Homeowners with a rooftop system: if you are adding DC protection to a rooftop array, the listing names residential rooftop systems as a use for the TOMZN TOB7Z-63 DC Circuit Breaker. Ask your electrician to plan the DC side around it, including the enclosure and cable runs.

Commercial or industrial buyers: the listing mentions commercial and industrial PV projects on factories, offices and warehouses. Larger arrays may use the 32A or series options, depending on the design and the current each string carries.

Off-grid households and businesses: the listing names battery-based off-grid systems as a critical use. Load-shedding can change how often a system runs, so plan battery capacity separately from the breaker.

Street light and pumping projects: the listing names solar street lights and water pumping systems as ideal for standalone DC applications. A standalone DC circuit needs its own protection plan, and the breaker should be checked against that circuit’s maximum voltage and current.

Upgrading an existing plant: if your system already runs without a dedicated DC breaker, the listing says the device suits DC combiner boxes as the primary protection for individual strings. Upgrading a plant with the TOMZN TOB7Z-63 DC Circuit Breaker is a job for a technician who can check the existing wiring first.

Installers and technicians buying for client jobs: a TOMZN TOB7Z-63 DC Circuit Breaker can be specified for several projects, but each job needs its own voltage and current check. Keep a record of the rating used on each site so that future service visits are straightforward.

Buyers still unsure of their design: do not guess the current rating. Ask your installer, or contact us with your design figures, before you order. The listing asks for installation by a qualified electrician or solar technician, so plan for that help before you buy.

Alternatives in our store

If the TOMZN TOB7Z-63 DC Circuit Breaker is not the right fit for your design, browse these options. Each link goes to a product page in our range.

SONOFF WiFi Smart Wall Touch Switch T3 UK 3 Gang- Compatible With Alexa, Google Assistant – Black Color is another smart switch in our Smart Switches & Electrical range.

LDNIO Z4 Universal Plug 6A Max (ABS V0) is another electrical accessory in our range.

Deli CT705ES 3 Pin 6 Port 3 Meter Power Strip With Surge Protection is a power strip in our range.

TOMZN TOB7Z-63 2P DC Circuit Breaker – 10A, 20A, 32A Solar PV MCB, 12V–1000V Wide Range DC MCB for PV System is a related TOB7Z-63 listing in our range, so compare its listing details with this TOMZN TOB7Z-63 DC Circuit Breaker page before you choose.

Browse the whole Smart Switches & Electrical category for more options.

Warranty and support

Warranty: 7 Days seller warranty.

Delivery, returns and ordering

We deliver all over Bangladesh and you pay cash on delivery.

Delivery usually takes 1–3 days inside Dhaka city and 2–5 days outside Dhaka.

You can return it within 7 days of delivery (see our Delivery & Returns policy).

Questions before ordering: call 09638054751, message us on Facebook Messenger or email care@gadgetsuperb.com.

Before you order the TOMZN TOB7Z-63 DC Circuit Breaker, confirm the model, the current rating and the quantity you need, then call or message us. Checking these three details first helps you avoid a return within the 7-day window.

When you contact us, include the model number and the current rating you need, so the answer matches your design. The full terms are on our policy page.

Frequently asked questions

What is the TOMZN TOB7Z-63 DC Circuit Breaker used for?

The breaker is a 2P DC unit for solar PV systems. According to the listing, it protects panels, inverters and wiring against overloads and short circuits.

Is the TOMZN TOB7Z-63 DC Circuit Breaker rated for 1000V DC?

Yes, the listing gives a 1000V DC rating for the TOMZN TOB7Z-63 DC Circuit Breaker and a 12V–1000V wide range in the product name.

Which current ratings does this breaker come in?

The listing names 10A, 20A and 32A options. It also says the TOB7Z-63 series supports up to 63A for larger configurations.

Does this breaker fit a DIN rail?

Yes, the listing says it is designed for a standard 35mm DIN rail inside a suitable enclosure.

Is there a wiring diagram for this breaker?

The listing describes the wiring order, with incoming cables to the top terminals and outgoing cables to the bottom terminals, but it does not include a wiring diagram. Follow the maker’s instructions and a qualified electrician’s guidance.

What standard does the TOMZN TOB7Z-63 DC Circuit Breaker meet?

The listing says it meets international standards such as IEC/EN 60947-2.

What warranty comes with this breaker?

Warranty: 7 Days seller warranty.

Can I return this breaker after delivery?

Yes, you can return it within 7 days of delivery, as set out in our Delivery & Returns policy.

How do I order the TOMZN TOB7Z-63 DC Circuit Breaker in Bangladesh?

We deliver all over Bangladesh and you pay cash on delivery. Call 09638054751, message us on Facebook Messenger or email care@gadgetsuperb.com with questions before ordering.

Can this breaker protect a solar street light circuit?

The listing names solar street lights and water pumping systems as ideal for standalone DC applications that need robust circuit protection. Check that circuit’s maximum voltage and current before you choose a rating.

What should I check before installing a DC breaker?

Check the array voltage, the current rating, the cable sizing and the enclosure against your design, then have a qualified electrician or solar technician install it.