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Siemens 3RT2018-1BG42 — Contactors

Siemens 3RT2018-1BG42 SIRIUS Power Contactor, Size S00, 45 m

MPN3RT2018-1BG42
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Siemens SIRIUS power contactor, 3RT2018-1BG42, size S00, 45 mm width, screw-type coil terminals, 24 V DC coil, auxiliary contacts rated 10 A at 24 V DC.

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

3RT2018-1BG42 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-1BG42 — 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
3RT2018-1BG42 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2018-1BG42 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2018-1BG42 — 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)
3RT2018-1BG42 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid0.5 ... 4 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2018-1BG42 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-1BG42 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-1BG42 — Mechanical
ParameterValue
Width45 mm
Height58 mm
Depth73 mm

Product details

It mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 60715, with a width of 45 mm, height of 58 mm, and depth of 73 mm — a compact footprint that fits standard enclosure layouts. An auxiliary switch is included, rated 10 A at 24 V DC, 2 A at 48 V DC, 1 A at 110 V DC, 0.9 A at 125 V DC, and 0.3 A at 220 V DC — covering common control voltages for PLC and relay logic feedback. Operating temperature range is -25 to +60 °C, storage -55 to +80 °C, with mounting position flexibility: +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward. Clearance distances required: 10 mm upwards, downwards, and forwards, 6 mm at the side — useful for panel layout planning.

Maximum switching frequency varies by duty: 1 000 operations per hour at AC-1 (resistive loads), 750/h at AC-2 and AC-3 (motor starting and running), and 250/h at AC-4 (plugging and inching). The AC-3e rating also allows 750/h. These limits govern contactor life in cyclic applications — exceeding them accelerates wear. Mechanical service life is typically 30 000 000 operations.

Frequently asked questions

What are the key dimensions for panel fit?

Width 45 mm, height 58 mm, depth 73 mm. Clearance required: 10 mm upwards, downwards, and forwards; 6 mm at the side.

What conductor sizes does the screw terminal accept?

Solid or stranded 0.5 to 4 mm², and 2x conductors from 0.5 to 1.5 mm², 0.75 to 2.5 mm², or 2x 4 mm².

What is the auxiliary contact rating at 24 V DC?

10 A at 24 V DC rated value.

What compliance documentation is available?

As a Siemens SIRIUS product, it carries CE marking and is designed to relevant IEC/EN standards for contactors. Specific certificates (UL, CSA, RoHS, REACH) should be verified against the manufacturer's declaration for the exact order code.

MPN
3RT2018-1BG42