Specifications

AS-Interface slaves
Contactors and contactor assemblies — Power contactors for switching motors
SIRIUS 3RT20 contactors
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Siemens IK PI · 2012
6
■ Overview
Contactors with communication interface,
sizes S00 and S0
Contactor versions with a communication interface are required
for the connection to the controller via IO-Link or AS-Interface.
The connection is made via function modules, which are
mounted on to the front side of the contactors.
Contactors with communication interface in size S00 with spring-type
terminals and 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 tested and suitable 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.
The 3RT2 contactors are finger-safe according to EN 50274.
The contactors are suitable for screw fixing or for mounting on
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 more information about short-circuit protection of contactors
without overload relay, see Technical Specifications.
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 re-
lays can be fitted to the 3RT2 contactors for protection against
overload. The overload relays must be ordered separately.
Ratings of induction motors
The quoted rating (in kW) refers to the output power on the motor
shaft (according to the nameplate).
Control supply voltage
The contactors with communication interface are available with
24 V DC operation.
Note:
The selection and ordering data for 3RT10 contactors and
3RA23 reversing contactor assemblies with communication
interface can be found in chapter 7, "IO-Link".
Note:
Further technical information is available at
www.siemens.com/industrial-controls/support
under Product List:
- Technical specifications
under Entry List:
- Updates
- Downloads
-FAQ
- Manuals/operating instructions
- Characteristic curves
- Certificates
and at
www.siemens.com/industrial-controls/configurators
- Configurators
Kap_06_en.book Seite 74 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011