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Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0
Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0
Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0
Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0
Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0
Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0

SIEMENS

Siemens 3RT2028-1BB40 Power Contactor 38A, AC-3e, 18.5kW, 24V DC, 3-Pole, S0 Original Brand New

Model / SKU3RT2028-1BB40

Siemens 3RT2028-1BB40 is a Size S0 power contactor rated at 38 A / 18.5 kW. It features a 24 V DC operating coil, 3-poles, and integrated 1 NO + 1 NC auxiliary contacts. Connectors are screw terminals. This SIRIUS component offers robust and reliable switching for industrial motor control applications.

Original price was: $283.03.Current price is: $158.31.
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  • ConditionOriginal Brand New
  • Warranty12 months
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Description

Overview

The Siemens 3RT2028-1BB40 is a high-performance power contactor from the globally renowned SIRIUS series, designed for switching motors and general industrial loads. Built in size S0, it combines a compact footprint with robust switching capacity, making it an essential component for any modern control panel, motor control center, or automation application requiring reliable power control up to 18.5 kW / 400 V.

Benefit

  • Reliable Performance: SIRIUS quality ensures long-term operational stability for critical industrial processes.

  • Direct PLC Integration: The 24 V DC coil simplifies integration, offering low-power switching and compatibility with standard automation systems.

  • Versatile Auxiliary Contacts: The built-in 1 NO + 1 NC contacts provide immediate feedback on the contactor's status for interlocking, control, and signaling circuits without the need for additional modules.

  • Secure Connection: Robust screw terminals guarantee a strong, vibration-proof connection, minimizing downtime and maintenance.

  • Space Saving: The compact Size S0 design maximizes panel space efficiency.

Function & Features

  • Rated operational current: 38 A

  • Rated motor power: 18.5 kW at 400 V

  • Control voltage: 24 V DC

  • Poles: 3-pole

  • Auxiliary contacts: 1 Normally Open (NO) + 1 Normally Closed (NC)

  • Terminal type: Screw terminal

  • Size: S0

  • Application category: AC-3e / AC-3

Application

The 3RT2028-1BB40 contactor is ideal for:

  • Motor control and protection (e.g., pumps, fans, conveyors)

  • Switching resistive loads (e.g., heating elements)

  • Controlling lighting and general-purpose industrial loads

  • Use in motor starters (Direct-on-line, Reversing)

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Datasheet in PDF

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Specifications

SKU / Model3RT2028-1BB40
BrandSIEMENS
product brand nameSIRIUS
product designationPower contactor
product type designation3RT2
size of contactorS0
product extension-
● function module for communicationNo
● auxiliary switchYes
power loss [W] for rated value of the current at AC in hot operating state11.4 W
● per pole3.8 W
power loss [W] for rated value of the current without load current share typical5.9 W
surge voltage resistance-
● of main circuit rated value6 kV
● of auxiliary circuit rated value6 kV
maximum permissible voltage for safe isolation between coil and main contacts acc. to EN 60947-1400 V
shock resistance at rectangular impulse-
shock resistance with sine pulse-
mechanical service life (switching cycles)-
● of contactor typical10 000 000
● of the contactor with added electronically optimized auxiliary switch block typical5 000 000
● of the contactor with added auxiliary switch block typical10 000 000
reference code acc. to IEC 81346-2Q
installation altitude at height above sea level maximum2 000 m
ambient temperature-
● during operation-25 ... +60 °C
● during storage-55 ... +80 °C
relative humidity minimum10 %
relative humidity at 55 °C acc. to IEC 60068-2-30 maximum95 %
number of poles for main current circuit3
number of NO contacts for main contacts3
operating voltage at AC-3 rated value maximum690 V
operational current-
● at AC-1 at 400 V at ambient temperature 40 °C rated value50 A
● at AC-1-
— up to 690 V at ambient temperature 40 °C rated value50 A
— up to 690 V at ambient temperature 60 °C rated value42 A
● at AC-4 at 400 V rated value22 A
● at AC-5a up to 690 V rated value44 A
● at AC-5b up to 400 V rated value31.5 A
— up to 230 V for current peak value n=20 rated value30.8 A
— up to 400 V for current peak value n=20 rated value30.8 A
— up to 500 V for current peak value n=20 rated value30.8 A
— up to 690 V for current peak value n=20 rated value21 A
● at AC-6a-
— up to 230 V for current peak value n=30 rated value20.5 A
— up to 400 V for current peak value n=30 rated value20.5 A
— up to 500 V for current peak value n=30 rated value21.4 A
— up to 690 V for current peak value n=30 rated value21 A
minimum cross-section in main circuit at maximum AC-1 rated value10 mm²
operational current for approx. 200000 operating cycles at AC-4-
operating power-
● at AC-3-
— at 400 V rated value18.5 kW
— at 500 V rated value18.5 kW
— at 690 V rated value18.5 kW
operating power for approx. 200000 operating cycles at AC-4-
● up to 230 V for current peak value n=20 rated value12.2 kV·A
● up to 400 V for current peak value n=20 rated value21.3 kV·A
● up to 500 V for current peak value n=20 rated value26.6 kV·A
● up to 690 V for current peak value n=20 rated value25 kV·A
operating apparent power at AC-6a-
● up to 230 V for current peak value n=30 rated value8.1 kV·A
● up to 400 V for current peak value n=30 rated value14.2 kV·A
● up to 500 V for current peak value n=30 rated value18.5 kV·A
● up to 690 V for current peak value n=30 rated value25 kV·A
short-time withstand current in cold operating state up to 40 °C-
● limited to 1 s switching at zero current maximum593 A; Use minimum cross-section acc. to AC-1 rated value
● limited to 5 s switching at zero current maximum395 A; Use minimum cross-section acc. to AC-1 rated value
● limited to 10 s switching at zero current maximum260 A; Use minimum cross-section acc. to AC-1 rated value
● limited to 30 s switching at zero current maximum186 A; Use minimum cross-section acc. to AC-1 rated value
● limited to 60 s switching at zero current maximum152 A; Use minimum cross-section acc. to AC-1 rated value
no-load switching frequency-
operating frequency-
● at AC-1 maximum1 000 1/h
● at AC-2 maximum750 1/h
● at AC-3 maximum750 1/h
● at AC-4 maximum250 1/h
type of voltage of the control supply voltageDC
control supply voltage at DC-
● rated value24 V
operating range factor control supply voltage rated value of magnet coil at DC-
● initial value0.8
● full-scale value1.1
closing power of magnet coil at DC5.9 W
holding power of magnet coil at DC5.9 W
closing delay-
opening delay-
● at DC15 ... 17.5 ms
arcing time10 ... 10 ms
control version of the switch operating mechanismStandard A1 - A2
number of NC contacts for auxiliary contacts instantaneous contact1
number of NO contacts for auxiliary contacts instantaneous contact1
operational current at AC-12 maximum10 A
operational current at AC-15-
● at 230 V rated value10 A
● at 400 V rated value3 A
● at 500 V rated value2 A
● at 690 V rated value1 A
operational current at DC-12-
operational current at DC-13-
● at 24 V rated value10 A
● at 48 V rated value2 A
● at 60 V rated value2 A
● at 110 V rated value1 A
● at 125 V rated value0.9 A
● at 220 V rated value0.3 A
contact reliability of auxiliary contacts1 faulty switching per 100 million (17 V, 1 mA)
full-load current (FLA) for 3-phase AC motor-
● at 480 V rated value34 A
● at 600 V rated value27 A
yielded mechanical performance [hp]-
● for single-phase AC motor-
— at 110/120 V rated value3 hp
— at 230 V rated value5 hp
● for 3-phase AC motor-
— at 200/208 V rated value10 hp
— at 220/230 V rated value10 hp
— at 460/480 V rated value25 hp
— at 575/600 V rated value25 hp
contact rating of auxiliary contacts according to ULA600 / P600
design of the fuse link-
● for short-circuit protection of the main circuit-
— with type of coordination 1 requiredgG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
— with type of assignment 2 requiredgG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
● for short-circuit protection of the auxiliary switch requiredgG: 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 methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
● side-by-side mountingYes
required spacing-
● with side-by-side mounting-
● for grounded parts-
● for live parts-
— forwards10 mm
— upwards10 mm
— downwards10 mm
— at the side6 mm
type of electrical connection-
● for main current circuitscrew-type terminals
● for auxiliary and control circuitscrew-type terminals
● at contactor for auxiliary contactsScrew-type terminals
● of magnet coilScrew-type terminals
— solid2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)
● at AWG cables for main contacts2x (16 ... 12), 2x (14 ... 8)
connectable conductor cross-section for main contacts-
● solid1 ... 10 mm²
● stranded1 ... 10 mm²
connectable conductor cross-section for auxiliary contacts-
● solid or stranded0.5 ... 2.5 mm²
● finely stranded with core end processing0.5 ... 2.5 mm²
type of connectable conductor cross-sections-
— solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
— finely stranded with core end processing2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
● at AWG cables for auxiliary contacts2x (20 ... 16), 2x (18 ... 14)
AWG number as coded connectable conductor cross section-
● for main contacts16 ... 8
● for auxiliary contacts20 ... 14
B10 value with high demand rate acc. to SN 31920450 000
proportion of dangerous failures-
● with low demand rate acc. to SN 3192040 %
● with high demand rate acc. to SN 3192073 %
failure rate [FIT] with low demand rate acc. to SN 31920100 FIT
T1 value for proof test interval or service life acc. to IEC 6150820 y
protection class IP on the front acc. to IEC 60529IP20
touch protection on the front acc. to IEC 60529finger-safe, for vertical contact from the front
suitability for use-
● safety-related switching OFFYes
otherDangerous Good
last modified:11/27/2021
Weight0.604 kg
Dimensions54.00 × 92.00 × 115.50 mm

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