3RT2028-1BB40 Siemens SIRIUS Main contactor
€ 149.10
- 3RT2028-1BB40
- Power contactor
- Size S0
- AC-3
- 18.5 kW/400 V
- Auxiliary contact: 1 x NO/NC
- Control voltage: 24 V DC
- Screw connection
Main contactor Siemens SIRIUS 3RT2028-1BB40
Overview
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1) Connection system:
– Main circuit: Busbar connection (optionally with box terminals),
– Auxiliary/control circuit: screw terminals or spring-loaded terminals.
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 :
- 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,
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 contactors sizes S00 and S0, can be expanded using auxiliary switches, see . - Sizes S6 to S12: These contactors are supplied with two laterally mounted auxiliary switches. The fitting of auxiliary switches is possible on the front and on the side (the 3RT12 vacuum contactor is an exception: only lateral mounting of auxiliary switches is possible here).
For detailed information on the fitting of auxiliary switches, see .
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-loaded terminals, spring-loaded 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-loaded 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 Equipment Manual must be observed, see .
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.
Selection aids are available for fuseless assembly of motor feeders consisting of 3RV2 motor starter protector and 3RT2 contactor, see .
Motor protection
3RT2 contactors
or can be mounted on the 3RT2 contactors for protection against overload
can be mounted on the 3RT1 contactors for protection against overload.
Plant and application monitoring
For monitoring and measuring in the application, can be mounted on 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.
- Sizes S0 and S2: surge suppressors (varistors, RC elements or diode combinations) can be plugged into the front of the contactors.
- Sizes S3: the varistors and diode combinations are plugged into the front of the contactors. The RC element is plugged into the two recesses on the front of the contactor to the left of the connection block for the auxiliary switches.
- 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 contactors in sizes S00 to S3 with voltage tap-off are special versions for mounting the 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 .
Operating mechanism types
3RT2 contactors
The 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).
In addition, for sizes S2 and S3, variants with electronic operating mechanism for AC or DC operation with a fail-safe PLC input are available.
Control takes place via the control supply voltage connection A1 ‑ A2 with different operating ranges (for details on this, see the respective product data sheet).
DC coupling contactors with reduced power consumption are also ideally suited for connection to the controller.
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 PLC input
- As above, but with additional remaining lifetime indicator (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.
Contactors in safety-related 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.
Contactors with mirror contacts according to IEC 60947-4-1 are generally required for use in safety-related applications. Most of our contactors meet this requirement; a corresponding note can be found in the technical product data sheet.
Contactors with increased tamper protection
Increased tamper protection can be ensured either by using our contactor versions with factory-fitted, permanently mounted auxiliary switches which are protected against mechanical external operation (e.g. 3RT2…‑…..‑3MA0 or 3RT1…‑…..‑3PA0 contactors), or by using the or sealable cover as an accessory.
Connection of contactors to fail-safe control modules
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, special contactors provide a much simpler way of doing this:
- 3RT20..‑.S contactors in sizes S2 and S3
- 3RT10..‑.S contactors in sizes S6 to S12
For more information, see .
Example for SIL 2 and SIL 3 / PL e application – previously:
Application with safety-related disconnection with standard contactors using the example of a 3RT105 contactor
Example for SIL 3 / PL e (left-hand side) and SIL 2 / PL c (right-hand side) Application – new:
Application with safety-related disconnection with contactors with fail-safe control using the example of a 3RT105 contactor
Contactors for special applications
Article No. scheme
Note:
The Article No. scheme shows an overview of product versions for better understanding of the logic behind the article numbers.
Please use the article numbers specified in the selection and ordering data for your order.
Technical specifications
3RT2028-1BB40
Power contactor, AC-3 38 A, 18.5 kW / 400 V 1 NO + 1 NC, 24 V DC 3-pole, size S0 screw terminals
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| Weight | 0.604 kg |
|---|---|
| Dimensions | 54.00 × 92.00 × 115.50 mm |
| Brand | SIEMENS |
| product brand name | SIRIUS |
| product designation | Power contactor |
| product type designation | 3RT2 |
| size of contactor | S0 |
| product extension | – |
| ● function module for communication | No |
| ● auxiliary switch | Yes |
| power loss [W] for rated value of the current at AC in hot operating state | 11.4 W |
| ● per pole | 3.8 W |
| power loss [W] for rated value of the current without load current share typical | 5.9 W |
| surge voltage resistance | – |
| ● of main circuit rated value | 6 kV |
| ● of auxiliary circuit rated value | 6 kV |
| maximum permissible voltage for safe isolation between coil and main contacts acc. to EN 60947-1 | 400 V |
| shock resistance at rectangular impulse | – |
| shock resistance with sine pulse | – |
| mechanical service life (switching cycles) | – |
| ● of contactor typical | 10 000 000 |
| ● of the contactor with added electronically optimized auxiliary switch block typical | 5 000 000 |
| ● of the contactor with added auxiliary switch block typical | 10 000 000 |
| reference code acc. to IEC 81346-2 | Q |
| installation altitude at height above sea level maximum | 2 000 m |
| ambient temperature | – |
| ● during operation | -25 … +60 °C |
| ● during storage | -55 … +80 °C |
| relative humidity minimum | 10 % |
| relative humidity at 55 °C acc. to IEC 60068-2-30 maximum | 95 % |
| number of poles for main current circuit | 3 |
| number of NO contacts for main contacts | 3 |
| operating voltage at AC-3 rated value maximum | 690 V |
| operational current | – |
| ● at AC-1 at 400 V at ambient temperature 40 °C rated value | 50 A |
| ● at AC-1 | – |
| — up to 690 V at ambient temperature 40 °C rated value | 50 A |
| — up to 690 V at ambient temperature 60 °C rated value | 42 A |
| ● at AC-4 at 400 V rated value | 22 A |
| ● at AC-5a up to 690 V rated value | 44 A |
| ● at AC-5b up to 400 V rated value | 31.5 A |
| — up to 230 V for current peak value n=20 rated value | 30.8 A |
| — up to 400 V for current peak value n=20 rated value | 30.8 A |
| — up to 500 V for current peak value n=20 rated value | 30.8 A |
| — up to 690 V for current peak value n=20 rated value | 21 A |
| ● at AC-6a | – |
| — up to 230 V for current peak value n=30 rated value | 20.5 A |
| — up to 400 V for current peak value n=30 rated value | 20.5 A |
| — up to 500 V for current peak value n=30 rated value | 21.4 A |
| — up to 690 V for current peak value n=30 rated value | 21 A |
| minimum cross-section in main circuit at maximum AC-1 rated value | 10 mm² |
| operational current for approx. 200000 operating cycles at AC-4 | – |
| operating power | – |
| ● at AC-3 | – |
| — at 400 V rated value | 18.5 kW |
| — at 500 V rated value | 18.5 kW |
| — at 690 V rated value | 18.5 kW |
| operating power for approx. 200000 operating cycles at AC-4 | – |
| ● up to 230 V for current peak value n=20 rated value | 12.2 kV·A |
| ● up to 400 V for current peak value n=20 rated value | 21.3 kV·A |
| ● up to 500 V for current peak value n=20 rated value | 26.6 kV·A |
| ● up to 690 V for current peak value n=20 rated value | 25 kV·A |
| operating apparent power at AC-6a | – |
| ● up to 230 V for current peak value n=30 rated value | 8.1 kV·A |
| ● up to 400 V for current peak value n=30 rated value | 14.2 kV·A |
| ● up to 500 V for current peak value n=30 rated value | 18.5 kV·A |
| ● up to 690 V for current peak value n=30 rated value | 25 kV·A |
| short-time withstand current in cold operating state up to 40 °C | – |
| ● limited to 1 s switching at zero current maximum | 593 A; Use minimum cross-section acc. to AC-1 rated value |
| ● limited to 5 s switching at zero current maximum | 395 A; Use minimum cross-section acc. to AC-1 rated value |
| ● limited to 10 s switching at zero current maximum | 260 A; Use minimum cross-section acc. to AC-1 rated value |
| ● limited to 30 s switching at zero current maximum | 186 A; Use minimum cross-section acc. to AC-1 rated value |
| ● limited to 60 s switching at zero current maximum | 152 A; Use minimum cross-section acc. to AC-1 rated value |
| no-load switching frequency | – |
| operating frequency | – |
| ● at AC-1 maximum | 1 000 1/h |
| ● at AC-2 maximum | 750 1/h |
| ● at AC-3 maximum | 750 1/h |
| ● at AC-4 maximum | 250 1/h |
| type of voltage of the control supply voltage | DC |
| control supply voltage at DC | – |
| ● rated value | 24 V |
| operating range factor control supply voltage rated value of magnet coil at DC | – |
| ● initial value | 0.8 |
| ● full-scale value | 1.1 |
| closing power of magnet coil at DC | 5.9 W |
| holding power of magnet coil at DC | 5.9 W |
| closing delay | – |
| opening delay | – |
| ● at DC | 15 … 17.5 ms |
| arcing time | 10 … 10 ms |
| control version of the switch operating mechanism | Standard A1 – A2 |
| number of NC contacts for auxiliary contacts instantaneous contact | 1 |
| number of NO contacts for auxiliary contacts instantaneous contact | 1 |
| operational current at AC-12 maximum | 10 A |
| operational current at AC-15 | – |
| ● at 230 V rated value | 10 A |
| ● at 400 V rated value | 3 A |
| ● at 500 V rated value | 2 A |
| ● at 690 V rated value | 1 A |
| operational current at DC-12 | – |
| operational current at DC-13 | – |
| ● at 24 V rated value | 10 A |
| ● at 48 V rated value | 2 A |
| ● at 60 V rated value | 2 A |
| ● at 110 V rated value | 1 A |
| ● at 125 V rated value | 0.9 A |
| ● at 220 V rated value | 0.3 A |
| contact reliability of auxiliary contacts | 1 faulty switching per 100 million (17 V, 1 mA) |
| full-load current (FLA) for 3-phase AC motor | – |
| ● at 480 V rated value | 34 A |
| ● at 600 V rated value | 27 A |
| yielded mechanical performance [hp] | – |
| ● for single-phase AC motor | – |
| — at 110/120 V rated value | 3 hp |
| — at 230 V rated value | 5 hp |
| ● for 3-phase AC motor | – |
| — at 200/208 V rated value | 10 hp |
| — at 220/230 V rated value | 10 hp |
| — at 460/480 V rated value | 25 hp |
| — at 575/600 V rated value | 25 hp |
| contact rating of auxiliary contacts according to UL | A600 / P600 |
| design of the fuse link | – |
| ● for short-circuit protection of the main circuit | – |
| — with type of coordination 1 required | gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA) |
| — with type of assignment 2 required | gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA) |
| ● for short-circuit protection of the auxiliary switch required | gG: 10 A (500 V, 1 kA) |
| mounting position | +/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface |
| fastening method | screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715 |
| ● side-by-side mounting | Yes |
| required spacing | – |
| ● with side-by-side mounting | – |
| ● for grounded parts | – |
| ● for live parts | – |
| — forwards | 10 mm |
| — upwards | 10 mm |
| — downwards | 10 mm |
| — at the side | 6 mm |
| type of electrical connection | – |
| ● for main current circuit | screw-type terminals |
| ● for auxiliary and control circuit | screw-type terminals |
| ● at contactor for auxiliary contacts | Screw-type terminals |
| ● of magnet coil | Screw-type terminals |
| — solid | 2x (1 … 2.5 mm²), 2x (2.5 … 10 mm²) |
| ● at AWG cables for main contacts | 2x (16 … 12), 2x (14 … 8) |
| connectable conductor cross-section for main contacts | – |
| ● solid | 1 … 10 mm² |
| ● stranded | 1 … 10 mm² |
| connectable conductor cross-section for auxiliary contacts | – |
| ● solid or stranded | 0.5 … 2.5 mm² |
| ● finely stranded with core end processing | 0.5 … 2.5 mm² |
| type of connectable conductor cross-sections | – |
| — solid or stranded | 2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²) |
| — finely stranded with core end processing | 2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²) |
| ● at AWG cables for auxiliary contacts | 2x (20 … 16), 2x (18 … 14) |
| AWG number as coded connectable conductor cross section | – |
| ● for main contacts | 16 … 8 |
| ● for auxiliary contacts | 20 … 14 |
| B10 value with high demand rate acc. to SN 31920 | 450 000 |
| proportion of dangerous failures | – |
| ● with low demand rate acc. to SN 31920 | 40 % |
| ● with high demand rate acc. to SN 31920 | 73 % |
| failure rate [FIT] with low demand rate acc. to SN 31920 | 100 FIT |
| T1 value for proof test interval or service life acc. to IEC 61508 | 20 y |
| protection class IP on the front acc. to IEC 60529 | IP20 |
| touch protection on the front acc. to IEC 60529 | finger-safe, for vertical contact from the front |
| suitability for use | – |
| ● safety-related switching OFF | Yes |
| other | Dangerous Good |
| last modified: | 11/27/2021 |
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