3Rt Power Contactors - Siemens SIRIUS 3RT Manual

Configuration
6.4 Application environment
6.4.2

3RT power contactors

The following information must be taken into account when planning applications involving
3RT power contactors.
Resistance to extreme climates
3RT power contactors are suitable for use in any climate.
Shock load and vibratory load
The 3RT contactors have been tested in terms of their shock resistance to sine pulses and
rectangular pulses for AC and DC operation.
Ambient temperature
The 3RT2 contactors are dimensioned as standard for operation at ambient temperatures of
between -25 °C and +60 °C. Up to 60 °C, side-by-side mounting can be used without any
restriction. The devices can be stored at temperatures within the range from
-55 °C to +80 °C.
The 3RT1 contactors are designed for use in ambient temperatures from -25 °C to +60 °C.
Special versions can be used from -35 °C to +70 °C.
Extended ambient temperature
Contactors can be used at higher ambient temperatures, but various constraints must be
considered. The 3RT20 contactors can be operated continuously at an ambient temperature
of T
Thermal load capacity of the main current paths
The standard contactors are dimensioned for a maximum ambient temperature of
T = 60 °C. In order to use the contactors at higher ambient temperatures of up to 70 °C, the
a
rated operational current I
The following linear dependencies can be applied here:
I max., T
e
I /AC-1 or I
e
T =
a
90
> 60 °C, taking the following points into account:
a
/AC-1 or I
e
= Rated operational current of the contactor at increased ambient
a
temperature, to be calculated
/DC-1 = Rated operational current of the contactor for respective utilization
e
category and T
Actual ambient temperature T
/DC-1 and the switching frequency z must be reduced.
e
≤ 60 °C
a
> 60 °C
a
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006