About ITL


At Instrument Transformers Limited (ITL), or as we are lovingly called by our customers "those go-to CT and VT guys", we have been designing and manufacturing low voltage current and voltage transformers for a wide range of equipment. You can find our units in GIS Switchgear, Vessel Propulsion, Substation Automation, Power Factor Correction, Tariff Measurement & Power Plant Protection to name but a few, all across the globe.

Over the years we have built the desirable reputation of providing durable, well designed, cost-optimised and quickly delivered low voltage transformers and associated products. We are very customer-focused, it is a part of the ITL DNA. We act quickly and listen to our customers' often complex needs. Our highly qualified and knowledgeable engineering team always strive to find the best commercially and technically optimal solution for every single project.

Our continuing long term strategic growth plan has seen us expand our manufacturing facility & improved our production capabilities over the past couple of years. Our main facility in East Kilbride, Scotland since 1974. We are continuously looking to expand our product portfolio and thus become a one-stop-shop for our clients. In addition, we have formally added ISO 14001 - Environmental Management System, and ISO 45001 - Health & Safety Management System to augment our long-established ISO 9001 Quality Management System.

Having recognised opportunities in the renewable sector, the company has established ITL Renewables specifically to support our customer Transformer & Sensor technology requirements in this fast-growing onshore & offshore industry.

As an ethical business practitioner, we are also a signatory to the UN Global Compact and have successfully implemented & been audited to ISO 26000 standard on Social Responsibility.

Instrument Transformers Limited Design

If you have any questions, please contact us today on +44(0)1355236057 or on our e-mail sales@itl-uk.com

What is it we do?


CT Design

We have over 40 years of experience in current transformer design which gives us the confidence to say that we can provide the very best solution for our customers. With the desire to remove additional “Red Time” from our processes & procedures, in order to compress lead times and thus provide additional service enhancements, we have embarked on a revised lean techniques programme throughout our new facility.

Our custom range of CTs includes protection current transformers & measuring current transformers and the choice of ring-type CT, rectangular CT, square CT, and oval CT (also known as a stadium CT). It can be confusing, right? Luckily, our technical team are professionals and always willing to give you a helping hand to choose the right solution for your project.

Current Transformer Design

Instrument Transformers Limited Design

Voltage Transformer Design

VT Design

We provide voltage transformers (sometimes referred to as potential transformers or PTs) in three different sizes and for both protection and measurement applications. Our designs are fully suitable for IEC 61869 as well as other international standards such as IEEE (USA) & AS (Australia).

The excellence of our designs comes from our own knowledge and experience in the field as well as from our cooperation with our international partners. We recently moved to new premises and started utilizing revised lean manufacturing system in our manufacture processes in order to offer our customers the shortest lead time possible and designs optimized to match the project specifications.

If you have any questions on how we can help you, please feel free to contact us through our contact form or on our phone number! Looking forward to hear from you!


Applications for our transformers

Specifically designed instrument transformers for industrial applications, our range can be manufactured to many international standards such as IEC, IEEE & AS.

Unique instrument transformer installation solutions for vessel propulsion systems.

Protecting equipment and measuring power in the world's most iconic buildings

Preferred lead supplier to many utilities around the world for product reliability and accuracy.

Renewable energy
Located on the edge of Europe's largest wind-farm ITL solutions can be found in Large or Small wind. Check out our sister company ITL Renewables The Transformer Hub for all your renewable project needs.

How quick can we do it?


Several years ago ITL recognised that the market was undergoing significant changes in terms reducing switchgear & panel board lead times. Most if not all of our competitors, including ITL were routinely offering lead times of 5,6,7+ weeks for protection current transformers and measuring current transformers, whether it be an indoor transformer , outdoor transformer or severe environment transformer types.

As a customer focused business it was clear to us that we had to reduce lead times in a constructive manner. Working closely with our key customers and Scottish Manufacturing Advisory Service (SMAS) we embarked on a program of Lean Manufacture.

Encompassing business processes such as design, procurement, administration and production, end to end, with techniques such as 5S, Red / Green analysis & visual manufacturing. We continue to improve our overall service to our customers with lead times routinely 2-3 weeks and at times of customer emergencies a matter of days.

Instrument Transformers Limited has embraced "Lean Principles" throughout our company and imparting actively imparts them within our supply chain. For the reduction and finally the eradication of waste in our product & processes. This will ultimately help promote a positive experience for our global customers and re-enforce our position as a leading solution provider.

Instrument Transformers Limited Lead time


Instrument Transformers Limited Design

With an ever changing industry we understand that switchgear & control panel builders have at times lost CT & VT knowledge skill sets and as such are unable to select the optimised solution for their projects.

At ITL we provide that knowledge bridge, our highly skilled instrument transformer design engineers can advise you on the most appropriate current & voltage transformer for your application.

Via discussions with customers we consider:

  • Ratio of Transformer
  • Burden or VA
  • Accuracy Class (0.2s, 0.2, 0.5s, 0.5, 1 etc.)
  • Protection Relay Used (Class PX, TPS, 5P, 10P etc.)
  • Limiting Dimensions
  • Installation Environment (Indoor / Outdoor)
  • Preferred Transformer Finish (Tape, Resin Encapsulation, Oil Filled)
  • Insulation Level
  • International standard (IEC, ANSI/IEEE, AS, CAN)

We will then submit an offer based on the information provided.