Siemens SIMATIC S7 System Manual page 682

Technical specifications
A.1 General specifications
Insulation
The insulation is designed in accordance with the requirements of EN 61131-2.
Note
For modules with 24 V DC supply voltage, the electrical isolation is designed for max. 60 V
AC / 75 V DC and basic insulation is designed according to EN 61131-2.
Contamination level/overvoltage category according to IEC 61131-2
● Pollution degree 2
● Overvoltage category: II
Protection class in accordance with IEC 61131-2
● Protection Class II according to EN 61131-2 (Protective conductor not required)
Degree of protection IP20
● IP20 Mechanical Protection, EN 60529
● Protects against finger contact with high voltage as tested by standard probe. External
protection required for dust, dirt, water and foreign objects of < 12.5mm in diameter.
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System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART