Skip to main content
Log in
Siemens 3RT2028-1AP04 — Contactors

Siemens 3RT2028-1AP04 SIRIUS S0 Power Contactor, 34 A at 480

MPN3RT2028-1AP04
Active

Siemens SIRIUS S0 power contactor, 3RT2028-1AP04, 34 A at 480 V AC-3, screw terminals, 45 mm wide, snap-on 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

3RT2028-1AP04 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-1AP04 — 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
3RT2028-1AP04 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz230 V
3RT2028-1AP04 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-1AP04 — 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)
3RT2028-1AP04 — 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
3RT2028-1AP04 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-1AP04 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-1AP04 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth141 mm
3RT2028-1AP04 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

SIRIUS S0 power contactor, 34 A at 480 V

The Siemens 3RT2028-1AP04 is a SIRIUS S0-size power contactor rated 34 A at 480 V — the AC-3 motor-switching current that governs the real load it can handle, not the AC-1 resistive figure.

DC switching and operating rates

DC switching ratings are given per voltage: 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, 3 A at 400 V, and 0.6 A at 440 V. These are the DC-1 or DC-3 values — the arc extinction in DC is harder than AC, so the rating drops as voltage rises. For AC motor duty, the maximum operating rate is 750 cycles per hour at AC-3 and AC-2, and 250 cycles per hour at AC-4 (plugging/reversing).

Wiring and clearance

Auxiliary contact terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). That 6 mm side clearance is tight — factor it into your DIN-rail layout if you are packing multiple contactors side by side.

Frequently asked questions

What is 3RT2028-1AP04's listed depth?

The depth is 141 mm, with a width of 45 mm and height of 85 mm.

What wire sizes does 3RT2028-1AP04 accept?

Main contacts accept solid or stranded wire from 1 to 10 mm². Auxiliary terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²).

Will 3RT2028-1AP04 drop into a panel specified around 3RT2026-1BB40-0UA0 without rewiring?

Both are SIRIUS S0-size contactors on the same 45 mm footprint with screw terminals and snap-on DIN rail mounting, so the mechanical fit and terminal layout are identical. The electrical ratings differ — verify the coil voltage and load current against your BOM before swapping.

MPN
3RT2028-1AP04