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Siemens 3RT2018-2KB42-0LA0 — Contactors

Siemens 3RT2018-2KB42-0LA0 SIRIUS Power Contactor, 24 VDC, S

MPN3RT2018-2KB42-0LA0
Active

Siemens SIRIUS power contactor, 3RT2018-2KB42-0LA0, size S00, 24 VDC coil, spring-type terminals, 45 mm wide, screw and snap-on 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

3RT2018-2KB42-0LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-2KB42-0LA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V11.5 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V2 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2018-2KB42-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2018-2KB42-0LA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2018-2KB42-0LA0 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA)
Short-circuit coordination type 2, fusegG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2018-2KB42-0LA0 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2018-2KB42-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-2KB42-0LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-2KB42-0LA0 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth121 mm

Product details

The 24 VDC coil holds at nominal voltage; dropout characteristics follow the DC curve typical of SIRIUS contactors. The spring-type terminals accept a range of conductor cross-sections: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and 2x 4 mm², which covers most control-circuit wiring in a standard panel. These matter for arc flash and heat dissipation — respect them in your layout.

No adapter plate needed — it clips directly onto the rail and secures with the screw for vibration resistance. The spring-type terminals reduce wiring time: strip to the required length, push in, done.

Frequently asked questions

What are the key dimensions for panel layout?

Width 45 mm, height 70 mm, depth 121 mm. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the side.

What conductor sizes does the spring terminal accept?

It accepts 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and 2x 4 mm² solid or stranded conductors.

Does it drop into a panel designed for 3RT2018-2AB02-ZX95?

The physical footprint (size S00, 45 mm width, DIN-rail mount) is the same, but the coil voltage differs — this unit is 24 VDC, while the -2AB02 variants are typically AC coils. Check the coil supply before swapping; wiring terminals are spring-type on both, so no rewiring of the power circuit is needed if the coil voltage matches.

MPN
3RT2018-2KB42-0LA0