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Siemens 3RT2028-2AB04 — Contactors

Siemens 3RT2028-2AB04 SIRIUS Power Contactor, S0, 34 A at 48

MPN3RT2028-2AB04
Active

Siemens SIRIUS power contactor, size S0, 3RT2028-2AB04, spring-type terminals, 34 A at 480 V AC-3, screw and snap-on 35 mm DIN rail mounting.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2028-2AB04 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2AB04 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V22 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V5 hp
Rated value @ 24 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2028-2AB04 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz24 V
3RT2028-2AB04 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2AB04 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
Short-circuit coordination type 2, fusegG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2028-2AB04 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-2AB04 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2AB04 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2AB04 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth144 mm
3RT2028-2AB04 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

Panel integration — S0 frame, spring terminals, DIN rail

With a width of 45 mm, height of 102 mm, and depth of 144 mm, it fits standard panel layouts and leaves room for adjacent devices at the specified clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm to the side. The magnet coil uses spring-type terminals, accepting solid or stranded conductors from 1 to 10 mm², or two conductors 0.5 to 2.5 mm² each.

Rated switching performance and duty cycles

The AC-3 maximum switching frequency is 750 cycles per hour, while AC-4 (plugging/reversing) is limited to 250 cycles per hour. For resistive loads (AC-1), it can switch up to 1,000 cycles per hour. For DC switching, the contactor is rated at 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.6 A at 440 V — useful for DC motor braking or auxiliary circuits. The arcing time is 10 to 10 ms at AC, and the coil draws 0.25 A at 50 Hz.

Frequently asked questions

What is 3RT2028-2AB04's listed depth?

The listed depth is 144 mm.

What wire sizes does the spring terminal accept?

The spring-type terminals accept solid or stranded conductors from 1 to 10 mm², or two conductors 0.5 to 2.5 mm² each.

Will 3RT2028-2AB04 drop into a panel specified around 3RT2015-2BB44-3MA0 without rewiring?

Both are S0 frame contactors, so the physical footprint and DIN rail mounting are the same. However, the 3RT2028-2AB04 uses spring-type terminals, while the 3RT2015-2BB44-3MA0 may use screw terminals — verify the terminal type matches your existing wiring before substituting.

MPN
3RT2028-2AB04