General Technical Specifications
1-12
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
1.5 Information on Insulation Tests, Protection Class and Degree of
Protection
Test voltages
Insulation stability must be demonstrated in the type test with the following test
voltages in accordance with IEC 61131-2:
Table 1-8 Test Voltages
Circuits with rated voltage U
e
to other
circuits or to ground
Test Voltage
< 50 V 500 VDC
< 150 V 2500 VDC
< 250 V DC 4000 V
Protection class
Protection Class I according to IEC 60536 – in other words, protective conductor
connection to rail necessary
Protection against ingress of foreign bodies and water
Degree of protection IP 20 according to IEC 60529, that is, protection against
contact with standard probes.
There is no special protection against the ingress of water.
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