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Siemens 3RT1056-6NB36 — Contactors

Siemens 3RT1056-6NB36 SIRIUS Power Contactor, S6 Frame

MPN3RT1056-6NB36
Active

Siemens SIRIUS, power contactor, 3RT1056-6NB36, S6 frame, 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

3RT1056-6NB36 — Identification
ParameterValue
Contactor frame sizeS6
3RT1056-6NB36 — 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
3RT1056-6NB36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.6
Rated value @ 50 Hz21 ... 27.3 V
3RT1056-6NB36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1056-6NB36 — 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)
3RT1056-6NB36 — 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
3RT1056-6NB36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1056-6NB36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1056-6NB36 — Mechanical
ParameterValue
Width120 mm
Height172 mm
Depth170 mm
3RT1056-6NB36 — Specifications
ParameterValue
At AC80 ... 90 ms

Product details

The contactor occupies a 172 mm height, 120 mm width, and 170 mm depth footprint, so verify the DIN rail or backplate clearance before committing the BOM line.

The magnet coil is rated 21 to 27.3 V, with a pickup of 0.8 times the rated value and a dropout of 1.1 times the full-scale value — so on a 24 VDC control bus it pulls in reliably and drops out cleanly, critical for safety circuits. Switching frequency ranges from 130 operations per hour in AC-4 duty (plugging/inching) up to 800 operations per hour in AC-1 (resistive) — the AC-3 motor rating at 750 ops/h covers most conveyor and pump applications. Auxiliary contacts are included, so no separate add-on block is needed for status feedback to the PLC.

Main power terminals accept stranded conductors from 25 to 120 mm², sized for the S6 frame's current-carrying capacity. The coil connection uses screw-type terminals accepting 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, with a maximum of 2x (0.75 to 4 mm²) — standard for control wiring in a panel. A single 9 mm mounting hole is provided for screw fixing; plan for the specified 10 mm clearance at the sides and 10 mm above/below for heat dissipation and arc flash clearance.

Environmental limits and lifecycle

Frequently asked questions

What is the depth of this contactor?

The depth is 170 mm, with a height of 172 mm and width of 120 mm.

What wire sizes does the coil terminal accept?

The screw-type coil terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, with a maximum of 2x (0.75 to 4 mm²).

What is the operating temperature range?

The operating range is -25 to +60 °C, with storage from -55 to +80 °C.

MPN
3RT1056-6NB36