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Siemens 3RT2028-2BW40 — Contactors

Siemens 3RT2028-2BW40 SIRIUS Power Contactor, Size S0, Sprin

MPN3RT2028-2BW40
Active

Siemens SIRIUS power contactor, Size S0, 3RT2028-2BW40, spring-type coil terminals, screw and snap-on DIN rail mounting.

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

3RT2028-2BW40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2BW40 — 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
3RT2028-2BW40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2028-2BW40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2BW40 — 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)
3RT2028-2BW40 — 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 standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-2BW40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2BW40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2BW40 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth107 mm

Product details

It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward — useful when panel layout is tight and the contactor must sit at an angle. The AC-1 resistive load maximum is 1 000 cycles/h. These duty-cycle limits define the contactor's thermal endurance — exceeding them shortens contact life, especially under AC-4 where arcing is heaviest. DC switching capability is specified at several voltages: 10 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, and 3 A at 400 V. These are the maximum make/break currents for DC loads — inductive loads (relays, solenoids) will need derating or arc-suppression, as DC arcs sustain longer than AC.

Integration notes

Main contact wire range accepts 1... 10 mm² solid or stranded, and the auxiliary contact terminals accept 2x (0.5... 2.5 mm²) solid or stranded — spring-cage on the coil side, screw-type on the main contacts. These are the minimum air gaps to grounded metal or adjacent devices — respect them to avoid flashover, especially in polluted environments. Operating temperature range -25... +60 °C; storage -55... +80 °C. The storage range is wider — handling, not running, is what that limit governs. Coil pick-up voltage is 0.8 x rated, drop-out typically below 0.6 x rated; the arcing time is 10... 10 ms and the DC operating time is 15... 17.5 ms.

Frequently asked questions

What is the depth of 3RT2028-2BW40?

The depth is 107 mm, with a width of 45 mm and height of 102 mm.

MPN
3RT2028-2BW40