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Siemens 3RT2018-1AH02 — Contactors

Siemens 3RT2018-1AH02 SIRIUS Power Contactor, Size S00, 24 V

MPN3RT2018-1AH02
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Siemens SIRIUS 3RT2018-1AH02 power contactor, Size S00, 24 VDC coil, screw terminals, 10 A rated at 24 V, auxiliary switch included, DIN rail mount.

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

3RT2018-1AH02 — Identification
ParameterValue
Contactor frame sizeS00
3RT2018-1AH02 — 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
3RT2018-1AH02 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz48 V
3RT2018-1AH02 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2018-1AH02 — 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)
3RT2018-1AH02 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid0.5 ... 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 60715
Side-by-side mountingYes
3RT2018-1AH02 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2018-1AH02 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2018-1AH02 — Mechanical
ParameterValue
Width45 mm
Height58 mm
Depth73 mm
3RT2018-1AH02 — Specifications
ParameterValue
At AC4 ... 15 ms

Product details

The 10 A rating at 24 VDC is the headline figure for this Size S00 frame. This is the contactor's rated operational current for DC-1 (resistive) loads at that voltage — meaning it can switch a 24 VDC resistive circuit up to 10 A continuously. For DC motor or inductive loads, the switching capacity derates significantly: 2 A at 48 V, 0.3 A at 220 V, and 0.2 A at 440 V, so verify the load type and voltage against these curves before specifying. Switching frequency limits are given per duty class: up to 1,000 operations per hour for AC-1 (resistive), 750/h for AC-2 and AC-3 (motor starting), and 250/h for AC-4 (plugging/inching). These are mechanical endurance limits for the contactor's design; exceeding them accelerates wear on the main contacts. The contactor accepts solid or stranded conductors from 0.5 to 4 mm², with dual-wire capability for 2x 0.5...1.5 mm² or 2x 0.75...2.5 mm². This covers most panel wiring sizes for control circuits and smaller motor loads.

The Size S00 footprint — 45 mm wide, 58 mm high, 73 mm deep — fits standard 45 mm modular spacing, leaving room for auxiliary contact blocks alongside.

Frequently asked questions

What are the key ratings for this contactor?

The main contact is rated 10 A at 24 VDC. It accepts wire sizes from 0.5 to 4 mm² solid or stranded, and mounts on a 35 mm DIN rail. The Size S00 frame measures 45 mm wide by 58 mm high by 73 mm deep.

Does this contactor include an auxiliary switch?

Yes, an auxiliary switch is included as standard on this model. It can be used for status feedback or interlocking in the control circuit.

What clearance is needed around this contactor?

Minimum clearance requirements are 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm to the side. The mounting position is flexible with ±180° rotation and ±22.5° tilt allowed.

MPN
3RT2018-1AH02