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Siemens 3RT2027-4VB40 — Contactors

Siemens 3RT2027-4VB40 SIRIUS Coupling Contactor, S0, 27 A at

MPN3RT2027-4VB40

Siemens SIRIUS coupling contactor, size S0, order code 3RT2027-4VB40, rated 27 A at 480/600 V, screw and snap-on 35 mm DIN rail.

Siemens 3RT2027-4VB40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2027-4VB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-4VB40 — 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
3RT2027-4VB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-4VB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-4VB40 — 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)
3RT2027-4VB40 — 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
3RT2027-4VB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-4VB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-4VB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

The Siemens 3RT2027-4VB40 is a SIRIUS coupling contactor in size S0, built for switching loads in control panels where you need a compact, DIN-rail-mounted interface between a control circuit and a power circuit. It carries a 27 A rating at both 480 V and 600 V — that's the continuous current it can handle in AC-3 motor duty, so it's sized for moderate motor loads like pumps, small conveyors, or fans up to about 5 hp at 230 V.

Switching ratings and coil

Coil is 24 V DC rated. The magnet coil connection uses a ring cable lug — plan for that termination when wiring. Switching frequency varies by duty: up to 1,000 operations per hour at AC-1 (resistive), 750 ops/h at AC-2 and AC-3 (motor starting and running), and 250 ops/h at AC-4 (plugging/inching). The auxiliary switch is not included — this is a bare contactor.

Frequently asked questions

What are the key electrical ratings?

Rated 27 A at both 480 V and 600 V. Coil is 24 V DC. Switching capacity at 230 V is 5 hp. Contact ratings at 24 V DC are 10 A.

What are the physical dimensions?

Width 45 mm, height 85 mm, depth 107 mm. It is size S0 and mounts on 35 mm DIN rail.

Does it include an auxiliary contact block?

No, the auxiliary switch is not included — this is a basic contactor without add-on blocks.

MPN
3RT2027-4VB40