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Siemens 3RT2028-2AL24 SIRIUS Power Contactor, Size S0, 24 VD

MPN3RT2028-2AL24

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Siemens SIRIUS, power contactor, Size S0, 3RT2028-2AL24, 24 VDC coil, spring-type terminals, 45 mm width, 102 mm height, 144 mm depth.

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Siemens 3RT2028-2AL24 datasheet (PDF)

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

Specifications

3RT2028-2AL24 — Identification
Parameter	Value
Contactor frame size	S0

3RT2028-2AL24 — 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	6 A
Rated value @ 60 V	2 A
Rated value @ 110 V	1 A
Rated value @ 220 V	0.3 A

3RT2028-2AL24 — Control & Coil
Parameter	Value
Control supply voltage type	AC
Rated value @ 50 Hz	0.25
Rated value @ 50 Hz	230 V

3RT2028-2AL24 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2028-2AL24 — 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)

3RT2028-2AL24 — 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 standard mounting rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2028-2AL24 — Durability
Parameter	Value
Durability (operating cycles, typ.)	10 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2028-2AL24 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2028-2AL24 — Mechanical
Parameter	Value
Width	45 mm
Height	102 mm
Depth	144 mm

3RT2028-2AL24 — Specifications
Parameter	Value
At AC	4 ... 16 ms

Product details

DIN Rail Fit and Panel Clearances

At 45 mm wide, 102 mm tall, and 144 mm deep, the 3RT2028-2AL24 occupies a standard S0 footprint.

Switching Duty and Mechanical Life

Maximum switching frequency varies by duty: 1000 ops/h under AC-1 (resistive), 750 ops/h under AC-2 or AC-3 (motor starting/running), and 250 ops/h under AC-4 (plugging/inching). The main contact rating is 18-8 (likely 18 A AC-3 / 8 A AC-4 class for this frame). That covers most panel environments short of a foundry floor.