Bespoke Industrial Transformers

TH Series Of Fixed Transformers up to 25kVA



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Floor / wall mounting transformers with a wide range of voltage ratios and ratings up to 25kVA, housed in steel enclosures rated up to IP55 with a range of finishes, made to order. If you would like to discuss a bespoke transformer, please click on the Enquire button, forward your details and we will contact you to discuss your requirements.

TH series Heavy Duty, double wound, enclosed type, industrial transformer assemblies, rated from 100VA to 25 kVA, single or three phase.

Designed for installation in harsh locations, including plant rooms, workshops, road and rail locations, dockyards, water treatment works, etc. TH series transformers are available in a wide range of power ratings and voltage ratios and can incorporate a variety of fitments including MCBs, RCDs, Fusegear, Sockets and Isolators.

Fabricated from 1.5mm or 2.0mm sheet steel, enclosures are of seam welded construction and, as standard, incorporate wall mounting and floor mounting brackets.

IP Ratings
Standard IP ratings are vented to IP21 or non-vented to IP44.
Non-Standard IP ratings are vented to IP23 or non-vented to IP55.

The standard finish is a zinc phosphate pre-treatment to BS3189 followed by polyester powder topcoat, shade Dark Admiralty Grey. The standard finish provides corrosion protection for approximately 10 years when the equipment is installed outdoors in a normal pollution environment. For locations with a high level of pollution (acid rain, chemically laden atmosphere, etc) non-standard finishes are available including hot dip galvanized to BS729 or flame sprayed with zinc to BS2569 followed by polyester powder coating, shade to reasonable choice. We are also able to fabricate enclosures from various grades of stainless steel for road tunnel, rail, food industry and pharmaceutical installations. We would be pleased to advise on the best corrosion protection for specific installation environments.

Continuously rated from 100VA to 25 kVA, single or three phase. Transformer windings are designed and manufactured in accordance with BS EN 61558 Parts 1, 2-4, 2-6 and 2-23, where applicable.

Primary Voltages: 230 and 400 volts
Secondary Voltages: 12, 24, 25, 42, 50, 110 and 230 volts

BS7671:2018 permits a supply voltage tolerance of -6% to +10%. Any variation in the voltage connected to the primary of the transformer will proportionally vary the secondary voltage and also alter the inrush current characteristics. To address the impact of supply voltage variations, voltage tappings can be incorporated into the primary winding. We would be pleased to quote for transformers with primary tappings.

Transformers with dual secondary windings are available to feed a power tool at 110 volts and an inspection lamp at 24 volts. The required earthing arrangement of all secondary windings must be specified.

TH series transformers can be fitted with a wide variety of MCBs, RCDs, Fusegear, Sockets and Isolators. Our Customer Service Centres would be pleased to quote prices against specific requirements

Product Downloads

Data Sheets


On Application

This product cannot currently be purchased online. Please contact Blakley Electrics Customer Services on 0333 188 0284 to discuss your requirements and for pricing and lead times.

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