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4.1.8
Service Conditions
The protection device is designed for installation in normal relay rooms and plants, so that electromagnetic compati-
bility (EMC) is ensured if installation is done properly.
In addition, the following are recommended:
• All contactors and relays that operate in the same cubicle, cabinet, or relay panel as the numerical protective device
should, as a rule, be equipped with suitable surge suppression components.
• For substations with operating voltages of 100 kV and above, all external cables should be shielded with a conduc-
tive shield earthed at both ends. For substations with lower operating voltages, no special measures are normally
required.
• Do not withdraw or insert individual modules while the protective device is energized. In withdrawn condition, some
components are electrostatically endangered; during handling the ESD standards (for Electrostatic Sensitive De-
vices) must be observed. The modules and device are not endangered when inserted into the housing.
4.1.9
Design
Housing
Dimensions
Device
7ST6 1
7ST6 3
Protection class acc. to IEC 60529
For surface mounting housing equipment
in flush-mounted case
Front
Rear
For personal protection
UL-certification conditions
7ST6 Manual
E50417-G1176-C251-A3
7XP20
See dimensional drawings, Section 4.17
Housing
In flush mounting housing
In flush mounting housing
Size
1
/
2
1
/
1
IP 51
IP 51
IP 50
IP 2x with cover
„For use on a Flat Surface of a Type 1 Enclosure"
4.1 General
Weight (mass)
6 kg (13.2 lb.)
10 kg (22 lb.)
265
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