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Siemens 3RT2518-1BB40 — Contactors

Siemens 3RT2518-1BB40 SIRIUS Contactor, 24V Coil, Size S00

MPN3RT2518-1BB40
Active

Siemens SIRIUS contactor, size S00, 24 V AC/DC coil, screw-type terminals, auxiliary switch rated 10 A at 24 V.

$44.45Ref. price · indicative, final on quote
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

3RT2518-1BB40 — Identification
ParameterValue
Contactor frame sizeS00
3RT2518-1BB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 230 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2518-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2518-1BB40 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts2
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2518-1BB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 35 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegG: 20A (690V, 100kA)
Aux. switch short-circuit protection, fusefuse gG: 10 A
3RT2518-1BB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type 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 ... 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 DIN rail according to DIN EN 50022
Side-by-side mountingYes
3RT2518-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2518-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2518-1BB40 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm
3RT2518-1BB40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It's a current-production unit, so no end-of-life surprise for a lineside spare.

Side-by-side contactors need 6 mm spacing between units – no extra gap at top, bottom, front, or back (zero clearance for those planes). Wire range for main and auxiliary circuits: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid/stranded.

Comparison to 3RT2028-1BB40

Both are S00-frame SIRIUS contactors with 24 V screw terminals. The 3RT2518-1BB40 is the newer-generation offering; the 3RT2028-1BB40 is its direct predecessor. Mounting, wire range, and auxiliary contact capacity are identical per the published specs. If your BOM calls the older code, this one drops into the same panel slot without rewiring – but confirm the auxiliary switch count (this one includes a built-in auxiliary, the earlier may have been ordered without).

Frequently asked questions

What is the depth of this contactor?

73 mm depth, 45 mm width, 57.5 mm height.

What wire sizes does it accept?

Screw terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid or stranded.

Will it drop into a panel designed for 3RT2028-1BB40?

Yes, same S00 frame, same mounting and wiring. Just verify the auxiliary switch configuration matches what the panel expects.

MPN
3RT2518-1BB40