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Siemens SIRIUS 3RT2018-2AP02 Power Contactor, Size S00, 9 A

Name: 3RT2018-2AP02
Brand: Siemens
SKU: 3RT2018-2AP02
Availability: LimitedAvailability
Author: Cross-Ref Carlos

MPN3RT2018-2AP02

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Siemens SIRIUS 3RT2018-2AP02 power contactor, size S00, 9 A AC-3 at 400 V, spring-type terminals, screw and snap-on mounting on 35 mm DIN rail.

$91.69Ref. price · indicative, final on quote

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Siemens 3RT2018-2AP02 datasheet (PDF)

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

Specifications

3RT2018-2AP02 — Identification
Parameter	Value
Contactor frame size	S00

3RT2018-2AP02 — Ratings & Performance
Parameter	Value
Rated operational current, AC-12, max.	10 A
Rated operational current, AC-4 @ 400 V	11.5 A
Rated value @ 400 V	3 A
Rated value @ 500 V	2 A
Rated value @ 690 V	1 A
Rated value @ 230 V	2 hp
Rated value @ 24 V	10 A
Rated value @ 60 V	2 A
Rated value @ 110 V	1 A
Rated value @ 220 V	0.3 A

3RT2018-2AP02 — Control & Coil
Parameter	Value
Control supply voltage type	AC
Rated value @ 50 Hz	0.25
Rated value @ 50 Hz	230 V

3RT2018-2AP02 — Contacts & Poles
Parameter	Value
Main poles	3
Main NO contacts	3
Auxiliary contact reliability	1 faulty switching per 100 million (17 V, 1 mA)

3RT2018-2AP02 — Protection & Coordination
Parameter	Value
Short-circuit coordination type 1, fuse	gG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA)
Short-circuit coordination type 2, fuse	gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)
Aux. switch short-circuit protection, fuse	gG: 10 A (500 V, 1 kA)

3RT2018-2AP02 — Connection & Mounting
Parameter	Value
Main circuit connection	spring-loaded terminals
Aux. / control circuit connection	spring-loaded terminals
Conductor cross-section, solid	0.5 ... 4 mm²
Conductor cross-section, solid or stranded	2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule	2x (0.5 ... 2.5 mm²)
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mounting	Yes

3RT2018-2AP02 — Durability
Parameter	Value
Durability (operating cycles, typ.)	30 000 000
Durability with aux. switch block (cycles, typ.)	10 000 000

3RT2018-2AP02 — Environmental
Parameter	Value
Operating temperature range	-25 ... +60 °C
Storage temperature range	-55 ... +80 °C
Installation altitude, max.	2 000 m

3RT2018-2AP02 — Mechanical
Parameter	Value
Width	45 mm
Height	70 mm
Depth	73 mm

3RT2018-2AP02 — Specifications
Parameter	Value
At AC	4 ... 15 ms

Product details

It carries a 9 A rated operational current in AC-3 duty at 400 V, which is the standard motor-switching rating — that's the figure that governs real-world motor starts and stops, not the higher AC-1 resistive rating. The contactor includes an integrated auxiliary switch, saving a separate aux block on the DIN rail.

The size S00 footprint — 45 mm wide, 70 mm tall, 73 mm deep — fits tightly in a crowded panel; plan for 10 mm clearance above and below and 6 mm at the sides for airflow.

The magnet coil uses spring-type terminals — no screw torque to verify, but strip length and ferrule fit matter.

Switching performance and life

Switching frequency depends on duty class: up to 1 000 cycles/hour for AC-1 (resistive), 750 cycles/hour for AC-2 and AC-3 (motor start/run), and 250 cycles/hour for AC-4 (plugging/inching).

Environmental range

Frequently asked questions

What are the key ratings for the 3RT2018-2AP02?

The key motor-switching rating is 9 A at 400 V AC-3. It also carries a 2 hp rating at 230 V. The auxiliary contact is rated 10 A at 24 V, 3 A at 400 V, and 0.2 A at 440 V. Mechanical life is 30 million operations typical.