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Siemens 3RT2028-2BB40-0AA6 — Contactors

Siemens 3RT2028-2BB40-0AA6 SIRIUS Power Contactor, 24 VDC Co

MPN3RT2028-2BB40-0AA6

Siemens SIRIUS power contactor, 3RT2028-2BB40-0AA6, S0 frame, 24 VDC coil, spring-type terminals, 10 A at 24 VDC, 5 hp at 230 VAC.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT2028-2BB40-0AA6 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2BB40-0AA6 — 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 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2028-2BB40-0AA6 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2028-2BB40-0AA6 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2BB40-0AA6 — 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)
3RT2028-2BB40-0AA6 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-2BB40-0AA6 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2BB40-0AA6 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2BB40-0AA6 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth107 mm

Product details

It switches motor loads up to 5 hp at 230 VAC and handles 10 A at 24 VDC for DC loads — the DC-13 curve drops to 0.3 A at 220 VDC, so watch the voltage derating if you're switching solenoids or brakes on a higher DC bus. The included auxiliary switch saves a separate add-on for basic feedback.

The S0 footprint is 45 mm wide, 102 mm tall, 107 mm deep.

Termination & Wiring

For fine-stranded conductors with ferrules, the terminal accepts 2x (0.5 to 2.5 mm²). No screwdriver needed — strip, insert, done. The main contact configuration is 18-8 (3 NO + 1 NC).

Operating Conditions & Performance

Coil pick-up voltage is 0.8 x rated (19.2 V for a 24 V coil), drop-out is below 18 V. Arcing time is 10 ms; DC operating time is 15-18 ms. Switching frequency varies by duty: 1000 ops/h for AC-1 (resistive), 750 ops/h for AC-2 and AC-3 (motor start/run), 250 ops/h for AC-4 (plugging/inching). Overload factor is 1.1.

Frequently asked questions

Where can I buy 3RT2028-2BB40-0AA6 and what is the lead time?

This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send the quantity for a firm lead time.

What is the closest functional second-source to 3RT2028-2BB40-0AA6?

The 3RT2036-1AC20-ZX95 is a larger-frame SIRIUS contactor (S2 vs S0) with a different coil voltage and terminal arrangement — it will not drop into the same panel footprint without rewiring. Stick with the S0 frame for a direct mechanical fit.

What is the depth of 3RT2028-2BB40-0AA6?

The depth is 107 mm.

What wire sizes does the 3RT2028-2BB40-0AA6 accept?

Solid or stranded wire from 1 to 10 mm². For fine-stranded with ferrules, it accepts 2x (0.5 to 2.5 mm²).

MPN
3RT2028-2BB40-0AA6