TOMZN 2P DC Circuit Breaker 32A- 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 that the listing presents for solar photovoltaic (PV) systems rated up to 1000V DC. It is aimed at Bangladeshi homeowners, installers and small commercial solar owners who want DC-side overload and short-circuit protection for panels, inverters and wiring. Read the listed details below before you order.

• Overview of the TOMZN TOB7Z-63 DC circuit breaker
• Key features
• Specifications
• How to use and set up the breaker
• 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

Overview of the TOMZN TOB7Z-63 DC circuit breaker

According to the listing, the TOMZN 2P DC 1000V Solar Mini Circuit Breaker from the TOB7Z-63 series is designed for direct current applications in solar installations. The listing presents the TOMZN TOB7Z-63 DC circuit breaker as protection against overloads and short circuits, which the maker says helps safeguard solar panels, inverters and associated wiring. The listing presents it for a new solar power plant as well as for upgrading an existing one.

Solar power in Bangladesh is often paired with batteries, inverters and backup arrangements, because grid supply can be interrupted during load-shedding. A DC-side protective device such as this one is one part of that design. The listing does not describe a complete system design, so treat any breaker as one component within a design that a qualified installer has checked. Your installer can show you where a DC-side device sits in the wider layout.

Shoppers often look up this product by its model number, so you will see TOB7Z-63 in the product name and in the specifications. Choose the rating from your array and inverter requirements rather than from the title alone. The listing mentions 10A, 20A and 32A ratings and says the series supports up to 63A for larger configurations, so the right rating depends on your own calculations.

The listing says the TOMZN TOB7Z-63 DC circuit breaker is built for DC applications up to 1000V, which places it in the solar PV range rather than in ordinary household AC wiring. Keep that difference in mind when you compare it with plug-in or wall switch products. It is a protection device for a DC circuit, not a socket, a plug or a light switch.

Key features

The features below are listed for the TOMZN TOB7Z-63 DC circuit breaker, and each one is attributed to the product listing.

High DC voltage rating (1000V)

The listing gives a high DC voltage rating of 1000V and says the breaker is designed to handle the high DC voltages that the maker associates with modern solar PV arrays. For Bangladeshi installers, the practical step is to compare the rating of the TOMZN TOB7Z-63 DC circuit breaker with the maximum voltage your planned array can produce. A qualified installer can calculate that figure from the panel specifications and the string layout. The listing does not go beyond 1000V, so do not assume extra margin without checking with the maker or your installer.

Dual pole protection (2P)

According to the listing, the 2P design disconnects both the positive and negative DC lines at the same time when a fault occurs, which the maker says enhances system safety. The TOMZN TOB7Z-63 DC circuit breaker is a two-pole unit, so one device covers both DC conductors of a circuit. Ask your installer to confirm where a 2P device belongs in your layout, because the listing does not include a design drawing.

Multiple current ratings

The TOMZN TOB7Z-63 DC circuit breaker series is listed in 10A, 20A and 32A ratings, and the listing says it also supports up to 63A for larger configurations. The maker describes this range as a way to match protection to your PV string current. This page covers the 32A listing, so if you need a different rating, compare the separate listing in our alternatives section or ask us before you order. Your installer should confirm the current the circuit will carry.

Overload and short-circuit protection

The listing describes a thermal-magnetic tripping mechanism that protects against sustained overcurrents, which the maker says helps prevent overheating and potential damage. It also describes a rapid magnetic trip unit that disconnects the circuit during a short circuit, which the listing says minimises arc flash risk and equipment damage. Together, these two protection types are how this breaker is presented to buyers.

Breaking capacity and build

The listing gives a breaking capacity of 6kA and says the unit can interrupt fault currents up to 6000 amps. The maker describes the construction as using high-quality, flame-retardant materials, intended for longevity, reliability and safety in various environmental conditions. The listing does not give an operating temperature range or an enclosure rating, so do not assume either. Ask us if you need those details before you buy the TOMZN TOB7Z-63 DC circuit breaker.

DIN rail mounting and manual operation

The listing says the MCB mounts on a standard 35mm DIN rail, which the maker says makes it compatible with most electrical distribution boards and enclosures. It also describes manual operation with clear ON/OFF visual indication. Confirm the rail type and free space in your board before you buy the TOMZN TOB7Z-63 DC circuit breaker, and do not expect remote switching, because the listing describes manual operation only.

Specifications

The table below sets out the specifications for the TOMZN TOB7Z-63 DC circuit breaker, using only what the product listing gives.

These are listed specifications from the product listing.

How to use and set up the TOMZN TOB7Z-63 DC circuit breaker

The listing says installation should be carried out by a qualified electrician or solar technician who knows DC electrical systems and safety protocols. Before any electrical work, disconnect all power sources to the solar system, including both AC and DC sides, and use appropriate personal protective equipment. Do not begin work on a circuit you have not isolated.

Mounting: fix this breaker securely onto a 35mm DIN rail inside a suitable enclosure, such as a DC combiner box or distribution board. The listing says the enclosure should offer adequate protection against environmental elements. It gives no enclosure rating, so check the box with your installer, especially during the humid months in Bangladesh.

Wiring: according to the listing, connect the incoming DC positive and negative cables from the array or combiner box to the top terminals of the TOMZN TOB7Z-63 DC circuit breaker. Then connect the outgoing DC cables to the inverter or charge controller at the bottom terminals. Keep polarity correct and tighten to the typical torque of 2.5 Nm given in the listing. Work from your installer’s drawing, and recheck every connection before you energise the system.

Cable sizing: use DC-rated cables of an appropriate gauge for your current and voltage, as the listing advises, to avoid overheating and voltage drop. Ask your installer to confirm the gauge for each string before the cables are cut.

Testing: the listing says to perform continuity and insulation resistance tests after installation and before re-energising the system. Keep a written record of the readings so that your installer can compare them at a later visit.

Operation: the listing says the breaker is designed for manual operation, with ON meaning the circuit is closed and OFF meaning it is open. If an overload or short circuit occurs, the TOMZN TOB7Z-63 DC circuit breaker trips automatically to the OFF position. After a trip, find the cause before you switch the circuit on again, and ask a qualified person to inspect it.

Care and storage: keep the TOMZN TOB7Z-63 DC circuit breaker dry, clean and inside its enclosure until installation. Store it in a clean, dry place, keep its packaging, and inspect the terminals and enclosure at each routine maintenance visit. Look for signs of heat marks, loose wiring or damage, and stop work if you see any of them.

Setup tips: follow the maker’s instructions, isolate the system before any work, and never work on energised DC circuits. If your site has batteries and you are working during a power cut, isolate the system first and ask a qualified person to check the work.

Checklist: confirm the rating, mount on the rail, wire to the listed terminals, test, then re-energise. Keep the listing and your order details together so that you have the ratings to hand.

Compatibility and what is in the box

The listing describes the TOMZN TOB7Z-63 DC circuit breaker as suitable for DC applications up to 1000V in solar installations, including DC combiner boxes, residential rooftop systems, commercial and industrial projects, off-grid and on-grid systems, and solar street light and water pumping systems.

The listing does not confirm compatibility with particular inverters, charge controllers, panel models or combiner box brands. Check the maximum DC voltage and current your inverter and array will produce against the ratings above, and ask your installer to confirm the fit.

The listing does not state what is in the box for the TOMZN TOB7Z-63 DC circuit breaker, so the contents are not confirmed here. Ask us about the contents before you order, and check the delivered package against your order when it arrives.

Confirm your model and rating before you order, because the 10A, 20A and 32A ratings and the 63A series option are listed separately. Choose the rating only after you have the array current figures.

Who should buy it in Bangladesh

A rooftop homeowner in Dhaka, Chattogram or another city, with a DC array and a need for a DC-side breaker on a string or combiner circuit, should look at the TOMZN TOB7Z-63 DC circuit breaker. Ask an installer to size it against the array’s voltage and current before you buy.

A small commercial owner, such as a shop, office or warehouse with a solar array, may use the listing’s commercial and industrial description to shortlist the TOMZN TOB7Z-63 DC circuit breaker. The listing describes scalable protection for larger PV arrays, so check the wider design with an electrical contractor.

A solar installer or electrician who works on DC circuits may find a 2P breaker with the listed ratings useful for combiner boxes and inverter feeds. The TOMZN TOB7Z-63 DC circuit breaker suits people with the training to install it safely, and the listing itself asks for a qualified electrician or solar technician.

Households with an off-grid battery system, or a standalone solar street light or water pump, should consider this breaker only after an installer has checked the DC design. The listing names these applications but does not provide a full design guide for them.

A buyer who is replacing a breaker in an existing system should first note the rating, voltage and terminal layout of the unit being replaced. Then confirm that this breaker matches those figures, or ask your installer to recommend the right replacement.

A project planner comparing several DC protection options can use the listed 1000V DC rating, the 2P design and the 35mm DIN rail mounting as a checklist. Put the TOMZN TOB7Z-63 DC circuit breaker on the shortlist only if each figure fits the design.

Who should not buy it: anyone looking for a plug-in or ordinary home wiring product. The listing describes DC solar applications, so the TOMZN TOB7Z-63 DC circuit breaker is not the right type of product for everyday AC lighting or socket circuits.

Alternatives in our store

For smart wall switching, see SONOFF WiFi Smart Wall Touch Switch T3 UK 3 Gang- Compatible With Alexa, Google Assistant – Black Color, which is another smart wall switch in our range.

For a plug-in option, see LDNIO Z4 Universal Plug 6A Max (ABS V0), which is a universal plug in our range.

For a related listing from the same breaker series, see TOMZN TOB7Z-63 2P DC Circuit Breaker – 10A, 20A, 32A Solar PV MCB, 12V–1000V Wide Range DC MCB for PV System. Compare it with the TOMZN TOB7Z-63 DC circuit breaker on this page before you choose.

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

For general background on the wider category of connected plugs, see general background on smart plugs. That article is not specific to this breaker and does not describe it.

Browse the full range in our Smart Switches and Electrical category.

If you are unsure which listing fits your system, send us the rating and voltage you need with your question.

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). The full terms are on that page.

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

If you are ordering the TOMZN TOB7Z-63 DC circuit breaker for a specific array, send us the rating and voltage you need with your question so we can point you to the right listing.

Before you order the TOMZN TOB7Z-63 DC circuit breaker, confirm the rating with your installer. Then place your order, and expect the delivery times above once it has been dispatched.

Frequently asked questions

Is the TOMZN TOB7Z-63 DC circuit breaker made for solar PV systems?

Yes, the listing describes the TOMZN TOB7Z-63 DC circuit breaker as a 2P DC MCB designed for direct current applications in solar PV installations. It is listed for DC voltages up to 1000V.

Which current ratings are listed for this breaker?

The listing names 10A, 20A and 32A ratings and says the series supports up to 63A for larger configurations. Confirm the rating your array needs before you order.

Is there a 20A version of the TOMZN TOB7Z-63 DC circuit breaker?

Yes, 20A is one of the current ratings named in the listing. Check the rating in the product title before you order.

What DC voltage does this breaker support?

The listing gives a high DC voltage rating of 1000V and a voltage range of 12V to 1000V in the product name. The listing gives no other voltage limit for the TOMZN TOB7Z-63 DC circuit breaker.

Does the TOMZN TOB7Z-63 DC circuit breaker include a wiring diagram?

The listing does not mention a wiring diagram. It describes top terminals for incoming cables and bottom terminals for outgoing cables, so follow the maker’s instructions and check with a qualified electrician.

How is this breaker mounted?

The listing says it mounts on a standard 35mm DIN rail inside a suitable enclosure, such as a DC combiner box or distribution board.

Does the TOMZN TOB7Z-63 DC circuit breaker need a qualified installer?

The listing says installation should be done by a qualified electrician or solar technician familiar with DC systems. Disconnect all power sources, including AC and DC sides, before any work.

What is the warranty on the TOMZN TOB7Z-63 DC circuit breaker?

The listing gives a 7 Days seller warranty for this breaker. Ask us about the warranty before ordering if you need more detail.

Can I return the TOMZN TOB7Z-63 DC circuit breaker and how do I pay?

Yes, you can return it within 7 days of delivery, and you pay cash on delivery. See our Delivery and Returns policy for the full terms.

How long does delivery take for the TOMZN TOB7Z-63 DC circuit breaker?

Delivery usually takes 1–3 days inside Dhaka city and 2–5 days outside Dhaka. We deliver all over Bangladesh.

Does this breaker suit an off-grid battery system?

The listing names off-grid solar systems as an application, but it does not give a full design for battery-based systems. Have an installer confirm the DC voltage and current before you buy.