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Siemens IK PI · 2015
AS-Interface
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Contactors and contactor assemblies
Power contactors for switching motors
> SIRIUS 3RT20 contactors
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Overview
Contactors with communication interface,
sizes S00 and S0
Contactor versions with communication interface are required
to establish a connection to the control system via IO-Link or
AS-Interface. The link is established by means of function
modules mounted on the front of the contactor.
Contactor size S00 with communication interface and spring-type
terminals and contactor size S0 with screw terminals
Standards
IEC 60947-1, EN 60947-1,
IEC 60947-4-1, EN 60947-4-1,
IEC 60947-5-1, EN 60947-5-1 (auxiliary switches)
The 3RT20 contactors for switching motors are climate-proof
and are suitable and tested for use worldwide.
If the devices are used in ambient conditions which deviate from
common industrial conditions (IEC 60721-3-3 "Stationary Use,
Weather-Protected"), information must be obtained about possi-
ble restrictions with regard to the reliability and endurance of the
device and possible protective measures. In this case contact
our Technical Assistance.
3RT2 contactors are finger-safe according to EN 50274.
The contactors are suitable for screw fixing or for mounting onto
TH 35 standard mounting rails according to IEC 60715.
Contact reliability
If voltages
110 V and currents
100 mA are to be switched,
the auxiliary contacts of the 3RT2 contactor or 3RH21 contactor
relay should be used as they guarantee a high level of contact
reliability.
These auxiliary contacts are suitable for solid-state circuits with
currents
1 mA at a voltage
17 V.
Connection methods
The 3RT2 contactors are available with screw terminals or
spring-type terminals.
Short-circuit protection of the contactors
For short-circuit protection of contactors without overload relays,
see Technical specifications (see Note).
To assemble fuseless motor feeders you must select combina-
tions of motor starter protector and contactor as explained in
"3RA2 Load Feeders".
Motor protection
3RU21 thermal overload relays or 3RB30 solid-state overload
relays can be fitted to the 3RT2 contactors for protection against
overload. The overload relays must be ordered separately.
Ratings of three-phase motors
The quoted rating (in kW) refers to the output power on the motor
shaft (according to the nameplate).
Control supply voltage
Contactors with communication interface are available with
24 V DC operation.
Note:
For selection and ordering data for 3RT20 contactors and 3RA23
reversing contactor assemblies with communication interface
see Chapter 5, "IO-Link".
Manuals and configurator
For more information, see
•
System manual "SIRIUS Innovations – System Overview",
•
Manual "SIRIUS Innovations – SIRIUS 3RT2 Contactors/
Contactor Assemblies",
Online configurator see
www.siemens.com/sirius/configurators
.
www.siemens.com/sirius/configurators
© Siemens AG 2014