Power Circuit Breakers

for safety and protection


Terasaki Introduces NEW 400A CBR

Terasaki presents the TemBreak 2 CBR range.

Circuit Breakers with Residual
Current Protection (CBR)

Now available in 3 frame sizes utilising the proven and trusted TemBreak 2 MCCB platform - 125AF, 250AF and 400AF, providing protection from 20A up to 400A.

When people and high-power devices come into contact, you want to be sure that not just the devices are protected, but that the people operating them are too.

Our CBRs provide 3 types of protection protecting people, installations and equipment

  • Protection from electric shock
  • Protection from overloads
  • Protection from short circuits

You can read more about our new product and its features by downloading our leaflet via the following link:

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Your Invitation to Middle East Energy 2024

We are once again exhibiting at the upcoming Middle East Energy exhibition within the BEAMA Pavilion of the World Trade Centre in Dubai.

MEE logos

At this years event, we unveil the newest products in our 'Powering Today Connecting Tomorrow' series; previewing our new compact ACB and MCCB ranges, TemPower PRO and TemBreak PRO. We would like to invite you to visit us at our stand, H2.F10. The Terasaki stand will be open: 10:00 - 18:00 on 16th - 18th April 2024.

If you have not registered to attend the exhibition yet, you can do so for free by clicking below:

See you in Dubai!

MEE logos

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Can Networked Circuit Breakers Be Reset or Turned On Remotely?

Terasaki have existing technology, such as the TemPower 2 Auto Racker and Remote Controller, that allow you to operate circuit breakers remotely.

However, did you know that you can also operate circuit breakers remotely through a network using their data communication link?

Check out our latest video which explains everything you need to know about this safety feature:

Networked circuit breakers are beneficial for a number of reasons:

  • Allows for remote operation within sites that are secure, unmanned or hard to access.
  • The ability for information reading and monitoring of multiple circuit breakers.
  • Simpler working practices.
  • Rock solid safety!

For more information or queries on how this could be implemented in your workplace, please do not hesitate to contact us:

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50 years of Success in Europe

Terasaki Electric (Europe) Ltd. (TEE) was established in 1971. Our 50th anniversary passed without celebration due to COVID-19 restrictions.

Marking Our Milstone Year

Terasaki will mark the milestone with a year of activities in 2024 for staff, customers, and local charities. The year will begin with Neil Gillespie, Scottish Enterprise’s Chief Executive Officer presenting a commemorative plaque marking 50 years in Scotland.

The year of activities will coincide with Terasaki Electric Co. Ltd, Osaka, Japan, starting their 100th anniversary year celebrations in October 2023.

Terasaki's Next 50 Years In Business

Managing Director, Vaughan Turner, stated that TEE’s year-long programme of events will be based on the theme “Terasaki’s next 50 years in Europe”. As well as raising money for local charities the events will support the introduction of newly developed high-tech, SMART technology products and TEE's drive into the electrical protection of renewables such as photo-voltaic, wind turbine, battery and hydrogen technology.

Established in Scotland

Terasaki was established in Scotland in 1971 under the leadership of the late Managing Director, Gerry Wiseman, and was the first Scottish/Japanese joint-venture. With a great amount of support from the then Scottish Development Agency, the Company set up the first European distribution hub in Hillington Industrial Estate, Glasgow. TEE’s success has meant that it has expanded over the 50 years, and now has branches in Sweden, Italy and Spain. TEE work with a network of technical sales representation companies throughout Europe, Middle East, Africa, and South America.

Teraski Staff

European Business

The longevity of the European business has had its roots in continuous product development and in the unique relationship between the top management of the parent company and the management team in Scotland. This has always been based on trust and a clear understanding of where the market knowledge and commercial expertise lies. Strategic decisions are taken on the basis that local personnel know their market best.

Terasaki Focus

The strong focus on product development and a commitment to dynamic succession planning means that the Company is looking forward with confidence and a clear strategic direction for the next 50 years.

You can read about Terasaki's innovations over the past 100 years here:

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Terasaki's Net Zero Committment

Terasaki Electric (Europe) Ltd has joined forces with our new carbon partner, Auditel, to deliver our objective of becoming Carbon Neutral whilst on our longer-term objective of reaching Net Zero by 2050.

Teraski Carbon Committment

The whole team at Terasaki is committed to developing a progressive Carbon Management Strategy to reduce carbon emissions arising from its activities.

Our Environmental Mission

  • We endeavour to make our activities and products climate-neutral.
  • We have a business objective to implement processes to achieve Net Zero.
  • We have a strategic objective to develop an internal and external business process to deliver net zero to the organisation.

You can read our whole press release here:

Auditel Logo

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Obsolete Switchgear Components?

Terasaki can help!

Terasaki offers advanced retrofit solutions for outdated switchgear systems. With our state-of-the-art technology and expert team of engineers, we can upgrade your switchgear to meet the latest industry standards and improve your facility's overall performance.

But don't take our word for it – check out our latest video which explains everything you need to know about retrofitting:

Our retrofit solutions are designed to reduce your energy consumption and maintenance costs, increase your system's reliability and safety, and extend the lifespan of your equipment. Plus, with Terasaki's industry-leading customer support and maintenance services, you can trust that your switchgear will continue to operate at peak performance for years to come.

Don't let outdated switchgear hold your facility back any longer. Contact us today to schedule a free site visit or learn more about our retrofit solutions. Thank you for considering Terasaki for your switchgear needs.

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Demand for renewable energy continues to grow

Solar Ready

Solar is one of the key components of the renewable energy mix.

Solar farm developments are rapidly becoming larger. The challenge exists to reduce the cost of long runs of cables by transmitting power from PV strings at higher voltages.

Terasaki provide type-tested ranges of circuit breakers suitable for these higher voltages

  • ACBs and MCCBs - including new 400A MCCB: VE400-NE
  • AC up to 800V
  • DC up to 1000V

We have a new leaflet which details all the information you need about the circuit breakers suitable for solar power.

If you would like to enquire or have any questions, please don't hesitate to contact us.

Tempower 2 Logo

Tembreak 2 logo

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Meet Our President: Come See Us At Middle East Energy 2023

Terasaki at Middle East Energy 2023

We are once again exhibiting at the upcoming Middle East Energy exhibition within the BEAMA Pavilion of the World Trade Centre in Dubai.

Company president Taizo Terasaki will be in attendance at this years event, as we unveil the newest products in our 'Powering Today Connecting Tomorrow' series.

We would like to invite you to visit us at our stand, H2.G11. The Terasaki stand will be open: 10:00 - 18:00 on 7th - 9th March 2023.

If you have not registered to attend the exhibition yet, you can get your exhibition pass here!

See you in Dubai!

Middle Estern Energy Logos 2023

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This Might be the Best Way to Fix Unsafe Switchgear.

Are you worried about old or obsolete switchgear in high risk facilities? We've helped many relieved end-users and installers to improve the safety and reliability of old equipment.

Man at circuit breaker

With travel restrictions coming to an end, Terasaki are once again free for site visits. If you feel that you would benefit from a site inspection, you can request our expertise by email.

Electrical maintenance in critical installations is a fast moving discipline, with increasingly strict regulation and many new technologies. It can be difficult to balance the objectives of eliminating hazards to personnel and ensuring a reliable supply with the restrictions of tight budgets.

Our case studies and testimonials illustrate our expertise in switchgear maintenance and retrofits.

You don't have to take our word for it. Our work at nuclear power installations means that we are pre-qualified to the highest possible level for a supplier who works on operational sites owned, managed or controlled by utilities in the UK (UVDB verify, category B2). UVDB is the utility industry pre-qualification system used across the UK. This system helps utilities achieve the highest standards of supply chain assurance.

Top 5 Reasons to Retrofit

Find out more about retrofit in our catalogue: 

Download our Direct Response Catalogue

Sainsbury's Retrofit

Sainsbury's shop front

Read about the improvements we helped Sainsbury's make to the power system at their headquarters in Holborn, London.

Direct Response

Man at circuit breaker

We also offer the following services: discrimination analysis, fault diagnosis, ductor testing, service and maintenance, arc hazard reduction.

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Fast Deliveries and Quick Answers: Terasaki, Cleaner EV and Specialist Switchgear Systems Support On-Time Dedicated EV Bus Depot

On 11th July 2022, Abellio London Bus announced that it had opened the doors to its brand-new depot for West London. The Hayes depot will be the home of new state-of the art EV buses.

Dawley Road is one of multiple EV bus depot projects in London.

Dawley Road Bus Depot

Low voltage distribution equipment was designed and built by Specialist Switchgear systems using Terasaki Air and Moulded Case Circuit Breakers.

Cleaner EV Ltd managed the scheme design, carried out the engineering, procurement, construction, installation and co-ordination with energy supplier Enel X Way.

You can view all of Terasaki's project references here, or view the full EV bus depot case study by clicking below:

Download Dawley Road Bus Depot Case Study

If you would like to find out more about this case study or the bus depot projects, please do not hesitate to contact us:

Contact Terasaki

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Understanding RCD Blinding: Causes and Solutions

Electronic equipment operating normally can induce DC earth-leakage current in circuits. EV charging equipment is one common source of DC earth-leakage current.

Type A RCDs typically provide upstream protection for multiple EV chargers. They protect against AC earth-leakage current but do not provide protection from excess DC earth-leakage current. This is not necessary when Type B RCDs are the first line of protection. However, the operating coils of some type A RCDs can be saturated by DC earth-leakage current. This can have an impact on their ability to operate correctly. This phenomenon is known as “blinding”.

EV Charge Point

Our downloadable guide explains the causes of blinding, and offers solutions.

Download: RCD Blinding - Causes and Solutions

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High Reliability and Safety at Sea

Visit us at SMM Hamburg 2022

Reliability and safety at sea - hamburg

Terasaki Electric Co. Ltd will be exhibiting next month at the 30th SMM exhibition and representatives from Terasaki Electric Europe will be in attendance.

SMM (Shipbuilding, Machinery and Marine Technology) is the leading international trade fair for the maritime industry. The event will take place at the Hamburg Exhibition Centre in Hamburg, Germany, from 6th - 9th September 2022.

We would like to invite you to visit us at our stand B6.322.

If you have not registered to attend the exhibition yet, you can do so by clicking below. See you at SMM.

Get your e-ticket for "Driving the maritime transition -hamburg"

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Terasaki MCCBs in Italian Railways

Rete Ferroviaria Italiana (RFI) the Italian Railway Network trust Terasaki MCCBs in critical control room and trackside applications.

Using our 1100VAC rated TemBreak 2 125A frame VS125-NJ with plug-in kit and motor operator, the MCCBs are used for such applications as management of emergency lighting in tunnels, voltage elevating and lowering along the 1000VAC trackside electrical backbone and for signalling such as at level crossings.

Terasaki 1100VAC Circuit Breakers

Terasaki 1100VAC Circuit Breakers

RFI’s installed base of Terasaki MCCBs have proven operability and reliability over many years in demanding environments and continue to be chosen for their system and installation upgrades.

Below is a video of an RFI upgrade project featuring TemBreak 2 VS125-NJs with motor operators being shown in the control room:

Other highlights within video:
7:30 - Breakers displayed in a trackside application
9:03 - Products shown in system and described as upgrade to technology

Railway trackside is a typical application for the VS range where higher voltage systems are used to reduce cabling costs for long cable runs. Such systems are increasingly adopted where load and switchgear are separated by long cable runs such as:

  • Mines
  • Oil and chemical plants
  • Airports and computer centres

Technical details of the complete TemBreak 2 1100VAC VS range are available in our catalogue, which you can download here:

Download -Mining Circuit Breakers- Catalogue

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Sakura Leader - Ship of the Year

In May 2021, the 'Sakura Leader', a cargo vessel owned by Nippon Yusen Kaisha (NYK) was given the 'Ship of the Year' award by the Japanese Society of Marine Engineering.

The vessel is equipped with Terasaki circuit breakers, both ACBs and MCCBs as well as an integrated monitoring and control system, TERANET50X.

Sakura Ship of the year

Photo Courtesy: NYK

Sakura Leader was the first large-scale liquified natural gas fueled vessel to be built in Japan, and was selected for the award due to efforts to reduce greenhouse gas emissions. It is deemed as a model project as it reduces CO2 emissions during voyages by making use of an alternative fuel. It is a next-generation eco-friendly ship that makes it possible to reduce the use of air pollutants, compared with conventional ships that use heavy oil as fuel.

This is the latest project in which Terasaki continues its 'net zero' commitment as part of the climate change solution.

Commited to net zero emissions

Terasaki have committed to achieving net zero emissions by 2050 as part of the UK’s Business Climate Leaders campaign. When you buy from us you can be confident that we are doing what we can to reduce our impact on the environment.

In addition to this, we must remind you that we support your 'right to repair'. Energy consumption and waste can be reduced by extending product lifespan and designing in repairability.

Read how Terasaki supports Right To Repair

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Switching and Protection For Batteries 1MW+

If you need switches and protection for MW-scale DC power systems we can save you space and money.

You don't need to go for expensive solutions like Air Circuit Breakers for high-ampere DC circuits. Use DC moulded case circuit breakers and switch-disconnectors, specially developed for high-current equipment.

Moulded Case Ciscuit Breaker XS1600ND

The benefits of using DC moulded case circuit breakers:

  • Reduces system dimensions
  • Optimises size to budget
  • Can be used in numerous solutions (UPS, renewables and more)

For more information and a full specification of these products, please download our leaflet

Download DC MCCB Leaflet

You can also contact us for more information or to request a quotation:

Contact Terasaki

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COP26 - Terasaki's Climate Commitment

The 2021 United Nations Climate Change Conference (COP26) is being held in Glasgow, between October 31st and November 12th.

Terasaki Electric (Europe) Ltd have taken an important first step to becoming part of the climate change solution, committing to Net Zero and becoming a UK Business Climate Action Leader.

Commited to net zero emissions

We are part of the United Nations’ global ‘Race to Zero’ campaign, the largest credible alliance of organisations working towards an emissions-free economy.

Terasaki have committed to achieving net zero emissions by 2050 as part of the UK’s Business Climate Leaders campaign. When you buy from us you can be confident that we are doing what we can to reduce our impact on the environment. The decision makes sense for us, our customers and the planet.

Here are some examples of our support for local renewable energy projects:

AWS Ocean Energy

Terasaki provided technical advice and supplied circuit breakers to AWS Ocean Energy for use in their Archimedes Waveswing wave energy converter. The prototype Waveswing is being built at a fabrication facility at Westway Dock in Renfrew, Glasgow.

Read about AWS Ocean Energy's Archimedes Waveswing

Whitelee Windfarm

Terasaki ACBs protect 140 turbines at Scottish Power's Whitelee Windfarm, the UK's largest onshore windfarm.

Read about Terasaki supporting Whitelee Windfarm

Aws ocean energy component Whitelee windfarm

Right to repair

Governments recognise that energy consumption and waste can be reduced by extending product lifespan and designing in repairability. Terasaki supports your ‘right to repair’ (we always have)! You can read more about this here:

Read how Terasaki supports Right To Repair

Terasaki use renewable energy sources to help power and heat our factory. This includes use of solar panels and our biomass heating system, which now accounts for 40% of the building's heating.

We expect that COP26 in Glasgow will focus our sustainability activities and will challenge us to improve. We urge delegates to agree outcomes that will inspire practical climate action.
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4 Questions Answered About Switchgear for Large Solar Plants

The trend in solar power generation is to collect power at higher voltages. In principle higher voltages minimise power loss in cables. Here we answer 4 questions about switchgear for those voltages.

1Is there a range of circuit breakers for use at 800V AC?

VE400-NE AR440-SB-V8



Terasaki have Air Circuit Breakers (ACBs) and Moulded Case Circuit Breakers (MCCBs) suitable for 800V AC

2 I need switchgear to feed a 5MVA transformer. It should collect power from 25 inverters of 185kW each. This is a big system. 3600A. Is there a main circuit breaker that can handle this power at 800V AC?

VE400-NE hand sketch


Terasaki have launched the AR440SB-V8 Air Circuit Breaker. It can handle the power input to a 5MVA transformer at 800V AC. You can use it as the main outgoing ACB feeding a transformer in a large solar generation plant.

3I’m worried about short-circuits. Can circuit breakers work properly when the fault level is 30kA or 50kA at 800V AC?

Terasaki have circuit breakers which can safely interrupt short-circuit currents of up to 50kA at 800V AC. The new AR440SB-V8 can handle this fault current.

4 I don’t want to experiment. Is this technology tried and tested?

Terasaki have short-circuit-tested their range of 800V circuit breakers at independent test laboratories. Top-rated solar plant developers like ANESCO in the UK have used Terasaki circuit breakers to protect their equipment.

If you want to find out more, you can download our data sheets or contact us by clicking below:
Download VE400-NE Data Sheet Download AR332H-V8 Data Sheet Download AR440-SB-V8 Data Sheet
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Terasaki take the gold at the Olympic Games in Tokyo

Terasaki's circuit breakers have been selected for powering and protecting some of the venues and facilities being used at this years summer Olympic games, currently being held in Tokyo.

Olympic podium with Terasaki cicuit breaker in position 1

The buildings containing Terasaki products had a total construction cost of $1.5 Billion. These include:

  • New National Stadium Japan
  • Ariake Arena
  • Acquatics Center
  • Canoe, Slalom Venue
  • Hockey Venue
  • International Exhibition Hall (Press Center)
  • National Training Center
  • Setagaya Ward General Sports Ground
  • Olympic Village Dining
Olympic venues montage Tokoyo
Photograph Credit:

New National Stadium
De Arne Müseler / www.arne-mueseler.com, CC BY-SA 3.0
International Exhibition Hall (Press Center)
De Morio - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=476368
Ariake Arena
De Arne Müseler / www.arne-mueseler.com, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/de/deed.de
Aquatics Center
Fuente: https://olympics.com/
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Terasaki supports your 'right to repair' (we always have)!

Recent UK government legislation raises the bar for reducing energy consumption and improving product lifespan by designing in repairability. The regulations which cover domestic white goods, televisions and some commercial appliances, enshrine in law that manufacturers are required to make spare parts for products available to help extend the lifespan of products and reduce non-recyclable waste.

Although circuit breakers are not yet included in such legislation, design for repair and design for service have long been a part of Terasaki’s design philosophy. Further, there is no built-in obsolescence with our products with circuit breakers powering and protecting your operations trouble free for decades.

man at breaker

Terasaki has leadership in supplying circuit breakers to the marine industry for good reason. The industry demands ease of fitting, ease of repair, long product life, ease of replacement and short turnaround for maintenance.

Born of our heritage in meeting the exacting demands of the marine industry, Terasaki breakers have a number of exclusive innovations not provided by other manufacturers.

  • TemPower 2 key components are repairable on-site by the user
    • Our double break contacts
    • Isolating contacts
    • Racking mechanism
  • Tempower 2 design incorporates its isolating clusters and racking mechanism on the ACB body
  • Designed for long trouble-free life – Mean Time Between Failures (MTBF)
    • ACBs – 27.4 years
    • MCCBs – 26.5 years
  • Protection Relays and Accessories
    • All our ACB and MCCB protection relays and accessories are designed to last the lifetime of the breaker – no need for repeated replacements

Terasaki’s ACBs and MCCBs are backed up by our renowned Direct Response Service Division providing fault diagnosis and circuit breaker maintenance and repair where you need it, when you need it with minimal disruption to your operations.

Our retrofitting services allow modernisation of the protection system reusing rather than replacing the static components of the existing switchboard (steelwork and busbar system).

Terasaki - Built-in long life, repairability and maintainability.
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440V Power Factor Correction

Modular Trays

UK Customers Only

In line with our ongoing commitment to provide the market with practical product solutions and offer great value, high quality and reliability, we are pleased to advise that we have invested in stockholding of a range of 440V modular trays available for immediate delivery to complement our popular 400V products.

440V Modular Trays

  • Perfect for 400v, 415v and 440v supply systems
  • Physical dimensions are the same for 440v as for 400v
  • For convenience, our pricelist includes the different kVAR ratings for each voltage supply application (see download attached)
  • Detuned options also available from stock
440V Modular Trays 440V Modular Trays

View Prices for 440V Modular Trays

For further details, please contact your local Terasaki representative as below or our dedicated Sales and Applications email.

Regional representatives: -

Scotland & N. Ireland Gary Connelly Gary.Connelly@terasaki.co.uk 07785 577 318
Northwest Norris Lawton Norris.Lawton@terasaki.co.uk 07801 188 230
Northeast Keith Gray Keith.Gray@terasaki.co.uk 07932 057 221
Midlands Gareth Rowlands Gareth.Rowlands@terasaki.co.uk 07770 284 591
Southwest & South Wales Matt White Matt.White@terasaki.co.uk 07973 730 203
London & Southeast Nigel Richardson Nigel.Richardson@terasaki.co.uk 07768 541 392
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Video Interview - Terasaki

David Wales on Dynamic Discussions with ACDC Dynamics

Export area manager, David Wales, recently appeared on Dynamic Discussions, a video interview series developed by Terasaki's South African partner ACDC Dynamics.

In this video interview, which you can view below, David discusses the history of Terasaki and explains why our products are elite in the field of circuit protection.


Perhaps you have some questions about Terasaki and our products that David was not asked in the video. You can ask David anything here:

Ask David

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Who Else Wants to Reduce Electrical System Downtime in Hospitals?

NHP, Terasaki's partner in Australia, has recently released a case study featuring Terasaki AR ACBs. You can view the video below:

The power distribution infrastructure at Monash Medical Centre in Melbourne was end of life and needed to be replaced. NHP met with the hospital to understand their requirements and recommended a SMART closed transition switch solution made possible by the Terasaki ACB, which guarantees a seamless transition from mains power to generator. This has reduced the need for months of planning for when the hospital undertakes mandatory quarterly testing of its generators, all the while keeping patient safety at the forefront.

Please visit the project references section on our website for more examples of case studies/projects where our TemPower 2 ACBs have been applied.

View Terasaki Project References

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TemPower 2 ACB - Auto Racker and Remote Controller

Have you heard about our new TemPower 2 ACB auto racker and remote controller?

Subscribe to our updates via the link below and you'll automatically receive an email with the brochure attached and a link to the full auto racker video:

Subscribe for updates on TemPower2 Auto Racker and Remote Controller

If you are interested or would like more information on this product, please do not hesitate to email us.

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Air Circuit Breakers with - Intrinsic Reliability

Quality is in everything we do.

From the design office to the factory floor, quality is part of the ethos by which we all operate at Terasaki.

Quality overarches design for manufacture, design for maintainability, manufacture for reliability and results in long and trouble-free product life for our customers.

It’s in our corporate DNA.

Take, for example, our TemPower 2 ACB range. Elegant design includes unique features such as: -

  • Our "Double Break" contact system ensures extremely fast interruption of short circuit currents. Energy is dissipated at two points on each pole within the breaker resulting in minimised erosion of the contacts and increasing the reliability of the breaker.
  • Our proprietary active sensor system continually monitors temperature of the conductors at the contacts and can signal an overheating alarm before irreversible damage occurs.
  • Uniquely, TemPower 2 ACBs have their isolating clusters and racking mechanism on the ACB body rather than the chassis. Having all the maintenance touch points on the body side allows shorter time to repair (MTTR) and minimal downtime.

But don’t just take our word for it, download the pdf to reveal more detail of these innovative features. Take a look at the testimonials of our customers in critical applications, harsh environments and remote installations.

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Prevent Arc Flash with Safe Distance Devices

Direct operation of switchgear is one of the most frequent exercises that exposes an operator to risk.

Safe Distancing

Remote switching permits operation of the circuit breaker at a safe distance. Circuit breakers can be opened and closed from a remote location, removing the operator from the area of risk, and allowing a reduction in the level of personal protective equipment (PPE) required for the operation.

Using the Terasaki ACB remote controller provides a safer operating environment for personnel through the proven method of adding distance between the operator and the risk.

ACB remote controller

ACB remote controller:

  • Lead length: 10m, 15m or others on request
  • Plugs into socket on ACB front cover
ACB Remote Controller ACB Front Cover ACB

ACB Remote Controller

Plug the controller into the socket on the ACB

Switch on the ACB from a safe distance.

Please contact us if you require more information

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Exhibitions 2020 – Come Visit Our Stands

You will be able to see Terasaki exhibiting at the following events in 2020:

  • Middle East Electricity
  • Tue 3rd – Thu 5th March 2020
  • World Trade Center, Dubai
  • Stand H2.F20 – BEAMA Pavilion
  • Data Centre World
  • Wed 11th – Fri 13th March 2020
  • ExCel London
  • Stand D372
  • Hannover Messe
  • Mon 20th – Fri 24th April 2020
  • Hannover, Germany
  • Hall 12, Stand B73

Please contact us if you require more information

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How 800V AC on Large Solar Farms Reduces Cost

You can significantly reduce the cost of equipment for large solar farms by spending less on cable. Developers want to achieve this by transmitting power at higher voltages. Lower currents will be carried to the “collector” switchgear by cable with smaller cross-sectional area and lower cost. The trend is to transmit at 800V AC.

Terasaki support this opportunity for developers to reduce cost. We’ve type-tested a new range of circuit breakers for 800V AC. The VE400-NE MCCB and AR3H-V8 ACB handle fault currents up to 30kA at 800V AC. Current ratings from 100A to 3200A.

Download the Data Sheet
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We have listened to you: new GroupStak developments

Download our leaflets for GroupStak

Following the recent successful roadshow we have taken on board customer feedback and have developed the GroupStak to include the following features:

Form 3b solution.

The GroupStak switchboard is now developed to include a form 3b option. This offers a higher stacking density at lower price than the standard form 4b version. Maximum number of feeders of different types are listed below:

  • 56 - single pole MCCBs, max 125A
  • 21 - 3 pole MCCBs, max 160A
  • 17 - 3 pole MCCBs, max 250A
  • 12 - 3 pole MCCBs, max 400/630A

Electronic feeders

GroupStak is now design verified with outgoing MCCBs with electronic protection.

TemBreak 2 MCCBs from 250A frame to 630A frame are available with electronic protection units. Current ratings, In, of 40A, 125A, 160A, 250A, 400A, 630A are available. These offer flexibility as their characteristics can be set between 0.4 and 0.1 times In.

Every TemBreak 2 electronic protection unit includes overload protection (L), delayed short-circuit protection (S) and instantenious protecion (I) as standard. Metering and CTs

Metering and CTs

GroupStak has now been developed to accept Rayleigh’s Easywire plug and play meters and CT's.

The steel work is pre-drilled for ease of mounting with pre-cut clear cover plates and door cuts-outs on request.

Spare ways

Many specifications request provision for future additions (spare ways). GroupStak can have spare ways included without MCCBs fitted. They have pre-coppered to the main bus bar making it a quick and easy job to add future MCCB outgoing devices.

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