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Siemens 3RT2028-1BF40 — Contactors

Siemens 3RT2028-1BF40 SIRIUS Power Contactor, 110 V Coil, S0

MPN3RT2028-1BF40
Active

Siemens SIRIUS, power contactor, 3RT2028-1BF40, Size S0, 110 V AC coil, screw-type terminals, 45 mm width, 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

3RT2028-1BF40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-1BF40 — 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
3RT2028-1BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2028-1BF40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-1BF40 — 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)
3RT2028-1BF40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2028-1BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-1BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-1BF40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

It mounts on a 35 mm DIN rail per DIN EN 60715 via screw or snap-on fastening, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward — useful when panel layout forces an unconventional orientation.

Coil and switching ratings

The coil is rated 110 V AC with screw-type terminals. For DC switching, the contactor handles 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — so it covers control-circuit loads across common DC bus voltages. The arcing time sits at 10 ms, and the operate time at DC is 15–18 ms, which matters when coordinating with upstream protection or sequencing multiple contactors.

Mechanical and electrical endurance

Electrical switching frequency varies by duty: 1,000 ops/h at AC-1 (resistive), 750 ops/h at AC-2 and AC-3 (motor starting/running), and 250 ops/h at AC-4 (plugging/inching). The AC-3e rating also allows 750 ops/h. For a motor-switching application, the 750 ops/h ceiling means it handles frequent starts on a conveyor or pump without exceeding thermal limits.

Auxiliary contacts use a smaller range: 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²). The screw-type terminals are standard for panel wiring — no special tooling needed.

No last-time-buy or phase-out notice applies — the lifecycle stage is current.

Frequently asked questions

How do I get current pricing and availability for 3RT2028-1BF40?

Pricing and availability are confirmed at quote time against an RFQ. Submit a request through the storefront for a current quote.

What is 3RT2028-1BF40's listed depth?

The depth is 107 mm. Combined with the 45 mm width and 85 mm height, this defines the panel footprint for DIN-rail layout.

What wire sizes does 3RT2028-1BF40 accept?

Main contacts accept solid or stranded wire from 1 to 10 mm². Auxiliary contacts accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²).

Will 3RT2028-1BF40 drop into a panel specified around 3RT2015-1BW42?

Both are SIRIUS Size S0 contactors with the same 45 mm width and DIN-rail mounting, so the physical footprint is identical. Verify coil voltage — 3RT2028-1BF40 uses a 110 V AC coil — and terminal wiring range before substitution.

MPN
3RT2028-1BF40