Product-specific safety information
2.4 General safety notes
3TK28 safety relays
Manual, 07/2016, NEB926157502000/RS-AB/003
11
Note
Safety category 4 per DIN EN 954-1 / SIL 3 per IEC 61508 / PL e per DIN EN ISO 13849-1
The 3TK28 safety relays have been designed such that applications up to category 4 per
DIN EN
954-1 / SIL 3 per IEC 61508 / PL e per DIN EN ISO 13849-1 can be implemented.
Protection against electrostatic charge
When handling and installing the 3TK safety relays, ensure that the components are
protected from being electrostatically charged. Changes to the system configuration and
wiring are only permissible while the supply voltage is switched off.
Connection of 3TK safety relays is only permissible when the power supply units (PELV
and SELV) are switched off.
Hazardous voltage
Will Cause Death, Serious Injury or Property Damage
Installing devices in control cabinets
Taking the ambient conditions into account, you must install the devices in control cabinets
with the IP32, IP43 or IP54 degree of protection.
The following must be grounded in accordance with the regulations to ensure noise
immunity of the 3TK28 safety relays:
• PELV / SELV power supplies (please also observe the documentation of the respective
power supply).
Note
Operational faults and malfunctions in communication
If the EMC Directive 2004/108/EC
is not complied with when plants and devices are
installed, communication breaks may occur.
Note
The 3TK28 devices are products for environment A. These devices can
cause unwanted
radio interference in residential environments. The user may be required to implement
appropriate measures in this case.
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