Protection Class; Degree Of Protection; A.1.9 Protection Class - Siemens SIMATIC S7 Functional Safety Manual

Technical specifications
A.1 General technical specifications
A.1.9

Protection class

Protection Class II according to EN 61131-2:
● S7-1200 is open equipment and must be enclosed in additional protection as described in
Section 4.1.2: "Guidelines for installing S7-1200 Fail-Safe devices" (Page 80).
● S7-1200 systems including AC power supply or relays which can be connected to AC
voltage achieve Class II when installed in a suitable enclosure.
● S7-1200 systems including only connections to SELV / PELV achieve Class III when
installed in a suitable enclosure.
● You do not require a protective conductor. The S7-1200 has no protective ground
connection.
A.1.10

Degree of protection

● 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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S7-1200 Functional Safety Manual
Manual, 02/2015, A5E03470344-AA