Skip to main content
Log in
Siemens 3RT2028-2AL20 — Contactors

Siemens 3RT2028-2AL20 SIRIUS S0 Power Contactor, 45 mm wide

MPN3RT2028-2AL20
Active

Siemens SIRIUS S0 power contactor, 3RT2028-2AL20, spring-type terminals, 45 mm width, screw and snap-on 35 mm DIN rail mounting.

Siemens 3RT2028-2AL20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2028-2AL20 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2AL20 — 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 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2028-2AL20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz230 V
3RT2028-2AL20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2AL20 — 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)
3RT2028-2AL20 — 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-2AL20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2AL20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2AL20 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth97 mm
3RT2028-2AL20 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

Duty-cycle and switching frequency

Rated for up to 1 000 switching cycles per hour at AC-1 (resistive load), 750/h at AC-2 and AC-3 (motor starting and running), and 250/h at AC-4 (plugging/inching). The AC-3e rating also sits at 750/h.

The built-in auxiliary switch is rated at 10 A at 24 V, 2 A at 48 V or 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V — covers most control-voltage levels in a panel.

Conductor cross-section accepts solid or stranded 1…10 mm², or 2x (0.5…2.5 mm²) for the auxiliary circuit.

Frequently asked questions

What are the key dimensions of 3RT2028-2AL20?

Width 45 mm, height 102 mm, depth 97 mm — standard S0 contactor footprint.

What conductor sizes does the 3RT2028-2AL20 accept?

Solid or stranded 1…10 mm² for the main circuit; auxiliary terminals accept 2x (0.5…2.5 mm²).

Will 3RT2028-2AL20 drop into a panel built for 3RT2015-2AP02?

Both are SIRIUS S0 contactors on the same 45 mm DIN-rail footprint, so the panel cutout and mounting rail are identical — wiring differences depend on the coil voltage and terminal type (spring vs screw). Check the coil rating on your existing panel before swapping.

MPN
3RT2028-2AL20