Bespoke Industrial Transformers

OT Series Open Type Transformers



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Open type transformers for panel mounting, etc., rated up to 25kVA, single or three phase, 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.

Open type transformer windings, rated from 100VA to 25 kVA, single or three phase.

For incorporation by OEMs within Switchboards, Control Panels or other assemblies requiring isolation from the mains or special voltages for functional or safety reasons.

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 and 2-6, as applicable.

Primary Voltages – 110, 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 and / or secondary tappings. The earth connection of secondary windings must also be specified i.e. Earth Free, Centre Tapped to Earth, Neutral Earthed, etc.

As standard, OT series transformers have screw type terminals, shrouded to IP2X. Alternatively, flexible flying leads can be supplied for terminating within the customer’s equipment.

OT series transformers incorporate basic mounting frames. Special mounting arrangements can be provided as required.

Weights and Dimensions
Our Customer Service Centres would be pleased to quote weights and dimensions against specific enquiries.

Please forward your enquiries to our Customer Service Centres who will be pleased to deal with your inquiry.

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.