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Siemens 3RT2028-2AM20 SIRIUS Power Contactor, S0 Size, 45 mm

MPN3RT2028-2AM20

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Siemens SIRIUS 3RT2028-2AM20 power contactor, size S0, 45 mm width, spring-type terminals for main and coil circuits, screw and snap-on 35 mm DIN rail mounting.

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Siemens 3RT2028-2AM20 datasheet (PDF)

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

Specifications

3RT2028-2AM20 — Identification
Parameter	Value
Contactor frame size	S0

3RT2028-2AM20 — Ratings & Performance
Parameter	Value
Rated operational current, AC-12, max.	10 A
Rated operational current, AC-4 @ 400 V	22 A
Rated value @ 400 V	3 A
Rated value @ 500 V	2 A
Rated value @ 690 V	1 A
Rated value @ 230 V	5 hp
Rated value @ 24 V	10 A
Rated value @ 60 V	2 A
Rated value @ 110 V	1 A
Rated value @ 220 V	0.3 A

3RT2028-2AM20 — Control & Coil
Parameter	Value
Control supply voltage type	AC
Rated value @ 50 Hz	0.25
Rated value @ 50 Hz	208 V

3RT2028-2AM20 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2028-2AM20 — Protection & Coordination
Parameter	Value
Short-circuit coordination type 1, fuse	gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
Short-circuit coordination type 2, fuse	gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
Aux. switch short-circuit protection, fuse	gG: 10 A (500 V, 1 kA)

3RT2028-2AM20 — Connection & Mounting
Parameter	Value
Main circuit connection	spring-loaded terminals
Aux. / control circuit connection	spring-loaded terminals
Conductor cross-section, solid	1 ... 10 mm²
Conductor cross-section, solid or stranded	2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule	2x (0.5 ... 1.5 mm²)
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2028-2AM20 — Durability
Parameter	Value
Durability (operating cycles, typ.)	10 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2028-2AM20 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2028-2AM20 — Mechanical
Parameter	Value
Width	45 mm
Height	102 mm
Depth	97 mm

3RT2028-2AM20 — Specifications
Parameter	Value
At AC	4 ... 16 ms

Product details

The 3RT2028-2AM20: Dimensions are 102 mm height, 45 mm width, 97 mm depth. The S0 frame keeps the footprint compact for a contactor rated for motor switching at this size class.