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Siemens 3RT2018-2AP01 — Contactors

Siemens 3RT2018-2AP01 SIRIUS Power Contactor, Size S00, 24 V

MPN3RT2018-2AP01
Active

Siemens SIRIUS power contactor, 3RT2018-2AP01, size S00, 3-pole, 24 VDC coil, spring-type terminals, screw and snap-on DIN rail mounting, with auxiliary switch.

$26.67Ref. price · indicative, final on quote
Siemens 3RT2018-2AP01 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2018-2AP01 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-2AP01 — 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
3RT2018-2AP01 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz230 V
3RT2018-2AP01 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2018-2AP01 — 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)
3RT2018-2AP01 — 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2018-2AP01 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-2AP01 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-2AP01 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RT2018-2AP01 — Specifications
ParameterValue
At AC4 ... 15 ms

Product details

It carries a 24 VDC coil with spring-type terminals and includes an integrated auxiliary switch for status feedback or interlocking. Rated for 2 hp at 230 V, this contactor handles typical 3-phase motor applications up to that power level. The main contacts are rated for 20 to 12 A depending on the duty cycle (AC-1 through AC-4), with maximum switching frequencies ranging from 250 operations per hour under AC-4 to 1000 per hour under AC-1. The auxiliary contact block provides additional switching capacity for control circuits: rated 10 A at 24 V, 3 A at 400 V, and 2 A at 48/60 V, among other values. This allows direct feedback to a PLC or relay without an extra interface module.

The spring-type coil terminals are tool-less — strip, push, done. No torque driver needed for the coil connection.

Rated for 50/60 Hz operation at 0.25 A control supply. These numbers matter when coordinating with fast-acting PLC outputs or safety relays.

Frequently asked questions

What is the closest functional alternative if I cannot source this exact part?

The 3RT2026-1AG20 is a peer in the same SIRIUS family and S00 frame size, but with a different coil voltage (230 VAC vs 24 VDC). It will not drop in without changing the coil supply. For a 24 VDC coil replacement, verify the coil rating matches — the 3RT2024-2BB40 uses a different coil voltage as well. Always confirm the coil voltage before substituting.

What are the key dimensions for panel layout?

Width 45 mm, height 70 mm, depth 73 mm. Clearance: 10 mm above, below, and in front; 6 mm on each side.

What wire sizes does the contactor accept?

Solid or stranded conductors from 0.5 to 4 mm², single or two conductors per terminal (2x 0.5–4 mm²).

Will this contactor fit a panel designed for the 3RT2026-1AG20?

Mechanically yes — both are S00 size with the same DIN rail footprint and clearance requirements. The difference is the coil voltage: this unit is 24 VDC, while the 3RT2026-1AG20 is 230 VAC. Verify your control voltage before swapping.

MPN
3RT2018-2AP01