SIEMENS 西门子SIRIUS 3RT contactors, 3-pole, up to 250 kW

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/EN 60947‑1, 
IEC/EN 60947‑4‑1, 
IEC/EN 60947‑5‑1 (auxiliary switches)

Ambient conditions

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 Support: https://support.industry.siemens.com/My/ww/en/requests

Auxiliary contact complement

• Size S00: An auxiliary contact is integrated in the basic unit.

• 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 sizes 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 about fitting of auxiliary switches, see Selection guide for mountable auxiliary switch blocks→ Assets.

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 especially suitable for solid-state circuits with currents ≥ 1 mA at a voltage of 17 V and higher.

Connection methods

Main circuit

• Sizes S00 and S0: screw or spring-type terminals, spring-type terminals with convenient plug-in design for device connectors

• Sizes S2 and S3: screw terminals with box terminal; direct connection to the connecting bar possible with cable lugs for S3 when the box terminal is removed.

• Sizes S6 to S12: screw terminals with connecting bars that the cables can be connected to using either cable lugs or flexible or rigid busbars. Alternatively, box terminals are available as accessories.

Auxiliary/control 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 configuration notes in the Manual must be observed, see Manual.

Short-circuit protection

For short-circuit protection of contactors without overload relays, see the product data sheet of the relevant contactor.

Refer to the configuration manuals for details of short-circuit protection of contactors with overload relays or of load feeders, see Technical Specifications.

For fuseless assembly of motor feeders consisting of 3RV2 motor starter protector and 3RT2 contactor, selection guides are available, see SIRIUS 3RA2 load feeders.

Motor protection

3RT2 contactors

3RU2 thermal overload relays or 3RB3 electronic overload relays can be fitted to the 3RT2 contactors for protection against overload.

3RT1 contactors

3RB2 electronic overload relays can be fitted to the 3RT1 contactors for protection against overload.

Plant and application monitoring

For monitoring and measuring in the application, 3RR2 monitoring relays can be fitted to the 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. The motor current, motor protection device and the permissible contactor current according to the utilization category must be aligned with each other.

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: replaceable operating mechanisms with integrated coil circuit (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 → Technical specifications).

Contactors with voltage tap-off

3RT2 contactors

The 3RT2 contactors in sizes S00 to S3 with voltage tap-off are special versions for mounting the SIRIUS 3RA27 function modules for connection to the control system through IO‑Link or AS‑Interface.

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.

Operating mechanism types

3RT2 contactors

3RT2 contactors are available as standard versions with AC or DC operating mechanisms or as versions with a wide-range solid-state operating mechanism and a universal actuating voltage (AC or DC operation possible).

DC coupling contactors with reduced power consumption are also ideally suited for connection to the controller.

With an operating range between 0.8 to 1.1 x Us, control takes place via the control supply voltage connection A1 - A2 as is typically the case.

3RT1 contactors

The following control and/or operating mechanism versions are available in sizes S6 to S12:

• Standard operating mechanism with economy circuit for AC and DC operation (switchover from closing coil to holding coil)

• Solid-state operating mechanism 
  Overvoltage damping of the operating mechanism coil is already integrated in the electronics for contactors with solid state operating mechanisms. The operating mechanisms are powered via a supply voltage with an operating range from 0.8 to 1.1 x Us, optionally also controlled depending on the chosen mode of operation. Alternatively, control is also possible via the separate 24 V DC control signal input. Various rated voltage ranges for AC/DC control are available.
  
  The following versions are available:

• With two operating modes: Direct control or via CPU input

• As above, but additionally with remaining lifetime indication (RLT)

• With fail-safe PLC input for simplification of safety applications (without mode of operation selection)

Solenoid coils/operating mechanisms

3RT2 contactors

Coil replacement is possible for sizes S0 to S3.

3RT1 contactors

The operating mechanisms for 3RT10..‑.A/-.N/-.P contactors are removable and can be replaced simply by unlocking and pulling them out.

NOTICE: Removal or changing of the operating mechanism is not permitted for 3RT10..‑.S contactors with fail-safe control.

Safety applications

Contactors are a significant part of safety-related applications. They are generally the actuators that perform the switching operation leading to the safe disconnection of the corresponding application or system.

While contactors with small powers can be connected directly to the outputs of a fail-safe controller, implementing safety-related applications with standard contactors with higher power is much more complicated and elaborate because of the necessary coupling links. Due to their fail-safe control input, the special versions provide a much simpler way of doing this.