Feature: Power
the necessary tests for liquid splashing but has not been evaluated for the intrusion of foreign objects.
Which IP ratings does PULS off er for its power supplies? PULS off ers a variety of power supplies with the IP ratings described above. T e products can be divided into two categories: In the light of the increasing trend for
Table 2
decentralisation, the IP rating of industrial power supplies now plays a more important role than it did a few years ago. T e DC supply is very oſt en installed directly on the machines, outside the protective cabinet. To ensure the safety of employees and the correct functioning of the power supply, IP54 is required as a minimum across all system components (e.g., SPS, HMI, sensors etc.). For these applications, PULS has
developed the fi eld power supplies in the FIEPOS product family .
Table 3
and insulation of power supplies with the aim of protecting users from electric shocks. Table 1 gives an overview of the meaning of the numbers of the diff erent IP ratings:
Which IP ratings are frequently applied to industrial power supplies? T e IP rating required depends on the installation site and the environmental conditions in each case. Power supply manufacturers that supply products to their customers ex stock generally only off er products with selected IP ratings that have become industry standards. Table 2 gives an overview of the most common IP ratings for industrial power supplies. If diff erent combinations of protection
against contact and moisture are needed in special cases, customer-specifi c power supplies are oſt en the ideal solution.
What do codes such as IPX4 and IP6X mean? Electronic devices are oſt en tested in relation to only one of the two codes for foreign objects and liquids.
www.electronicsworld.co.uk February 2025 21 T e ‘X’ indicates that the product
has not been subjected to the corresponding tests for this code. T erefore, this is not a variable that can simply be replaced by any of the values from the table of IP ratings. A power supply with the code IP6X
off ers full protection against contact and is dust-tight but has not been tested for liquids intrusion. In a similar way, a power supply with the code IPX4 has undergone
Summary T e IP rating describes how well a device is protected against accidental contact, foreign objects and liquids. T e majority of IP codes consist of two digits. T e fi rst digit represents the protection against accidental contact and foreign objects, while the second digit indicates the protection against liquids and moisture. T e higher the numbers, the greater the protection. Industrial power supplies that are used inside a cabinet normally have the rating IP20. Power supplies installed outside a protected environment should have a higher rating, e.g., IP54 or IP67.
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