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Siemens 3RT6018-1AK21 — Contactors

Siemens 3RT6018-1AK21 SIRIUS Power Contactor, Size S00, 45 m

MPN3RT6018-1AK21

Siemens SIRIUS power contactor, Size S00, 3RT6018-1AK21, 45 mm width, 73 mm depth, screw-type terminals, rated 7.5 kW at 230 V and 13 kW at 400 V at 60 °C.

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

3RT6018-1AK21 — Identification
ParameterValue
Contactor frame sizeS00
3RT6018-1AK21 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT6018-1AK21 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz120 V
3RT6018-1AK21 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT6018-1AK21 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 35 A
Short-circuit coordination type 2, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 20 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT6018-1AK21 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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
3RT6018-1AK21 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT6018-1AK21 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT6018-1AK21 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth73 mm
3RT6018-1AK21 — Specifications
ParameterValue
At AC10 000 1/h

Product details

Side-by-side mounting is permitted, so multiple contactors pack tightly on the rail without mandatory spacing. Screw-type terminals on the main current circuit accept 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or 2x 4 mm² solid or stranded wire. At 40 °C ambient, minimum 4 mm² is permissible; at 60 °C, minimum 2.5 mm². The S00 footprint (45 × 57.5 × 73 mm) fits compact control panels.

Coil drive and switching performance

Coil holding current at 24 V rated value is 6 A, dropping to 1 A at 110 V, 0.3 A at 220 V, and 0.25 A at both 50 Hz and 60 Hz. At 230 V the coil draws 10 A; at 400 V it draws 3 A; at 690 V it draws 1 A. These values govern the control transformer sizing and PLC output drive capability. Rated for 10,000 switching operations per hour at AC, with AC-1 maximum at 1,000 1/h, AC-3 maximum at 750 1/h, and AC-4 maximum at 250 1/h. The mechanical endurance is 30,000,000 operations typical, so the contactor outlasts the panel in most cyclic applications.

The substance prohibition date of 05/01/2012 indicates RoHS compliance from that point.

Frequently asked questions

Where can I buy 3RT6018-1AK21 and what is the price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What are the key dimensions of 3RT6018-1AK21?

Width is 45 mm, height is 57.5 mm, and depth is 73 mm. It mounts on 35 mm DIN rail.

What compliance documentation is available for 3RT6018-1AK21?

The part carries a substance prohibition date of 05/01/2012, indicating RoHS compliance. Rated insulation voltage is 690 V, and pollution degree is 3. Standard Siemens SIRIUS documentation (datasheet, CE declaration) applies.

MPN
3RT6018-1AK21