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3RT1/3RH1 contactors
SIRIUS System Manual
3-8
GWA 4NEB 430 0999-02b
Regulations
IEC 61 140 (replacing VDE 0106 Part 101/IEC 536) lists basic requirements
that can be met using safe isolation between circuits in electrical equip-
ment.
Basic requirements are, for example:
• Double or reinforced insulation
• Protective screening
• Combination of double or reinforced insulation and protective screening
The insulation must be resistant to aging throughout the expected service
life.
Circuits without protective extra-low voltage or functional extra-low voltage
do not require safe isolation.
Safe isolation in the
case of 3RT1 and 3RH1
contactors
If the conducting paths of a contactor are operated with different voltages,
the requirements for safe isolation must be met.
In the case of the 3RT1 and 3RH1 contactors, safe isolation is ensured up to
the following voltage:
• Safe isolation between the different main conducting paths is always
400 V.
• Safe isolation between the different main conducting paths and the coil
connection is always 400 V.
• The following table lists the values for safe isolation between the main
and auxiliary conducting paths and the coil connection:
Table 3-5: Safe isolation
(*) Only applies to 4-pole auxiliary switch blocks at the front
All the data are power system specifications with 10% overvoltage in volts
[V].
400 V + 10% corresponds to 415 V + 5% and 500 V + 10% corresponds to
525 V + 5%.
Attention
In the table, the voltage that can cause electric shock and that must be
safely isolated is critical. If the voltages 400 V and 24 V are to be safely iso-
lated from one another, contactors with safe isolation up to 400 V must be
used between the two points of connection used.
3RT1 and 3RH1 contactors
Frame size
S00
Main con-
tact
Frame size
S0
Main contact
Frame size
S2
Main contact
Frame size
S3
Main contact
Aux. switch
at front
at side
Coil connection
690 (*)
-
400
500
690
400
500
500
400
500
690
400
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