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Conformal coating – As standard

Conformal coating – As standard
Conformal coating – As standard
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Product Code : GP_3
Product Description

Conformal coating As standard

Highest availability even in harsh environments

The term "conformal coating" refers to the coating of electronic modules. This coating provides protection against extreme moisture, corrosive gases and aggressive dust, or combinations thereof.Furthermore, the coating layer also offers mechanical protection against in appropriate handling and external influences. Conformal coating extends thelifetime of your devices in case of harsh environments.


SIPROTEC devices already feature a high degree of availability and long lifetime, even without additional coating. This is demonstrated by more than 1.6 million devices in operation worldwide. During the phase of product design, highest priority is given to fulfilling the relevant product standards, and compliance is proven by type tests, e.g. damp heat cycletests according to IEC 60068-2-30, involving exposure to mixed gases, sulfurdioxide SO2 or hydrogen sulfide H2S.

The new coating feature provides an additional level ofprotection for SIPROTEC devices used in extremely harsh environmentalconditions, such as:

  • H2S gas, which is present in certain industrial environments and may impair SMD components already at concentrations of 10 ppm
  • Constant exposure to silver sulfide, which can lead to so-called "silver whiskers" on the surface of SMD components
  • These negative influences may be even aggravated by high air humidity

In extreme cases, these influences may cause short-circuits or circuit breaks on the board and lead to restricted device functionality or failure.

Qualified production process

  • The conformal coating of SIPROTEC device PCBs iscarried out in an established, high quality process.
  • In this process, the PCBs undergo an automated coating with a coating roboter and afterwards a hardening of the coating.


Type testing of coated PCBs

  • SIPROTEC protection and automation devices aretested and approved by independent and accredited test laboratories.
  • In this process, the SIPROTEC device is subjected to severaltest complexes.
  • In the course of test complex A, for example, the device isfirst exposed to corrosive gases and afterwards to damp heat. In contrast tosingle tests with different specimen, this combined approach simulates maximumharsh environmental conditions.


Test complex A:
Corrosive and climatic tests

  • Corrosive gas SO2, acc. to IEC 60068-2-42
  • Corrosive gas H2S, acc. to IEC 60068-2-43
  • Mixed corrosive gases, acc. to IEC 60068-2-60
  • Corrosion test with mixed gas, in accordance with ISA 71.04:2013-08, G3 (Harsh) (SIPROTEC 5)
  • Damp heat, cyclic, acc. to IEC 60068-2-30 and LR test specification $14

Test complex B:
Climatic and mechanical-dynamic tests

  • Temperature: +55 °C continuous, +70 °C for 96 h
  • Fast temperature change cycles -40 °C <-> +85 °C
    acc. to IEC 60068-2-14
  • Vibration and shock stress,
    acc. to IEC 60068-2-6, 60255-21-1
  • Damp heat, cyclic,
    acc. to IEC 60068-2-30

Test complex C:
Hygroscopic dust

  • Dust and sand, Arizona test dust, duration 24 h, in accordance with IEC 60068-2-68
  • Damp heat, cyclic,
    acc. to IEC 60068-2-30

Test complex D: Salt mist test

  • Additional specific tests to simulate “Offshore”conditions
  • Salt mist IEC 60068-2-52, test Kb with increased parameters acc. Lloyds Register Specification

SIPROTEC devices with conformal coating

  • 7SJ80, 7SJ81, 7SK80, 7SK81, 7SD80, 7RW80


  • 7SJ82, 7SK82, 7SA82, 7SD82, 7SL82, 7UT82
  • 6MD85, 6MD86, 7SJ85, 7SJ86, 7SK85, 7SA86, 7SA87, 7SD86, 7SD87, 7SL86, 7SL87, 7UT85, 7UT86, 7UT87, 7VK87, 7UM85, 7VE85, 7KE85, 7SS85


  • Highest lifetime and high availability of SIPROTEC deviceseven under extreme environmental conditions
  • Increased protection against harmful environmentalinfluences such as corrosive gases and salts
  • Additional mechanical protection against dust, abrasion andinsects
  • Reliable prevention of the formation of"dendrites" between components
  • Increased protection of the PCBs against moisture
  • Highest coating quality by means of a qualified production process


Office No.-9, Plot 53/54, Sector-34, Space Heights, Near Tawa Hotel, Kamothe, Navi Mumbai - 410209, Maharashtra, India
Mr Piyush Lalchand Rathi (Partner)
Mobile :+919819614841, +919769207841
Mr. Dnyanesh Gawande (Partner)
Mobile :+919833686249