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Siemens 3RT1056-6LA06 — Contactors

Siemens 3RT1056-6LA06 SIRIUS S6 Power Contactor, 170 mm dept

MPN3RT1056-6LA06
Active

Siemens SIRIUS, power contactor, 3RT1056-6LA06, size S6, screw fixing, 172 x 120 x 170 mm.

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

3RT1056-6LA06 — Identification
ParameterValue
Contactor frame sizeS6
3RT1056-6LA06 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V160 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V30 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1056-6LA06 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1056-6LA06 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 355 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegG: 315 A (690 V, 100 kA), aM: 200 A (690 V, 50 kA), BS88: 315 A (415 V, 50 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT1056-6LA06 — 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
3RT1056-6LA06 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1056-6LA06 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1056-6LA06 — Mechanical
ParameterValue
Width120 mm
Height172 mm
Depth170 mm
3RT1056-6LA06 — Specifications
ParameterValue
At AC40 ... 60 ms

Product details

It is screw-fixed to a mounting surface, with a vertical mounting surface that can be rotated ±90° or tilted ±22.5° forward and back, giving flexibility in enclosure layout. The contactor carries an auxiliary switch and the coil terminates on screw-type terminals.

The AC-3 switching frequency is rated at 750 operations per hour (AC-3e same), which governs typical motor start-stop cycles; AC-4 (plugging/reversing) drops to 130 operations per hour. For resistive loads (AC-1) the contactor manages 800 operations per hour. These figures define the thermal duty cycle — exceeding them risks contact welding or premature wear. The mechanical endurance is 10,000,000 operations typical, so the limiting factor in most applications will be electrical life under load, not the mechanism. The main power circuit accepts stranded cable from 25 to 120 mm², sized for the S6 frame's current-carrying capacity. Auxiliary and control wiring uses solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). The auxiliary contact ratings are given per voltage — at 24 V it carries 10 A, at 230 V it carries 0.3 A — so confirm the control voltage and load current against these values for the specific aux contact being used. These are consistent with a contactor of this size and class; they matter for coordination with upstream short-circuit protection devices.

The contactor measures 172 mm high, 120 mm wide, and 170 mm deep. It is fastened with a single 9 mm diameter hole. These are minimum air gaps to maintain rated insulation and thermal dissipation — plan the enclosure layout accordingly, especially when grouping multiple contactors. The storage figure covers handling and warehousing, not running conditions. If the panel ambient exceeds 60 °C, derating or forced ventilation is required.

Frequently asked questions

What are the key dimensions for panel layout?

The contactor is 172 mm high, 120 mm wide, and 170 mm deep. It requires a single 9 mm mounting hole and minimum clearances of 10 mm upwards, 10 mm downwards, 20 mm forwards, and 10 mm at the sides.

What wire sizes does the main power circuit accept?

The main power terminals accept stranded cable from 25 mm² up to 120 mm². Auxiliary and control terminals accept solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²).

What is the switching frequency for motor duty?

For AC-3 duty (starting/running motors), the maximum is 750 operations per hour. For AC-4 duty (plugging/reversing), it is 130 operations per hour. For resistive loads (AC-1), it is 800 operations per hour.

MPN
3RT1056-6LA06