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Siemens 3RT2028-2BB44-ZX95 — Contactors

Siemens 3RT2028-2BB44-ZX95 SIRIUS Power Contactor, S0, Sprin

MPN3RT2028-2BB44-ZX95
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Siemens SIRIUS 3RT2028-2BB44-ZX95 power contactor, size S0, spring-type terminals, 24 VDC coil, 45 mm width, 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

3RT2028-2BB44-ZX95 — Identification
ParameterValue
Contactor frame sizeS0
3RT2028-2BB44-ZX95 — 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
3RT2028-2BB44-ZX95 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2028-2BB44-ZX95 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2028-2BB44-ZX95 — 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)
3RT2028-2BB44-ZX95 — 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
3RT2028-2BB44-ZX95 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2028-2BB44-ZX95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2028-2BB44-ZX95 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth154 mm

Product details

At 45 mm wide, 102 mm tall, and 154 mm deep, it fits standard panel layouts with clearance requirements: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side.

The 24 VDC coil draws 6 A at rated voltage, with a pickup/dropout ratio of 0.8 initial to 1.1 full-scale — meaning it holds in reliably down to about 19.2 V and drops out cleanly below that, which matters for brownout ride-through on a mill line. Switching frequency limits are class-typical for this size: 1000 cycles/hour at AC-1 (resistive loads), 750 cycles/hour at AC-3 (standard motor starts), and 250 cycles/hour at AC-4 (plugging/inching duty). The AC-3e rating matches the 750 cycles/hour ceiling, so it handles repetitive conveyor or pump starts without derating.

Mounting and Wiring Flexibility

The spring-cage terminals accept 2x (0.5 to 2.5 mm²) for daisy-chaining auxiliary wiring.

Frequently asked questions

Where can I buy the 3RT2028-2BB44-ZX95?

This contactor is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.

What are the key dimensions for panel layout?

Width is 45 mm, height 102 mm, depth 154 mm. Clearance required: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side.

What wire sizes does the spring terminal accept?

Solid or stranded conductors from 1 to 10 mm², and two conductors of 0.5 to 2.5 mm² each.

MPN
3RT2028-2BB44-ZX95