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Siemens 3RT1066-6AU36 — Contactors

Siemens 3RT1066-6AU36 SIRIUS Power Contactor, Size S10, Scre

MPN3RT1066-6AU36
Active

Siemens SIRIUS power contactor, Size S10, screw-type magnet coil terminals, 3RT1066-6AU36.

Siemens 3RT1066-6AU36 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT1066-6AU36 — Identification
ParameterValue
Contactor frame sizeS10
3RT1066-6AU36 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V280 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1066-6AU36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.9
Rated value @ 50 Hz240 ... 277 V
3RT1066-6AU36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1066-6AU36 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 500 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegG: 400 A (690 V, 100 kA), aM: 315 A (690 V, 50 kA), BS88: 400 A (415 V, 50 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT1066-6AU36 — Connection & Mounting
ParameterValue
Main circuit connectionConnection bar
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, solid or stranded2x (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²), max. 2x (0,75 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew fixing
Side-by-side mountingYes
3RT1066-6AU36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1066-6AU36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1066-6AU36 — Mechanical
ParameterValue
Width145 mm
Height210 mm
Depth202 mm
3RT1066-6AU36 — Specifications
ParameterValue
At AC40 ... 80 ms

Product details

Siemens 3RT1066-6AU36 — SIRIUS Size S10 Power Contactor

It is screw-fixed to the mounting surface, not DIN-rail snapped — plan for a dedicated backplate or sub-panel with four 11 mm holes on a 145 mm × 210 mm footprint. The magnet coil uses screw-type terminals, and the main power circuit accepts stranded cable from 70 mm² up to 240 mm² — sized for high-current feeds typical of 200+ A motor branches. Auxiliary contacts are included, with a 24 V rated switching capacity of 10 A.

Duty Cycles and Switching Frequency

This contactor's maximum switching rate depends on the utilization category: 750 operations per hour in AC-1 (resistive), 500 in AC-3 (squirrel-cage motor starting), 250 in AC-2 (slip-ring motor), and 130 in AC-4 (plugging/inching). For AC-3e applications the rate matches AC-3 at 500 ops/h.

Mounting and Environmental Range

Frequently asked questions

Where can I buy 3RT1066-6AU36 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Submit an RFQ for current availability and pricing — confirmed at quote time.

What is 3RT1066-6AU36's listed depth?

The depth is 202 mm, with a width of 145 mm and height of 210 mm.

What compliance documentation is available for 3RT1066-6AU36?

As a Siemens SIRIUS product, it carries CE marking and is designed to IEC/EN 60947-4-1 standards. RoHS and REACH declarations are available from Siemens documentation. No specific UL/CSA listing is recorded in this evidence set.

MPN
3RT1066-6AU36