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Siemens 3RT6027-1BB40 — Contactors

Siemens 3RT6027-1BB40 SIRIUS Contactor, 24 VDC Coil, S0 Size

MPN3RT6027-1BB40

Siemens SIRIUS S0 power contactor, 24 VDC coil, screw terminals, 27.5 kW at 400 V AC-3, 45 mm wide, 107 mm deep, current production lifecycle.

Siemens 3RT6027-1BB40 datasheet (PDF)
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

3RT6027-1BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT6027-1BB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT6027-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT6027-1BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT6027-1BB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 100 A
Short-circuit coordination type 2, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 35 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT6027-1BB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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 50022
Side-by-side mountingYes
3RT6027-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT6027-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT6027-1BB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

The Siemens 3RT6027-1BB40 is a SIRIUS-brand S0-frame power contactor with a 24 VDC coil, sized for motor loads up to 27.5 kW at 400 V AC-3 (47.5 kW at 690 V AC-3). The 45 mm wide, 107 mm deep footprint fits the standard 35 mm DIN rail (DIN EN 50022) with screw and snap-on mounting, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward — useful when panel layout forces an off-axis install. Rated operational voltage for AC-3 and AC-3e duty is 690 V maximum.

Termination & Wiring

Both main and auxiliary/control circuits use screw-type terminals. Main contacts accept 2x (0.5 to 1.5 mm²) solid/stranded or 2x (0.75 to 2.5 mm²), with AWG equivalents 2x (16 to 12) and 2x (14 to 8).

Mechanical & Electrical Endurance

Maximum switching rates: 1,500 cycles/hour at DC, 1,000 cycles/hour at AC-1 (resistive), 750 cycles/hour at AC-3/AC-3e (motor), and 250 cycles/hour at AC-4 (plugging/inching). The AC-4 rate is the limiting factor for high-duty-cycle reversing or jogging applications — if your process does frequent inching, stay under 250 cycles/hour or oversize to the next frame.

The substance prohibitance date of 05/01/2012 aligns with RoHS and REACH compliance milestones — the part is compliant with EU substance restrictions as of that date.

Frequently asked questions

Will 3RT6027-1BB40 drop into a panel specified around 3RT6027-1AC20?

Both are S0-frame contactors with the same 45 mm width and 107 mm depth, so the mechanical footprint is identical. The difference is the coil voltage — 1BB40 is 24 VDC, while 1AC20 is an AC coil variant. If the panel wiring and control transformer are already set for 24 VDC, this is a direct swap; if the panel was built for AC coil control, you would need to change the coil supply.

What compliance documentation does Siemens provide for 3RT6027-1BB40?

The part carries a substance prohibitance date of 05/01/2012, indicating RoHS and REACH compliance. Standard Siemens SIRIUS documentation includes a CE declaration of conformity and UL/CSA file numbers available on request.

MPN
3RT6027-1BB40