LV Transformers

New and refurbished LV transformers
— for sale or hire

Low Voltage Industrial Transformers

We are a leading UK supplier of quality new and refurbished low voltage (primary and secondary both <1000V) industrial transformers.

Manufactured and tested in accordance with internationally recognised standards (IEC60076, IEC61558 or equivalent), we supply highly reliable transformers to cover all common applications, including:

Testing & Measurement

Generator Set Step-Up

Variable Speed Drives

Industrial Machinery


New LV transformers can be supplied complete with a range of IP rated enclosures and protection to meet your exact requirements. We also have a large stock of secondhand LV transformers for immediate purchase or hire.

We sell and hire LV transformers on a ‘supply only’ basis, or with optional on-site installation and commissioning by our own Contracting division.

Need assistance with a low voltage transformer?
Discuss your requirements with our experts today.

Air Cooled Low Voltage Transformers

We supply many types of LV transformer to meet any primary & secondary (or multi-tapped) voltages and other characteristics that you require.

From orders of a single unit to 100+ units, each transformer is designed and manufactured to customer specification. Common primary and secondary voltages include 110V, 220V, 230V, 240V, 380V, 400V, 415V, 440V, 480V, 600V, 660V & 690V.

LV Transformer Types:

  • Auto-transformer or double-wound
  • Single, two or three phases
  • Step-up or step-down transformer
  • Isolating transformer
  • Auxiliary transformer
  • Motor starting transformer
  • Phase shifting transformer
  • K-factor transformer
  • Transformer rectifier
  • Excitation transformer


  • 1kVA to 1000kVA
  • Primary & secondary voltages (or multi-tapped) to customer specification
  • 50 or 60 Hz Frequency
  • Star, Delta, Delta-Star or other winding connections
  • Open or with IP rated enclosure
  • Lead time 2-4 weeks


100kVA 415/600-660-690V 3ph 50hz auto-transformers (open style)

Oil Cooled or Cast Resin Low Voltage Transformers

In addition to smaller air cooled LV transformers, we design and supply larger double wound three phase liquid cooled or cast resin low voltage transformers for more demanding loads or specific applications, including step-up from large diesel generators.


3MVA 480/600-660V delta connected ONAN transformer

Options available include:

  • Mineral oil (ONAN), MIDEL (KNAN) or silicone (LNAN) cooled with BS type bolt-on radiator or corrugated tank
  • Primary & secondary voltages (or multi-tapped) to customer specification
  • Aluminium or copper windings
  • Ratings from 200kVA to 5000kVA
  • Cast resin (ANAN) dry type, IPOO (open) or with IP rated enclosure
  • Ecodesign Tier 2 losses
  • Star, Delta, Delta-star or other connections as required
  • Fan cooled ONAF/ANAF

Do you prefer to get in touch with us via email?
No problem, we will respond to your enquiry without delay.

Low Voltage Transformer Hire & Services

With a large fleet of immediately available transformers (see list below), we specialise in urgent LV transformer hire and regularly dispatch units nationwide for same or next day delivery. In fact, some generator and plant hire companies use our hire transformers as their in-house transformer fleet.

We also hire transformers to many other industrial and commercial users and provide services to owners and operators of LV transformers.

Transformer Hire

  • Wide variety of voltages, types and connections, including:
  • 415V/600V-660V-690V
  • 415V/415V isolating transformers
  • See full stock list below
  • MV & HV transformers & switchgear also available for hire
  • Ratings from 30kVA -1500kVA
  • Same or next day dispatch and collection
  • Account facilities available for established companies
  • Short & long term hire available

Services available:

  • Transformer installation
  • Transformer testing
  • Transformer repair
  • Transformer emergency call-out
  • Transformer cable works
  • Transformer upgrades
  • Transformer spare parts
  • Transformer removal & purchase


Low voltage transformer hire fleet

Why Choose Slaters Electricals?

We pride ourselves on our ability to supply quality transformers to suit your requirements on a short lead time and our renowned after sales service.

With almost 100 years of transformer engineering experience and know-how, our success is built on consistently exceeding our customer’s expectations and an exceptionally high number of returning customers.

Take the Next Step…

Experienced Electrical Engineers know to always call Slaters first.

Browse Our Stock of LV Transformers

Here is just a small selection of the many low voltage transformers we currently have in stock: