Protective conductor continuity test units 90-4F

Protective conductor continuity testing on electrical equipment

The test units – which are available in various models to suit a range of use cases – enable versatile deployment options in manual or automated systems for protective conductor continuity testing on appliance class I electrical equipment. The test current is electronically controlled to enable testing with constant current.

  • 3 RU slide-in system
  • High-quality metal system module
  • Service-friendly – can be replaced in just a few steps

Test voltage

10 VAC

Measurement range

350 mΩ

Test current

25 A


Digital, analogue output

Line voltage

230 V +10/−5%; 49 … 61 Hz

Form factor

3 RU • 36 HP


6 kg  


Other interfaces on request

90-4F  E10

Ethernet instead of digital/analogue

90-4F  E11

Ethernet+RS232 instead of digital/analogue

90-4F  E12

USB instead of digital/analogue

  • 30-6M housing 3 RU/36 HP
  • 90-4F E99 factory calibration

We respect your privacy

We use cookies to offer you an ideal experience on our website. This includes cookies that are necessary to operate our web pages as well as cookies only used for anonymous statistical purposes, for user experience settings and for displaying customised content. You can decide which categories you want to allow. Please note that based on your settings, not all the functionalities of our site may be available.

Cookie settings


Without these cookies, the website cannot function correctly.


These cookies are used to analyse user behaviour on our website. They may count how often a user has visited the site or how long they spend on a certain web page.


These cookies are used to improve our website’s user experience. They may store whether you have already accessed a Google Maps map so that you won’t be shown our privacy statement again.