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Your advantages in detail

Saves space and time – current transformer quick-action mechanism

The quick-action mechanism allows your PACT current transformers to be installed quickly and securely on the power rail. To do this, simply position the holding latch of the quick-action mechanism in the guide slot on the transformer. Two fixing pins ensure a tight hold.

Tool-free mounting with the transformer quick-action mechanism offers the following advantages:

  • The transformers can also be mounted by hand in areas where a screwdriver does not fit.
  • The quick-latching mechanism is integrated in the fixing pins, which means that the assembly time does not depend on the screw-in depth, i.e., the distance between the holding latch and power rail.
  • The ends of the fixing pins press into the power rail by just tightening slightly. This simplifies alignment, especially in the case of a 3-phase supply.
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Variable and space-saving mounting

Variable mounting options  

Variable mounting options

In addition to the vertical and horizontal mounting position, the optional accessories offer further installation options:

  • On the DIN rail using the snap-on DIN rail adapter
  • On the control cabinet panel using insertable mounting feet

All PACT current transformers are just 30 mm wide. If you are short of space, simply mount the transformer horizontally on the power rail. This saves space – for example when measuring branch outlets of the main supplying rail.

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Safe isolation according to EN 50178

Safe isolation – with current transformers  

Safe isolation – with PACT current transformers

PACT current transformers offer safe isolation according to standard EN 50178. This is relevant for electronic equipment for use in power installations.

EN 50178 differs considerably from EN 60044, the usual standard for transformers, with regard to safety:

  • Greater air and creepage distances
  • Higher test voltage

With PACT current transformers you can be sure that there is no sparkover on the secondary side of the transformer. Human life is protected inside and outside the control cabinet.

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Operating voltage comparison

EN 50178 prescribes significantly higher impulse withstand voltages for transformer testing. When testing according to EN 60044, these requirements are no longer met from a rated insulation voltage of 480 V (L-L) upwards. PACT current transformers have significantly greater air and creepage distances and are individually tested with 12 kV. This ensures increased safety.

In EN 50178, the specified voltage relates to the phase/neutral conductor, which means that in this case the rated insulation voltage of a typical 720 V transformer is only 416 V (L-N). In system applications, PACT current transformers even support use up to 1000 V (L-N).

 EN 60044-1
(standard for transformers)
EN 50178
(for power installations)

Rated insulation voltages

(operating voltage)

480 V (L-L)
720 V (L-L)
1000 V (L-L)
277 V (L-N)
416 V (L-N)
577 V (L-N)
1000 (L-N) PACT

Impulse withstand voltage for transformer testing

  • At 277 V (L-N)
  • At 1000 V (L-N)


3 kV

3 kV


6 kV

12 kV PACT

Safe detection of current peaks

Peak capture  

PACT current transformers detect current peaks reliably

PACT current transformers can be used to safely detect current peaks greater than the rated nominal current strength – without resulting in any damage.

This is due to the fact that PACT current transformers are designed for a continuous nominal current that is 120% of the primary rated current strength. This means that for a rated current that is 1.2 times greater, a PACT current transformer with a specified rated power of 10 VA does indeed deliver 14.4 VA – and on a continual basis.

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Safe connection technology

Safe connection technology  

PACT current transformers offer safe connection technology

The connection technology for PACT current transformers from Phoenix Contact is based on the "elevator principle": when the screw is turned, a metal plate moves upwards, safely clamping the conductor.

This provides many advantages:

  • No damage to the conductor, since direct screw contact is possible, as the conductor is held by the metal plate.
  • Low contact resistance due to the large clamping surfaces.
  • Durable connection, since the strong pressure forces compress the fine-core conductors tightly preventing any corrosive gases from penetrating.

Furthermore, the current transformer can also be connected laterally using a fork-type cable lug when mounted horizontally.

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Further information

SEA Pte. Ltd.

105 Eunos Avenue 3
Singapore 409836
+65 6228 4900