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Siemens 3RT2018-2BB42-0CC0 — Contactors

Siemens 3RT2018-2BB42-0CC0 SIRIUS Power Contactor, Size S00,

MPN3RT2018-2BB42-0CC0
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Siemens SIRIUS power contactor, 3RT2018-2BB42-0CC0, size S00, 24 V DC coil, spring-type terminals, 12 A main contact rating.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2018-2BB42-0CC0 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-2BB42-0CC0 — 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
3RT2018-2BB42-0CC0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2018-2BB42-0CC0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2018-2BB42-0CC0 — 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)
3RT2018-2BB42-0CC0 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid0.5 ... 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 standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2018-2BB42-0CC0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-2BB42-0CC0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-2BB42-0CC0 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Product details

It is rated for a main contact operational current of 12 A, with the coil drawing 24 V DC. The contactor uses spring-type terminals for the magnet coil connection, and its auxiliary switch is integrated.

The 12 A main contact rating (at AC-3 duty, typical for motor switching) tells you this contactor can handle a 3-phase motor up to roughly 5.5 kW at 400 V — a common size for small pumps, fans, or conveyors. The auxiliary contact ratings span from 10 A at 24 V DC down to 0.3 A at 220 V DC, so it can switch control signals or small DC loads in the same panel. The mechanical switching frequency is rated up to 1000 operations per hour at AC-1 (resistive), 750 at AC-2 and AC-3 (motor starting/running), and 250 at AC-4 (plugging/inching). For high-duty-cycle applications like indexing conveyors, the AC-4 limit is the one to watch — it governs how often you can reverse or jog the motor without overheating the contacts.

This contactor class is used in industrial control panels for switching motors, heaters, and other loads under the control of a PLC or manual switch. The size S00 frame is typical for small to medium motor starters in machinery, conveyors, and HVAC equipment. The spring-type terminals speed up wiring — no screwdriver needed for the coil connection, which is a time-saver on repetitive panel builds.

Frequently asked questions

What are the main contact ratings?

The main contacts are rated for an operational current of 12 A, with the exact duty category (AC-3, AC-1, etc.) determining the switching frequency and life.

What is the coil voltage and connection type?

The coil is rated for 24 V DC and uses spring-type terminals for fast, tool-less wiring.

What are the physical dimensions and mounting requirements?

The contactor is 45 mm wide, 70 mm high, and 73 mm deep. It mounts on a 35 mm DIN rail per DIN EN 60715, with clearance distances of 10 mm in most directions and 6 mm at the sides.

MPN
3RT2018-2BB42-0CC0