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Siemens 3RT2028-2FB44-3MA0 — Contactors

Siemens 3RT2028-2FB44-3MA0 SIRIUS Power Contactor, Size S0,

MPN3RT2028-2FB44-3MA0
Active

Siemens SIRIUS, power contactor, Size S0, 3RT2028-2FB44-3MA0, 24 V DC coil, spring-type terminals, 45 mm width, 1 NO + 1 NC main contacts.

$102.87Ref. price · indicative, final on quote
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

3RT2028-2FB44-3MA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2FB44-3MA0 — 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
3RT2028-2FB44-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2028-2FB44-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2FB44-3MA0 — 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)
3RT2028-2FB44-3MA0 — 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
3RT2028-2FB44-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2FB44-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2FB44-3MA0 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth154 mm

Product details

Rated for a 24 V DC coil draw of 6 A at rated value, the contactor provides 1 NO + 1 NC main contacts (18...8 configuration) and is rated for mechanical endurance of 10 million operating cycles. Mounting flexibility is a strong point: it snaps onto 35 mm DIN rail per DIN EN 60715 or screws directly to a panel, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward.

Duty-Cycle Ratings and Switching Frequency

Switching frequency varies by duty class: up to 1,000 operations per hour in AC-1 (resistive loads), 750 ops/h in AC-2 and AC-3 (slip-ring and squirrel-cage motors), and 250 ops/h in AC-4 (plugging/inching duty). The AC-3e rating also allows 750 ops/h. Arcing time is 10 ms, and DC switching times (pickup/dropout) range from 15 to 18 ms. The coil pickup ratio is 0.8 of rated voltage; the dropout ratio is 1.1 of rated voltage.

Panel Integration and Clearance

At 45 mm wide, 102 mm tall, and 154 mm deep, the S0 frame fits standard DIN-rail spacing. No auxiliary switch is fitted on this variant — auxiliary contact blocks must be added separately if needed.

Frequently asked questions

What are the key dimensions of 3RT2028-2FB44-3MA0?

Width is 45 mm, height 102 mm, depth 154 mm. Required clearances: 10 mm upward, forward, and downward; 6 mm at the sides.

What wire sizes does the spring terminal accept?

Solid or stranded conductors from 1 to 10 mm², and 2x (0.5 to 2.5 mm²) for fine-stranded with ferrule.

Does 3RT2028-2FB44-3MA0 include an auxiliary switch?

No, this variant ships without an auxiliary switch. Auxiliary contact blocks must be ordered separately if needed.

What is the mechanical life rating?

Rated for 10 million mechanical operating cycles.

MPN
3RT2028-2FB44-3MA0