Control & Industrial Transformers, Single Phase 3kVA - 40kVA | CL Range

Larger single-phase Transformers using UI two limb construction.

The Transformers conform to IEC61558 and IEC60076 and are available with a range of voltage and connection options.

Control Transformer Class 1 Isolation Transformer with Earth Screen between Primary and Secondary
Standard IEC / BS-EN 61558
Primary Voltages To be specified
Secondary Voltages To be specified
Frequency 50/60Hz
Insulation Class B, F or H
Insulation Resistance > 5 Meg Ω
Dielectric Strength Primary to Secondary >2.5kV Primary to Earth >2.5kV Secondary to Earth >2.5kV
Ambient Temperature 40℃
3 Phase 40kVA Transformer Manufacturers UK

Transformer Circuit Protection

Transformers must be protected against short circuit and overload.

Primary Circuit

The primary side of the Transformer should be protected against short circuit thereby cutting the supply voltage in the event of a short circuit fault.

The rating of the primary protection device has to take into account the high inrush current during energizing of the Transformer.

The table below gives suggested protection values to avoid nuisance tripping on inrush.

Rating VA Primary Volts Amps Fuse Type C MCB Type D MCB Primary Volts Amps Fuse Type C MCB Type D MCB
3000 230 13.04 20 40 25 415 7.22 12 25 16
4000 230 17.39 25 63 32 415 9.63 16 40 20
5000 230 21.7 32 63 32 415 12.04 20 40 20
7500 230 32.60 50 63 32 415 18.07 32 40 25
10000 230 43.47 63 100 50 415 24.09 40 50 32
15000 230 65.21 110 63 415 36.14 63 40
20000 230 86.95 150 415 48.19 75 50
30000 230 130.43 200 415 72.28 110
40000 230 173.91 300 415 96.38 175

Secondary Circuit

The secondary circuit should be protected against short circuit and overload.

The value of the protection should be the same or less than the rated output current.

Part No. VA A B C D E Weight kg % Reg. Watts Loss Inrush VA For 10% Volt drop Inrush VA For 5% Volt drop
CL3000 200 115 275 160 85 20 3.4 160 11800 7400
CL4000 200 135 275 160 105 25 3.4 170 15700 9800
CL5000 240 140 390 200 100 40 3.1 180 25000 15000
CL7500 240 160 390 200 120 50 3.0 210 43000 25700
CL10000 280 230 440 240 130 70 2.9 254 50000 35000
CL15000 280 260 440 240 170 100 1.9 350
CL20000 320 320 490 280 200 130 1.9 560
CL30000 400 350 690 300 170 190 1.8 950
CL40000 400 350 690 300 180 225 1.8 1100

Purchasing

Boardman Transformers' core range of products are available to purchase through many of the leading UK and international distributors and we are always happy to provide details of where our transformers may be bought.

Should your requirements be of a more specialist or bespoke nature, we ask that you contact us directly to speak to a member of our team.

Download Product Specification