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Siemens 3RT2018-4BB42 — Contactors

Siemens 3RT2018-4BB42 SIRIUS Power Contactor, Size S00, 24 V

MPN3RT2018-4BB42

Siemens SIRIUS power contactor, size S00, 3RT2018-4BB42, 24 VDC coil, screw and snap-on DIN rail mount, auxiliary switch included.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
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Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT2018-4BB42 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-4BB42 — 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
3RT2018-4BB42 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2018-4BB42 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2018-4BB42 — 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)
3RT2018-4BB42 — Connection & Mounting
ParameterValue
Main circuit connectionRing cable lug connection
Aux. / control circuit connectionring terminal lug connection
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2018-4BB42 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-4BB42 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-4BB42 — Mechanical
ParameterValue
Width45 mm
Height58 mm
Depth73 mm

Product details

It carries a 24 VDC coil and includes an auxiliary switch, so you get feedback or interlock without adding a separate block. Rated for 10 A at 24 VDC, 14 A at 480 V, and 11 A at 600 V, this contactor handles typical motor and heater circuits within those voltage bands. The AC-3 switching frequency maxes at 750 operations per hour, which is fine for most conveyor and pump duty cycles.

That helps when you're squeezing it into a crowded sub-panel or retrofitting an existing layout.

Frequently asked questions

What are the key ratings for the 3RT2018-4BB42?

It's a size S00 power contactor with a 24 VDC coil, rated 10 A at 24 V, 14 A at 480 V, and 11 A at 600 V. Auxiliary switch included. AC-3 switching frequency up to 750 operations per hour.

What is the mounting and clearance requirement?

Screw or snap-on mount on 35 mm DIN rail per DIN EN 60715. Clearances: 10 mm upwards, forwards, and downwards; 6 mm at the side. Dimensions: 45 mm wide, 58 mm tall, 73 mm deep.

MPN
3RT2018-4BB42