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Siemens 3RT2027-1BF44 — Contactors

Siemens 3RT2027-1BF44 SIRIUS Power Contactor, Size S0, 110 V

MPN3RT2027-1BF44
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Siemens SIRIUS power contactor, 3RT2027-1BF44, Size S0, 110 V AC coil, screw-type terminals, 45 mm width, DIN rail mount.

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

3RT2027-1BF44 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1BF44 — 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
3RT2027-1BF44 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-1BF44 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1BF44 — 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)
3RT2027-1BF44 — 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
3RT2027-1BF44 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1BF44 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1BF44 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth151 mm

Product details

The 110 V AC coil uses screw-type terminals and mounts via screw fixing or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width and 151 mm depth fit standard panel layouts; the S0 frame size is the mid-range footprint in the SIRIUS contactor family, balancing current capacity with panel density.

Operating temperature range of -25 to +60 °C covers most indoor panel environments; storage from -55 to +80 °C. Mechanical life is typical 10,000,000 operations — this is the no-load endurance figure, not the electrical life under load. Switching rates vary by duty: up to 1,000 cycles/hour at AC-1 (resistive), 750/h at AC-2 and AC-3 (motor starting/running), and 250/h at AC-4 (plugging/inching) (–,). The AC-3e rating also caps at 750/h. For a motor starter application, the AC-3 rate is the one that governs — plan for 750 operations per hour maximum under full-load switching.

Wiring and clearances

Auxiliary contact wiring uses 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward — useful when fitting into tight or angled enclosures.

Frequently asked questions

What are the key dimensions of this contactor?

Width 45 mm, height 85 mm, depth 151 mm. The S0 frame size is the mid-range SIRIUS contactor footprint.

What wire sizes does the 3RT2027-1BF44 accept?

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

Where can I buy the 3RT2027-1BF44?

This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing.

MPN
3RT2027-1BF44