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Siemens 3RT2027-4KF40-0RB0 — Contactors

Siemens 3RT2027-4KF40-0RB0 SIRIUS Coupling Contactor, S0, 24

MPN3RT2027-4KF40-0RB0

Siemens SIRIUS coupling contactor, size S0, 3RT2027-4KF40-0RB0, 24 VDC coil, 27 A at 480 V / 27 A at 600 V, screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715.

Siemens 3RT2027-4KF40-0RB0 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

3RT2027-4KF40-0RB0 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-4KF40-0RB0 — 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
3RT2027-4KF40-0RB0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-4KF40-0RB0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-4KF40-0RB0 — 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)
3RT2027-4KF40-0RB0 — Connection & Mounting
ParameterValue
Main circuit connectionRing cable lug connection
Aux. / control circuit connectionring terminal lug connection
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2027-4KF40-0RB0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-4KF40-0RB0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-4KF40-0RB0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

SIRIUS coupling contactor, S0 frame, 24 VDC coil

The Siemens SIRIUS 3RT2027-4KF40-0RB0 is a coupling contactor in the S0 size, designed for switching loads where galvanic isolation or signal-level to power-level interfacing is needed.

Switching capacity across voltages

Rated operational current varies by voltage and duty: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 0.6 A at 440 V, 27 A at 480 V, 2 A at 500 V, and 27 A at 600 V. At 230 V the rating is 5 hp. The coil pick-up and drop-out times are 19 to 21 ms DC; arcing time is 10 ms.

Frequently asked questions

What is the 3RT2027-4KF40-0RB0 used for?

It is a coupling contactor used to switch power loads under the control of a low-voltage signal, providing galvanic isolation between a control circuit and a load circuit in industrial panels.

What are the key ratings of the 3RT2027-4KF40-0RB0?

The contactor has a 24 VDC coil and is rated 27 A at 480 V and 27 A at 600 V. It is size S0, mounts on 35 mm DIN rail, and has a mechanical life of 10,000,000 operations.

Where can I buy the 3RT2027-4KF40-0RB0?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Current pricing and availability are confirmed at quote time.

MPN
3RT2027-4KF40-0RB0