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Siemens 3RT2027-2BB44 — Contactors

Siemens 3RT2027-2BB44 SIRIUS Power Contactor, 24 VDC Coil, S

MPN3RT2027-2BB44
Active

Siemens SIRIUS power contactor 3RT2027-2BB44, S0 frame, 24 VDC coil, spring-type terminals, 45 mm width on DIN rail.

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

3RT2027-2BB44 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-2BB44 — 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
3RT2027-2BB44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-2BB44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-2BB44 — 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)
3RT2027-2BB44 — 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
3RT2027-2BB44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-2BB44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-2BB44 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth154 mm

Product details

The coil is 24 VDC with spring-type terminals, rated to pick up at 0.8 x the rated value and hold at up to 1.1 x the rated value. No built-in auxiliary switch is fitted.

The headline motor rating is 5 hp at 230 V, which is the AC-3 duty point for a standard squirrel-cage motor. That tells you the contactor is sized for a 3–4 kW motor on a 230 V three-phase line. For DC switching, the rated breaking currents drop sharply with voltage: 6 A at 24 VDC, 2 A at 48 V, 1 A at 110 V, 0.3 A at 220 V — this is the DC-13 rating for switching solenoids and electromagnets. Switching frequency limits are: 1 000 cycles/hour for AC-1 resistive loads, 750 cycles/hour for AC-2 and AC-3 motor loads, and 250 cycles/hour for AC-4 reversing or inching duty. The AC-3e rating at 750 cycles/hour applies to energy-efficient IE3/IE4 motors with higher inrush.

Mounting and Clearance — Panel Integration

Height is 102 mm, depth is 154 mm. Clearance needed: 10 mm above and below, 10 mm forward, 6 mm at the sides.

Frequently asked questions

What is the closest functional second-source — 3RT2028-1BB44-3MA0?

The 3RT2028-1BB44-3MA0 is a peer in the same S0 frame family, but it carries a different coil voltage and auxiliary contact configuration. The 3RT2027-2BB44 has a 24 VDC coil with spring-type terminals and no auxiliary switch. If your panel was wired for 24 VDC and spring terminals, the 3RT2028-1BB44-3MA0 may not drop in without rewiring. Verify the coil voltage and auxiliary contact count before substituting.

What is the listed depth?

The depth is 154 mm. That is the dimension from the DIN rail mounting surface to the front of the contactor body, not including any protruding auxiliary contact blocks or wiring.

What wire sizes does it accept?

The main contacts accept solid or stranded wire from 1 to 10 mm². The coil terminals accept 2 x (0.5 to 2.5 mm²) solid or stranded. All terminations are spring-type — no screw tightening required.

Will it drop into a panel specified for 3RT2028-1BB44-3MA0 without rewiring?

Only if the panel was wired for a 24 VDC coil and spring-type terminals, and no auxiliary contacts were required. The 3RT2028-1BB44-3MA0 may have a different coil voltage or auxiliary configuration. Check the nameplate coil rating and the auxiliary contact count before assuming a direct swap.

MPN
3RT2027-2BB44