TOMZN TOB7Z-63 2P DC Circuit Breaker – 10A, 20A, 32A Solar PV MCB, 12V–1000V Wide Range DC MCB for PV System

The TOMZN TOB7Z-63 DC Circuit Breaker is a 2P DC circuit breaker for solar PV systems, listed as rated from 12V to 1000V DC. It is aimed at homeowners, off-grid builders and installers who want protection between solar panels, batteries and inverters. Choose a 10A, 20A or 32A rating to suit your array.

• 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

What Is the TOMZN TOB7Z-63 DC Circuit Breaker?

According to the listing, the TOMZN TOB7Z-63 DC Circuit Breaker is specifically engineered for DC applications. The listing says that standard AC breakers can fail under DC arcs, and it presents this product as having a dedicated non-polarized design and rapid arc-extinguishing technology, which the listing says is designed to prevent fires and equipment damage. The listing calls the TOMZN TOB7Z-63 DC Circuit Breaker the ultimate line of defense for your PV system, which is the maker’s own wording rather than an independent review.

The maker lists a rated voltage range of 12V DC up to 1000V DC. That spread is what makes the TOMZN TOB7Z-63 DC Circuit Breaker relevant to very different builds, from a small off-grid cabin with a 12V or 24V battery bank to a larger solar array with high-voltage strings. The listing also names LiFePO4 batteries and hybrid inverters as equipment it helps protect from overcurrent spikes, so the breaker is relevant on both the panel side and the battery side of a system.

Who is it for? Homeowners with a solar home system, owners of RV, marine or off-grid power setups, and installers who build DC distribution boxes will find the most direct use for the TOMZN TOB7Z-63 DC Circuit Breaker. In Bangladesh, many households rely on batteries and inverters during load-shedding, and a protective device on the DC side is one part of keeping that equipment safe. It is not a substitute for a correctly designed system, so check the rating against your own panel and battery specifications before you order, and have a qualified person review the design where you are unsure.

Key features

Wide voltage range

The listing says the TOMZN TOB7Z-63 is rated for operation from 12V DC up to 1000V DC, which the maker presents as compatibility with various solar string configurations. The listing also describes one model covering 12V, 24V and 48V battery systems as well as high-voltage PV strings of 600V and above. For a Bangladeshi home system, that gives you room to plan for an array that may change in size, provided the array and battery voltages both sit inside the listed range. The listing does not give any tolerance beyond the stated range, so treat that range as the limit for the TOMZN TOB7Z-63 DC Circuit Breaker.

Non-polarized wiring

According to the listing, the non-polarized design simplifies installation because the breaker works effectively regardless of which side the positive and negative wires are connected to. That matters for a first-time installer, and for a technician working in a crowded distribution box where space is tight. The listing still describes a connection layout in its How It Works section, with the positive and negative wires from the panels going to the top terminals. Follow the maker’s instructions for the TOMZN TOB7Z-63 DC Circuit Breaker, and do not treat a non-polarized design as a reason to skip the wiring check.

Breaking capacity of 6kA

The maker lists a breaking capacity of 6kA, which the listing describes as robust protection against high-current surges and short circuits. Keep this figure with the rated current in your system notes, so the protection details are recorded together. The listing does not give further detail on how the 6kA figure was established, so ask us if you need that for a formal design. Pair the 6kA figure with the 10A, 20A or 32A rating you select for the TOMZN TOB7Z-63 DC Circuit Breaker, rather than choosing on the current rating alone.

Rapid response

According to the listing, the TOMZN TOB7Z-63 DC Circuit Breaker uses a thermal-magnetic trip mechanism that acts instantly to isolate faults. The maker says this protects sensitive inverters and charge controllers. The How It Works section adds that, if a short circuit occurs, the breaker will automatically trip to the OFF position. After any trip, look for the cause before you move the lever back to ON, and treat the trip as a prompt to investigate rather than a fault to reset repeatedly. Ask a qualified electrician to help if the trip happens again.

35mm DIN rail mounting

The listing describes a standard 35mm DIN rail mount, designed for installation inside standard distribution boxes. For the TOMZN TOB7Z-63 DC Circuit Breaker, the listing says the mounting is a clip onto the rail inside the box. Measure the enclosure and the rail first, and plan the layout so that the lever can move freely and the cable entries are easy to reach. Keep the cable routing tidy, because a neat box is easier to inspect and maintain later.

Durable construction

The listing says the breaker is built with flame-retardant materials and high-conductivity copper components for long-term outdoor cabinet use. These are the maker’s descriptions, and the listing does not give a test report or standard reference for them. Bangladesh’s heat and humidity are demanding on any electrical enclosure, so install the TOMZN TOB7Z-63 DC Circuit Breaker in a suitable cabinet and check the listed operating temperature of -25°C to +70°C before you decide where it goes. Keep the cabinet closed and protect the cable entries from dust and insects.

Specifications

The table below sets out the specifications given for the TOMZN TOB7Z-63 DC Circuit Breaker in the product listing. Use these values as the reference point for your own design, and check them against your panel and battery data.

These are listed specifications from the product listing.

How to use and set up

Setup for the TOMZN TOB7Z-63 DC Circuit Breaker follows five steps, as the listing sets them out. The steps below are general. Follow the maker’s instructions and the wiring rules that apply to your installation, and ask a qualified electrician to check the work if you are not sure. Isolate the system before you start any work on it.

• Selection: The listing says to choose the amperage rating of 10A, 20A or 32A that is roughly 1.25x to 1.5x your solar panel’s short-circuit current (Isc). Find that figure on your panel datasheet, apply the listed range to it, and see which rating falls inside the result. If your figure sits between two ratings, consider the array and the wiring as a whole before you decide.
• Mounting: Clip the TOMZN TOB7Z-63 DC Circuit Breaker onto a 35mm DIN rail inside a distribution box, as the listing describes. Position it so that the lever and the terminals are easy to reach, and leave room for the cables to bend without strain. Keep the box closed once the work is finished.
• Wiring: Connect the positive (+) and negative (-) wires from the solar panels to the top terminals, and the output to the charge controller or inverter to the bottom terminals. The listing describes this layout in words, so compare it with your own system drawing before you energise anything. Tighten each connection firmly, and check that no loose strands stick out of the terminal.
• Testing: Flip the switch to ON. The listing says that if a short circuit occurs, the TOMZN TOB7Z-63 DC Circuit Breaker will automatically trip to the OFF position. Treat this as the listing’s description of the behaviour, and do not rely on it as a substitute for your installer’s own checks.
• Isolation: Use the lever to manually cut off power whenever you need to work on the system safely. The listing describes the TOMZN TOB7Z-63 DC Circuit Breaker as a convenient DC isolator for maintenance or cleaning of the solar array, which is useful when you clean panels during the dry season.

Bangladeshi rooftops and balconies can be dusty and humid, so plan the box position and cable routing with those conditions in mind. Keep the enclosure sheltered from rain and direct splashes, and keep the layout simple enough that you can inspect it without disturbing the wiring.

Compatibility and what is in the box

The listing confirms several compatibility points for the TOMZN TOB7Z-63 DC Circuit Breaker. It is rated for DC 12V to 1000V, has a 2P (double pole) configuration, and is listed for installation on a 35mm DIN rail. It names LiFePO4 batteries, hybrid inverters, charge controllers and inverters as equipment it protects, and it lists use with 12V/24V/48V battery systems and high-voltage 600V+ PV strings.

Some points are not confirmed by the listing. It does not name specific inverter or charge controller brands, so we cannot say the TOMZN TOB7Z-63 DC Circuit Breaker is matched to any particular model. It also does not state the physical enclosure size or the cable sizes it accepts. Compare the listed rating with your panel and battery figures, and check the cable and enclosure fit against your own plan.

A simple check is to list your panel short-circuit current, battery voltage, inverter input voltage and cable route. Compare that list with the ratings on this page, and mark any item the listing does not cover so that you can ask us about it.

The listing does not describe the package contents, so this page does not list them. If the contents matter for your installation, ask us for the details.

Who should buy it in Bangladesh

The listing describes several use cases for the TOMZN TOB7Z-63 DC Circuit Breaker. The notes below translate them into realistic buyer scenarios for Bangladesh. They are guidance rather than extra claims from the maker.

• Solar home systems: a household with rooftop panels, a battery bank and a hybrid inverter can use the TOMZN TOB7Z-63 DC Circuit Breaker on the connection between the array and the inverter, which the listing names as one of its uses.
• Off-grid cabins and small rural setups: the listing mentions small off-grid cabins and 12V/24V/48V battery systems, so a small battery-based system is the kind of setup the listing describes. Check your battery voltage against the listed range first.
• RV, marine and camper power: the listing describes high-capacity DC protection for battery banks and solar chargers on boats or campers. Boats and campers in humid areas benefit from a closed enclosure and clean terminals.
• Electric vehicle DC circuits: the listing says the breaker can manage lower-power DC charging or auxiliary circuits. Ask a qualified person whether your circuit fits that description.
• Wind turbine systems: the listing says the breaker can safely isolate DC output from wind generators. Owners of small wind systems can use it as a manual isolation point during maintenance.

For a Dhaka flat with limited roof space, a small system may be the realistic starting point. Check the listed voltage and rating against your actual set-up, and remember that the breaker is one part of a larger system.

If your circuit is AC only, the TOMZN TOB7Z-63 DC Circuit Breaker is not the part you need, so check your system drawing first. Installers working on larger DC systems can apply the same rating logic described above, and homeowners should rely on a qualified electrician for the final design.

Alternatives in our store

If the TOMZN TOB7Z-63 DC Circuit Breaker is not the right fit, you may want to look at other products in our range. SONOFF WiFi Smart Wall Touch Switch T3 UK 3 Gang- Compatible With Alexa, Google Assistant – Black Color is another smart wall switch in our range. LDNIO Z4 Universal Plug 6A Max (ABS V0) is another universal plug in our range. Deli CT705ES 3 Pin 6 Port 3 Meter Power Strip With Surge Protection is a power strip in our range. Click Remote Control Switch for Fan & Light is a remote control switch in our range.

You can browse the full category at Smart Switches & Electrical. For background on a related type of device, read the general article on smart plugs, which is separate from this breaker.

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). Read the full terms on that page before you place an order for the TOMZN TOB7Z-63 DC Circuit Breaker.

Because payment is cash on delivery, please keep your contact details up to date so the courier can reach you. The delivery times above are the usual ones, and the policy page sets out the wider terms.

Questions before ordering: call 09638054751, message us on Facebook Messenger or email care@gadgetsuperb.com. We can answer questions about what the listing says, and point you to the policy page for delivery and return details.

Frequently asked questions

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

The TOMZN TOB7Z-63 DC Circuit Breaker is listed as a 2P DC circuit breaker for solar PV systems, protecting the connection between the solar array and the inverter. The listing also names charge controllers and batteries among the equipment it helps protect.

What voltage range does the TOMZN TOB7Z-63 DC Circuit Breaker cover?

The listing gives a rated voltage of DC 12V to 1000V for the TOMZN TOB7Z-63 DC Circuit Breaker. It also describes one model covering 12V, 24V and 48V battery systems as well as PV strings of 600V and above.

Which current ratings does the TOMZN TOB7Z-63 DC Circuit Breaker come in?

The listing gives 10A, 20A and 32A as selectable rated currents. It does not list a 25A option, so choose from those three ratings.

How do I choose between 10A, 20A and 32A on the TOMZN TOB7Z-63 DC Circuit Breaker?

Pick a rating roughly 1.25x to 1.5x your solar panel’s short-circuit current, as the listing describes. Use the figure on your panel datasheet to work it out, and check the result against your system drawing.

Can the positive and negative wires go either way round?

Yes, according to the listing, the non-polarized design works effectively regardless of which side the positive and negative wires are connected to. Even so, follow the maker’s instructions for the terminals.

Is the TOMZN TOB7Z-63 DC Circuit Breaker suitable for a LiFePO4 battery system?

The listing says the breaker is built to protect LiFePO4 batteries and hybrid inverters from damaging overcurrent spikes. Match the rating and voltage to your own battery and inverter specifications.

Can I use the TOMZN TOB7Z-63 DC Circuit Breaker as a DC isolator?

Yes, according to the listing, the lever on the TOMZN TOB7Z-63 DC Circuit Breaker acts as a convenient DC isolator for shutting off the solar array during maintenance or cleaning.

How is the TOMZN TOB7Z-63 DC Circuit Breaker installed?

It is designed for a 35mm DIN rail and clips onto that rail inside a distribution box. Position it so the lever and terminals are easy to reach.

How long is the warranty on the TOMZN TOB7Z-63 DC Circuit Breaker?

The warranty is listed as 7 Days seller warranty.

Can I return the TOMZN TOB7Z-63 DC Circuit Breaker if it does not suit my system?

Yes, you can return it within 7 days of delivery under our Delivery & Returns policy. Read the policy page for the full conditions.

Where can I read the delivery and return terms?

The full terms are on our Delivery & Returns policy page at https://gadgetsuperb.com/delivery-returns/. The main points are summarised in the delivery section above.

How can I ask a question before I order?

Call 09638054751, message us on Facebook Messenger or email care@gadgetsuperb.com. We can answer questions about what the listing says.