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Siemens 3RT2018-2LB42-0LA0 — Contactors

Siemens SIRIUS 3RT2018-2LB42-0LA0 Power Contactor, 24 VDC, S

MPN3RT2018-2LB42-0LA0
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Siemens SIRIUS 3RT2018-2LB42-0LA0 power contactor, Size S00, 24 VDC coil, spring-type terminals, 45 mm width, current production.

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

3RT2018-2LB42-0LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-2LB42-0LA0 — 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
3RT2018-2LB42-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2018-2LB42-0LA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2018-2LB42-0LA0 — 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)
3RT2018-2LB42-0LA0 — 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
3RT2018-2LB42-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-2LB42-0LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-2LB42-0LA0 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth121 mm

Product details

Coil and auxiliary contact ratings

The 3RT2018-2LB42-0LA0: The 24 VDC coil is rated for 10 A at 24 V on the auxiliary contacts — that's the contact rating for a DC-13 load at that voltage. For a packaging machine OEM, this means the auxiliary contacts can switch a 24 VDC PLC input or solenoid valve directly without an interposing relay, as long as the inrush stays under 10 A.

The lifecycle status is current — no phase-out or NRND flag. This is a qualified part for serial production; no requalification needed if it's already on your BOM.

Frequently asked questions

What are the key dimensions for panel layout?

Width is 45 mm, height 70 mm, depth 121 mm. Clearance requirements: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the side.

What conductor sizes does the spring terminal accept?

Solid conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), 2x 4 mm². Stranded: 2x (0.5... 4 mm²).

What is the auxiliary contact rating at 24 VDC?

The auxiliary contacts are rated for 10 A at 24 VDC.

MPN
3RT2018-2LB42-0LA0