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¹⁾ Screw terminal optionally with box terminals or with bar connections.

Contactors with screw terminals: 3RT2 (sizes S00 to S3) and 3RT1 (sizes S6 to S12)

3RT contactors, sizes S00 to S12

Our power range:

• Contactors for switching motors:
  • Size S00: 3RT201 up to 7.5 kW
  • Size S0: 3RT202 up to 18.5 kW
  • Size S2: 3RT203 up to 37 kW
  • Size S3: 3RT204 up to 55 kW
  • Sizes S6 to S12: 3RT10 up to 250 kW
• Vacuum contactors for switching motors: see "SIRIUS 3RT12 and 3TF6 Vacuum Contactors":
  • Sizes S10 and S12: 3RT12 up to 250 kW
  • Size 14: 3TF6 up to 450 kW

Standards

IEC 60947-1, EN 60947-1,
IEC 60947-4-1, EN 60947-4-1,
IEC 60947-5-1, EN 60947-5-1 (auxiliary switch)

3RT contactors

The 3RT2 contactors 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 possible restrictions with regard to the reliability and endurance of the device and possible protective measures. In this case contact our Technical Assistance,
Tel.: +49 (911) 895-5900
E-mail: technical-assistance@siemens.com.

Auxiliary contact complement

• Size S00: an auxiliary contact is integrated in the basic device.
• Sizes S0 to S3: The basic units contain two integrated auxiliary contacts (1 NO + 1 NC).
  All basic units, with the exception of coupling relays S00 and S0, can be expanded using auxiliary switch blocks.
• Sizes S6 to S12: These contactors are supplied with two laterally mounted auxiliary switch blocks. The fitting of auxiliary switches is possible on the front and on the side (the 3RT12 vacuum contactor is an exception: only lateral fitting of auxiliary switches is possible here).

For detailed information on the fitting of auxiliary switches, see the asset "Selection guide for mountable auxiliary switch blocks" under "Accessories and Spare Parts" > "for SIRIUS 3RT2 Contactors and SIRIUS 3RH2 Contactor Relays" > “Auxiliary switch blocks" > "Instantaneous".

Contact reliability

If voltages ? 110 V and currents ? 100 mA are to be switched, the auxiliary contacts of the 3RT contactors or 3RH contactor relays 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 of ? 17 V and higher.

Connection method

Main circuit

• Sizes S00 and S0: screw or spring-type terminal, spring-type terminal with convenient plug-in design for device connectors
• Size S2: Screw terminals
• Sizes S3 to S12: screw terminal with or without box terminal; with the box terminal removed: connection with bar or cable lugs on the device connection bar possible

Auxiliary circuit

• Sizes S00 to S12: Screw or spring-type terminals

Electromagnetic compatibility (EMC)

The 3RT contactors fulfill the requirements for environment category A.

Note:

When the contactors are used in an environment with frequency converters, the information in the manuals must be observed, see topic "Technical specifications" > "More information".

Short-circuit protection

For short-circuit protection of the contactors without overload relay, see "Technical Specifications" of the relevant contactor.

Refer to the manuals for details of short-circuit protection of the contactors with overload relays; see above under "More information".

For the fuseless assembly of motor feeders consisting of a 3RV2 motor starter protector and a 3RT2 contactor, selection guides are available as described in "3RA2 Load Feeders"; see "Load Feeders and Motor Starters" > "for Use in the Control Cabinet".

Motor protection

3RT2 contactors

3RU2 thermal overload relays or 3RB3 electronic overload relays can be fitted to the 3RT2 contactors for protection against overload. For overload relays, see "Protection devices".

3RT1 contactors

3RB2 electronic overload relays can be fitted to the 3RT1 contactors for protection against overload. For overload relays, see "Protection devices".

Plant and application monitoring

3RR2 monitoring relays can be fitted to the 3RT2 contactors for monitoring and measuring in the application. See "Monitoring and Control Devices" > "Relays" > "SIRIUS 3RR21, 3RR22 Monitoring Relays for Mounting on 3RT2 Contactors".

Ratings of three-phase motors

The quoted rating (in kW) refers to the output power on the motor shaft (according to the nameplate).

The power rating specifications of the contactors in kW (in accordance with IEC 60947-4-1, Table G) are guide values for 4-pole standard motors at 50 Hz AC and specified voltage (e.g. 400 V AC). The actual starting and rated data of the motor to be switched must be considered when selecting the units.

Surge suppression

3RT contactors supplied without a coil circuit can be retrofitted with RC elements, varistors, diodes or diode assemblies (assembly of diode and Zener diode for short break times) for damping opening surges in the coil.

• Size S00: the surge suppressors are plugged onto the front of the contactors here. Space is provided for them next to a snap-on auxiliary switch block.
• Sizes S0 and S3: the surge suppressors can be plugged onto the front of the devices. In the case of size S3 contactors, surge suppressors can only be used as from product version E03.
• Sizes S6 to S12: withdrawable coils with integrated coil switch (varistor)

Note:

The OFF-delay of the NO contact and the ON-delay of the NC contact are increased if the contactor coils are attenuated against voltage peaks (for details see the relevant manual > topic "Technical specifications" > "More information").

Contactors with voltage tap-off

Sizes S00 to S3

The S00 to S3 contactors with voltage tap-off are special versions for mounting the SIRIUS function modules for connection to the control system through IO-Link or AS-Interface. See "Accessories and Spare Parts" > "for SIRIUS 3RT2 Contactors and SIRIUS 3RH2 Contactor Relays" > "Modules for Contactor Adaptation".

Without a function module, the contactors can be used like the standard versions.

For more information on IO-Link and AS-Interface see "Industrial Communication".

Control supply voltage

Different versions of operating mechanisms are available depending on the contactor size:

• AC or DC operation for sizes S00 to S3
• AC/DC operating mechanism for sizes S0 to S12 that can operate on AC (50 to 60 Hz) or DC.

Operating mechanism types

Sizes S6 to S12

Two types of solenoid operation are available:

• Conventional operating mechanisms
• Solid-state operating mechanism
  • The operating mechanism for the contactors features solid-state control of the contactor coil. Overvoltage damping of the operating mechanism coil is already integrated in the electronics. The operating mechanisms are powered via a supply voltage with an operating range from 0.7 to 1.25 x U_s, optionally also controlled depending on the chosen mode of operation. Alternatively, control is via the separate 24 V DC control signal input. Various rated voltage ranges for AC/DC control are available.
  • This version is additionally available with a 24 V DC PLC relay output and a remaining lifetime indicator (RLT).

Solenoid coils

• Sizes S0 to S3: coil replacement is possible.
• As from size S6: For simple coil replacement, e. g. if the application is replaced, the solenoid coil can be pulled out upwards after the release mechanism has been actuated and can be replaced by any other coil of the same size.

Article No. scheme

Note:

The Article No. scheme shows an overview of product versions for better understanding of the logic behind the article numbers.

For your orders please use the article numbers quoted in the ordering data.