Current transformers

Current transformers are indispensable in many places.

A current transformer is a transducer which changes a high primary current into a more easily processable electrical signal. It transforms a high alternating current into a galvanically isolated alternating current of 5 amps or 1 amp. This is achieved by the electromagnetic principle of operation of the current transformer and serves the subsequent further processing of the alternating current. So if you need to process and measure alternating currents in your company, the use of  a current transformer is indispensable. However this is not the only place where current transformers are used. By far the most important area of application is energy management and thus the power network itself as well. It is therefore clear that nowadays one would hardly be able to manage without current transformers. So put your trust in Müller + Ziegler – a company with more than 100 years’ experience in the manufacture of electrical measuring instruments.

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Measuring transducers

Mains and limit monitoring

Energy meters

Panel meters digital

Panel meters analog

Measuring instruments for top hat rail mounting

Universal measuring instruments

Current transformers

Shunts

Portable testing devices

All

ASRD 14

Three-phase CT sets for round conductors Ø 13,5 mm

ASRD 205.37

Three-phase CT sets for busbars 20 x 5 mm or round conductors Ø 18 mm

ASRD 310.37

Three-phase CT sets for busbars 30 x 10 mm or round conductors Ø 22 mm

RSW 14

Tube unit current transformers for round condutors Ø 14 mm

RSW 21

Tube unit current transformers for round condutors Ø 21 mm

SW-S 2010

Plug-in current transformers for busbars 20 x 10 mm or round condutors Ø 19,2 mm

SW 2010

Plug-in current transformers for busbars 20 x 10 mm or round condutors Ø 20 mm

SW-S 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 26 mm

SW 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 28 mm

SW-L 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 28 mm

SW-K 3010

Plug-in current transformers for busbars PL 30 x 10 mm or round condutors Ø 28 mm

SW-S 4010

Plug-in current transformers for busbars PL 40 x 12 mm or round condutors Ø 26 mm

SW 4010

Plug-in current transformers for busbars PL 40x10 mm, 2x30x5 mm or round condutors Ø 32 mm

SW-L 4010

Plug-in current transformers for busbars PL 40x10 mm, 2x30x5 mm or round condutors Ø 32 mm

SW-S 5010

Plug-in current transformers for busbars PL 50x12 mm, 2x40x10 mm or round condutors Ø 44 mm

SW 5010

Plug-in current transformers for busbars PL 60x10 mm, 30x40 mm, 2x50x10 mm or round condutors Ø 44 mm

SW 6010

Plug-in current transformers for busbars PL 63x10 mm, 2x50x10 mm or round condutors Ø 44 mm

SW 6030

Plug-in current transformers for busbars PL 60x30 mm, 50x40 mm or round condutors Ø 44 mm

SW 8010

Plug-in current transformers for busbars PL 80x10 mm, 60x30 mm, 2x60x10 mm or round condutors Ø 55 mm

SW 10010

Plug-in current transformers for busbars PL 100x10 mm, 2x80x10 mm or round condutors Ø 70 mm

SW 10055

Plug-in current transformers for busbars PL 100x55 mm or round condutors Ø 55 mm

SW 20010

Plug-in current transformers for busbars PL 2x100x10 mm, 3x80x10 mm or round condutors Ø 85 mm

SW 12330

Plug-in current transformers for busbars PL 123x30 mm, 3x100x10 mm or round condutors Ø 100 mm

SW 12838

Plug-in current transformers for busbars PL 128x38 mm

WSWK

Wound primary CT for direct connection

WSWK-N

Wound primary CT for direct connection

WSWS

Wound primary CT for direct connection

SSW 2 bis SSW 3

Summary current transformers for 2 to 3 primary circuits

SSW 4 bis SSW 8

Summary current transformers for 4 to 8 primary circuits

SWU 18

Split core current transformers for round conductors Ø 18,5 mm

SWU 32

Split core current transformers for round conductors Ø 32,5 mm

SWU 2030

Split core current transformers for busbars 20 x 30 mm or round condutors Ø 20 mm

SWU 5080

Split core current transformers for busbars 50 x 80 mm or round condutors Ø 50 mm

SWU 80120

Split core current transformers for busbars 80 x 120 mm or round condutors Ø 80 mm

SWU 80160

Split core current transformers for busbars 80 x 160 mm or round condutors Ø 80 mm

CSW 31

Plug-in current transformers "Cage Clamp" for busbars 30 x 10 mm, 25 x 12 mm or round condutors Ø 25,7 mm

CSW 41

Plug-in current transformers "Cage Clamp" for busbars 40 x 10 mm, 30 x 15 mm or round condutors Ø 31,8 mm

CSW 51

Plug-in current transformers "Cage Clamp" for busbars 50 x 12 mm, 40 x 30 mm or round condutors Ø 43,7 mm

CSW 61

Plug-in current transformers "Cage Clamp" for busbars 63 x 10 mm, 50 x 30 mm or round condutors Ø 43,7 mm

CSW 81

Plug-in current transformers "Cage Clamp" for busbars 80 x 10 mm, 60 x 30 mm or round condutors Ø 54,7 mm

CSW 101

Plug-in current transformers "Cage Clamp" for busbars 100 x 10 mm, 80 x 30 mm or round condutors Ø 70 mm

Three-phase current transformer set

ASRD 14

Three-phase CT sets for round conductors Ø 13,5 mm

ASRD 205.37

Three-phase CT sets for busbars 20 x 5 mm or round conductors Ø 18 mm

ASRD 310.37

Three-phase CT sets for busbars 30 x 10 mm or round conductors Ø 22 mm

Tube-type current transformers

RSW 14

Tube unit current transformers for round condutors Ø 14 mm

RSW 21

Tube unit current transformers for round condutors Ø 21 mm

Clip-on current transformers

SW-S 2010

Plug-in current transformers for busbars 20 x 10 mm or round condutors Ø 19,2 mm

SW 2010

Plug-in current transformers for busbars 20 x 10 mm or round condutors Ø 20 mm

SW-S 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 26 mm

SW 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 28 mm

SW-L 3010

Plug-in current transformers for busbars PL 30 x 10 mm, 2x20x10 mm or round condutors Ø 28 mm

SW-K 3010

Plug-in current transformers for busbars PL 30 x 10 mm or round condutors Ø 28 mm

SW-S 4010

Plug-in current transformers for busbars PL 40 x 12 mm or round condutors Ø 26 mm

SW 4010

Plug-in current transformers for busbars PL 40x10 mm, 2x30x5 mm or round condutors Ø 32 mm

SW-L 4010

Plug-in current transformers for busbars PL 40x10 mm, 2x30x5 mm or round condutors Ø 32 mm

SW-S 5010

Plug-in current transformers for busbars PL 50x12 mm, 2x40x10 mm or round condutors Ø 44 mm

SW 5010

Plug-in current transformers for busbars PL 60x10 mm, 30x40 mm, 2x50x10 mm or round condutors Ø 44 mm

SW 6010

Plug-in current transformers for busbars PL 63x10 mm, 2x50x10 mm or round condutors Ø 44 mm

SW 6030

Plug-in current transformers for busbars PL 60x30 mm, 50x40 mm or round condutors Ø 44 mm

SW 8010

Plug-in current transformers for busbars PL 80x10 mm, 60x30 mm, 2x60x10 mm or round condutors Ø 55 mm

SW 10010

Plug-in current transformers for busbars PL 100x10 mm, 2x80x10 mm or round condutors Ø 70 mm

SW 10055

Plug-in current transformers for busbars PL 100x55 mm or round condutors Ø 55 mm

SW 20010

Plug-in current transformers for busbars PL 2x100x10 mm, 3x80x10 mm or round condutors Ø 85 mm

SW 12330

Plug-in current transformers for busbars PL 123x30 mm, 3x100x10 mm or round condutors Ø 100 mm

SW 12838

Plug-in current transformers for busbars PL 128x38 mm

Wound primary current transformers

WSWK

Wound primary CT for direct connection

WSWK-N

Wound primary CT for direct connection

WSWS

Wound primary CT for direct connection

Summation current transformers

SSW 2 bis SSW 3

Summary current transformers for 2 to 3 primary circuits

SSW 4 bis SSW 8

Summary current transformers for 4 to 8 primary circuits

Split-core current transformers

SWU 18

Split core current transformers for round conductors Ø 18,5 mm

SWU 32

Split core current transformers for round conductors Ø 32,5 mm

SWU 2030

Split core current transformers for busbars 20 x 30 mm or round condutors Ø 20 mm

SWU 5080

Split core current transformers for busbars 50 x 80 mm or round condutors Ø 50 mm

SWU 80120

Split core current transformers for busbars 80 x 120 mm or round condutors Ø 80 mm

SWU 80160

Split core current transformers for busbars 80 x 160 mm or round condutors Ø 80 mm

Clip-on "Cage Clamp" current transformers

CSW 31

Plug-in current transformers "Cage Clamp" for busbars 30 x 10 mm, 25 x 12 mm or round condutors Ø 25,7 mm

CSW 41

Plug-in current transformers "Cage Clamp" for busbars 40 x 10 mm, 30 x 15 mm or round condutors Ø 31,8 mm

CSW 51

Plug-in current transformers "Cage Clamp" for busbars 50 x 12 mm, 40 x 30 mm or round condutors Ø 43,7 mm

CSW 61

Plug-in current transformers "Cage Clamp" for busbars 63 x 10 mm, 50 x 30 mm or round condutors Ø 43,7 mm

CSW 81

Plug-in current transformers "Cage Clamp" for busbars 80 x 10 mm, 60 x 30 mm or round condutors Ø 54,7 mm

CSW 101

Plug-in current transformers "Cage Clamp" for busbars 100 x 10 mm, 80 x 30 mm or round condutors Ø 70 mm

Müller + Ziegler offers tailored solutions for your current transformer needs too.

Our numerous products include current transformers of accuracy classes 1 and 0,5. However, if you require  current transformers of  higher accuracy classes, this is possible without any problems, on request. We have specialised in developing tailored solutions to satisfy individual customer wishes. Thus, not only are current transformers of higher accuracy classes but also certified transformers or models for DIN rail mounting are available on request. The rated power available at the secondary terminals is stated in VA. The choice of rated power as well as the measuring range itself are determined by the consumption of the particular meter that is connected to the current transformer, including the feeder. The loss that arises due to the feeder is dependent on its length. Hence particularly high losses arise in the case of a long feeder and secondary currents of 5A. If the length of the feeder cannot be altered, current transformers with a 1A rating are recommended to minimise the loss that arises.

Diverse current transformers from our wide product range

We are able to offer you a wide choice of current transformers for diverse purposes. Besides straight-through current transformers we can also supply wound primary current transformers, summation current transformers and split-core current transformers. Which model of the respective category is best suited for use in your company is dependent on numerous factors. In general it should be borne in mind that with straight-through current transformers with a lower transformation ratio, the output power in VA falls as well. Through repeated passage of the primary conductor, a smaller ratio can be achieved for unaltered output power (VA).
When using the current transformer always be aware that hazardous voltages may be present on exposed secondary terminals and therefore “exposed working” should be avoided without fail.

Current transformers and much more – Müller + Ziegler is your point of contact for all types of electrical meters

In addition to diverse current transformer models, we also offer a large choice of other products which are ideally suitable for use in switchgear, machine and control engineering, the wind power industry and automation technology. From diverse meters such as analogue or digital panel meters or Universal meters through to Energy meters you can obtain all of the electrical measuring equipment your company needs from us. As our customer, we give priority to your individual requirements. We look forward to receiving your enquiry!

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