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Siemens 3RT2028-1AK64-3MA0 — Contactors

Siemens 3RT2028-1AK64-3MA0 SIRIUS S0 Power Contactor, 45 mm

MPN3RT2028-1AK64-3MA0
Active

Siemens SIRIUS S0 power contactor, 3RT2028-1AK64-3MA0, screw-type coil terminals, 45 mm width, screw and snap-on mounting for 35 mm DIN rail per DIN EN 60715.

Siemens 3RT2028-1AK64-3MA0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2028-1AK64-3MA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-1AK64-3MA0 — 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
3RT2028-1AK64-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz110 V
3RT2028-1AK64-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-1AK64-3MA0 — 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)
3RT2028-1AK64-3MA0 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-1AK64-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-1AK64-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-1AK64-3MA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth141 mm
3RT2028-1AK64-3MA0 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

SIRIUS S0 power contactor — panel integration notes

The 45 mm width and 85 mm height fit standard S0 panel layouts, with a 141 mm depth that leaves clearance for front-of-panel wiring access. Switching frequency varies by duty class: up to 1,000 cycles/hour at AC-1 (resistive loads), 750 cycles/hour at AC-2 and AC-3 (motor starting/running), and 250 cycles/hour at AC-4 (plugging/inching). For AC-3e duty, the same 750 cycles/hour applies. The arcing time is 10 ms at AC, which informs coordination with upstream protective devices.

Wiring and clearance

Main contacts accept solid or stranded conductors from 1 to 10 mm²; auxiliary contacts accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded. These clearances are for arc flash and heat dissipation — maintain them in the panel layout.

Frequently asked questions

How do I get current pricing and availability for 3RT2028-1AK64-3MA0?

Pricing and availability are confirmed at quote time against an RFQ. Submit a request through our sourcing desk for current market pricing and lead time on this active SIRIUS S0 contactor.

What are the key switching frequency ratings for this contactor?

At AC-1 (resistive loads) it handles up to 1,000 cycles/hour; at AC-2 and AC-3 (motor duty) 750 cycles/hour; at AC-4 (plugging/inching) 250 cycles/hour. The arcing time is 10 ms at AC.

What mounting clearances does 3RT2028-1AK64-3MA0 require?

Minimum clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. The contactor mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715.

MPN
3RT2028-1AK64-3MA0