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Siemens 3RT2027-2XB40-0LA2 — Contactors

Siemens 3RT2027-2XB40-0LA2 SIRIUS Power Contactor, 24 V DC,

MPN3RT2027-2XB40-0LA2
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Siemens SIRIUS 3RT2027-2XB40-0LA2, Size S0 power contactor, 24 V DC coil, spring-type terminals, screw and snap-on 35 mm DIN rail mounting.

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

3RT2027-2XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-2XB40-0LA2 — 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
3RT2027-2XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-2XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2027-2XB40-0LA2 — 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)
3RT2027-2XB40-0LA2 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (1 ... 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
3RT2027-2XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-2XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-2XB40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth107 mm

Product details

The main contacts are rated for AC-3 switching at up to 750 operating cycles per hour, with AC-4 limited to 250 cycles/h. An auxiliary switch is built in, rated for 10 A at 24 V DC, derating to 0.3 A at 220 V DC.

Dimensions are 102 mm high, 45 mm wide, 107 mm deep — the standard S0 footprint.

Wiring practice note

Main contact terminals accept solid conductors 2x (1... 10 mm²) or stranded 2x (0.5... 2.5 mm²). The coil uses spring-type terminals — no screw torque to verify, but ensure the stripped length is correct for the cage clamp. Inrush current peak is 3 A at 24 V DC coil pickup. Arcing time is 10... 10 ms; for DC switching, the arc extinguishes in 30... 50 ms.

Frequently asked questions

What are the key ratings for this contactor?

It is a Size S0 power contactor with a 24 V DC coil and spring-type terminals. Main contacts are rated for AC-3 switching at 750 cycles/h maximum. The built-in auxiliary switch handles 10 A at 24 V DC, derating to 0.3 A at 220 V DC. Mechanical life is 10 million operations typical.

What are the mounting dimensions and clearances?

Dimensions are 102 mm high, 45 mm wide, 107 mm deep. Required clearances: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. Mounts on 35 mm DIN rail per DIN EN 60715 or via screws.

What wire sizes does the main contact terminal accept?

Solid conductors: 2x (1... 10 mm²). Stranded conductors: 2x (0.5... 2.5 mm²). The coil uses spring-type terminals.

What is the operating temperature range?

Operating temperature is -40 to +70 °C. Storage temperature is -55 to +80 °C.

MPN
3RT2027-2XB40-0LA2