Current Transformers


The latest current transformers from Crompton Instruments and Smart Process & Controls make it possible to measure high current values and indicate these using instruments of a much lower rating. Owing to high costs in cable we recommend the use of a Current Transformer for the current measurement above 40A (unless otherwise specified). When choosing a current transformer it is important to not only check the dimensions are suitable but also to check the accuracy class and burden required. You will need to also consider the length of cable between the instrument and CT; size of the cable and the burden required which the instrument will consume. In retro-fit applications it is possible to use a Split Core Current Transformer as it is easier and faster to install. These also come in various sizes and current ratings. We have also developed the Three Phase Current Transformers with plug in connectors for fast installation. Our Single Phase Solid Core Current Transformers come in various different shapes and sizes to cater for most busbar or cable dimensions.


Product Compare (0)


Crompton Instruments - MSC3 Miniature Split Core Current Transformer (250-500A)

Crompton Instruments - MSC3 Miniature Split Core Current Transformer (250-500A)

Product Features: | Split Core | Safety Shorting Fuse | 28mm² Aperture | 300-500A Primary Current | 1m Fly Lead (2.5mm Wire) | Accuracy Class 1 | DIN Rail ...

£27.80

Crompton Instruments - M3N1-25 Three Phase Current Transformer (60-160A)

Crompton Instruments - M3N1-25 Three Phase Current Transformer (60-160A)

Product Features:14.5mm x 24.5mm Aperture60-160A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or 3Busbar ...

£27.80

Smart Process - CT325 Three Phase Current Transformer (60-200A)

Smart Process - CT325 Three Phase Current Transformer (60-200A)

Product Features:14.5mm x 24.5mm Aperture60-160A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or 3Busbar ...

£23.50

Crompton Instruments - M3N1-35 Three Phase Current Transformer (100-250A)

Crompton Instruments - M3N1-35 Three Phase Current Transformer (100-250A)

Product Features:35mm Centres20.5mm x 24.5mm Aperture100-250A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or ...

£24.70

Smart Process - CT335 Three Phase Current Transformer (100-250A)

Smart Process - CT335 Three Phase Current Transformer (100-250A)

Product Features:35mm Centres21mm x 25mm Aperture100-250A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or ...

£21.50

Crompton Instruments - M3N1-45 Three Phase Current Transformer (250-600A)

Crompton Instruments - M3N1-45 Three Phase Current Transformer (250-600A)

Product Features:30.5mm x 30.5mm Aperture250-600A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or 3Busbar ...

£27.80

Smart Process - CT345 Three Phase Current Transformer (250-600A)

Smart Process - CT345 Three Phase Current Transformer (250-600A)

Product Features:45mm Centres31mm x 31mm Aperture250-600A Primary CurrentSecondary M4 Screw TerminalsAccuracy Class 0.5, 1 or ...

£23.50

Crompton Instruments - QC3N1-25 Three Phase Plug In Current Transformer (60-160A)

Crompton Instruments - QC3N1-25 Three Phase Plug In Current Transformer (60-160A)

Product Features:14.5mm x 24.5mm Aperture60-160A Primary CurrentQuick2Connect Plug In TerminalsAccuracy Class 0.5, 1 or 3Busbar ...

£25.00

Crompton Instruments - QC3N1-35 Three Phase Plug In Current Transformer (100-250A)

Crompton Instruments - QC3N1-35 Three Phase Plug In Current Transformer (100-250A)

Product Features:21mm x 25mm Aperture100-250A Primary CurrentQuick2Connect Plug In TerminalsAccuracy Class 0.5, 1 or 3Busbar ...

£22.00

Smart Process - SCT19 0.33VAC Miniature Split Core Current Transformer (5-150A)

Smart Process - SCT19 0.33VAC Miniature Split Core Current Transformer (5-150A)

Product Features: | Split Core | 19mm x 19mm Aperture | 100-200A Primary Current | 1m Fly Lead (2.5mm Wire) | Accuracy Class 1 | The SCT19 ...

£21.00 £35.00

Smart Process - SCT32 0.33VAC Miniature Split Core Current Transformer (400-600A)

Smart Process - SCT32 0.33VAC Miniature Split Core Current Transformer (400-600A)

Product Features: | Split Core | 32mm x 32mm Aperture | 400-600A Primary Current | 1m Fly Lead (2.5mm Wire) | Accuracy Class 1 | The SCT32 ...

£27.00 £42.00

CT75RJ12 Three Phase Current Transformer (60-160A)

CT75RJ12 Three Phase Current Transformer (60-160A)

Product Features:Made in the UK3x 30 x 15.5mm Aperture60-160A Primary CurrentAccuracy Class 0.5,RJ12 ConnectionBusbar or ...

£26.00

CT105RJ12 Three Phase Current Transformer (100-200A)

CT105RJ12 Three Phase Current Transformer (100-200A)

Product Features:Made in the UK3x 21 x 25mm Aperture100-200A Primary CurrentAccuracy Class 0.5,RJ12 ConnectionBusbar or ...

£24.00

CT140RJ12 Three Phase Current Transformer (250-630A)

CT140RJ12 Three Phase Current Transformer (250-630A)

Product Features:Made in the UK3x 31 x 31mm Aperture100-200A Primary CurrentAccuracy Class 0.5,RJ12 ConnectionBusbar or ...

£28.00

Smart Process - SMARTConnect CT335-SC Three Phase Current Transformer (60-250A)

Smart Process - SMARTConnect CT335-SC Three Phase Current Transformer (60-250A)

The CT3355-SC is a new design moulded case three phase CT with built in plugable connectors ...

£18.95

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