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Siemens 3RT2027-2KF40 — Contactors

Siemens 3RT2027-2KF40 SIRIUS Coupling Contactor, 110 V Coil,

MPN3RT2027-2KF40
Active

Siemens SIRIUS coupling contactor, Size S0, 3RT2027-2KF40, 110 V DC coil, spring-type terminals, screw and snap-on mounting for 35 mm DIN rail.

Siemens 3RT2027-2KF40 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

3RT2027-2KF40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-2KF40 — 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
3RT2027-2KF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-2KF40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-2KF40 — 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)
3RT2027-2KF40 — 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
3RT2027-2KF40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-2KF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-2KF40 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth107 mm

Product details

SIRIUS 3RT2027-2KF40 Coupling Contactor — S0 Frame, 110 V DC Coil, Spring-Terminal

The rated coil voltage is 110 V DC, with an initial pickup value of 0.7 times rated and a full-scale dropout value of 1.25 times rated. Operating times at DC are 19... 21 ms for closure and 10... 10 ms for arcing.

Switching Capacity and Duty Ratings

For DC switching, the contactor is rated at 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. At 230 V AC, the rated value is 5 hp. Maximum switching frequencies are 1,000 1/h at AC-1, 750 1/h at AC-2, 750 1/h at AC-3, 750 1/h at AC-3e, and 250 1/h at AC-4. These duty-cycle limits govern the thermal load on the contactor during repetitive operation.

Installation and Environmental Limits

Conductor cross-sections accepted: solid 1... 10 mm², stranded 1... 10 mm², and 2x (0.5... 2.5 mm²) solid or stranded. Dimensions: width 45 mm, height 102 mm, depth 107 mm.

The 3RT2027-2KF40 is at a current lifecycle stage per the manufacturer. No auxiliary switch is fitted (Auxiliary Switch: No).

Frequently asked questions

What is 3RT2027-2KF40's listed depth?

The listed depth is 107 mm.

What conductor cross-sections does the 3RT2027-2KF40 accept?

It accepts solid conductors from 1 to 10 mm², stranded from 1 to 10 mm², and 2x (0.5 to 2.5 mm²) solid or stranded.

Will 3RT2027-2KF40 drop into a panel specified around 3RT2015-2BF42 without rewiring?

Both are SIRIUS Size S0 contactors with the same DIN rail mounting footprint, so mechanical fit is identical. However, verify the coil voltage and terminal arrangement — the 3RT2027-2KF40 uses spring-type terminals and a 110 V DC coil, which may differ from the 3RT2015-2BF42.

MPN
3RT2027-2KF40