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Siemens 3RT2028-1AL24 — Contactors

Siemens 3RT2028-1AL24 SIRIUS Power Contactor, Size S0, 24 VD

MPN3RT2028-1AL24
Active

Siemens SIRIUS power contactor, 3RT2028-1AL24, Size S0, screw-type terminals, 24 VDC coil, snap-on mounting onto 35 mm DIN rail.

$67.31Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT2028-1AL24 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-1AL24 — 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
3RT2028-1AL24 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz230 V
3RT2028-1AL24 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-1AL24 — 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)
3RT2028-1AL24 — 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
3RT2028-1AL24 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-1AL24 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-1AL24 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth141 mm
3RT2028-1AL24 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

The Size S0 frame and 45 mm width make it a standard panel-building fit for motor starter assemblies or direct-on-line contactor duty.

Switching Duty and Cycle Rates

Maximum switching frequency depends on the duty class: 1,000 cycles/h for AC-1 resistive loads, 750 cycles/h for AC-2 and AC-3 motor starting, and 250 cycles/h for AC-4 plugging/inching duty. The AC-3e rating also caps at 750 cycles/h.

These spacing rules matter for heat dissipation and arc-flash containment in dense panels.

Auxiliary contact terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The screw-type coil terminals are standard for panel wiring practices.

Frequently asked questions

What are the key dimensions of 3RT2028-1AL24?

Depth 141 mm, width 45 mm, height 85 mm. The Size S0 frame fits standard DIN-rail layouts.

What wire sizes does 3RT2028-1AL24 accept?

Solid or stranded main conductors from 1 to 10 mm². Auxiliary terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).

Where can I buy 3RT2028-1AL24?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

How does 3RT2028-1AL24 compare to 3RT2036-1AC20-ZX95?

Both are SIRIUS Size S0 contactors, but the 3RT2036-1AC20-ZX95 carries a different coil voltage and may include special features (ZX95 suffix). The 3RT2028-1AL24 uses a 24 VDC coil with screw terminals. Panel footprint and DIN-rail mounting are identical, so it can drop into the same physical slot, but verify coil voltage compatibility before substitution.

MPN
3RT2028-1AL24