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Siemens 3RT1055-6NB36 — Contactors

Siemens 3RT1055-6NB36 SIRIUS Power Contactor, Size S6, 170mm

MPN3RT1055-6NB36
Active

Siemens SIRIUS power contactor, size S6, order code 3RT1055-6NB36, screw-type coil terminals, 25-120 mm² stranded main poles, 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

3RT1055-6NB36 — Identification
ParameterValue
Contactor frame sizeS6
3RT1055-6NB36 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V132 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
3RT1055-6NB36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.6
Rated value @ 50 Hz21 ... 27.3 V
3RT1055-6NB36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1055-6NB36 — 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)
3RT1055-6NB36 — 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
3RT1055-6NB36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1055-6NB36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1055-6NB36 — Mechanical
ParameterValue
Width120 mm
Height172 mm
Depth170 mm
3RT1055-6NB36 — Specifications
ParameterValue
At AC80 ... 90 ms

Product details

Its main power circuit accepts stranded conductors from 25 mm² up to 120 mm², so it handles the full current path for large motors or heavy feeder circuits without needing an external terminal adapter. Coil termination is screw-type, and the auxiliary switch block is included as standard, which simplifies wiring for interlocking or status feedback.

Mounting is by screw fixing onto a vertical surface, with the contactor rotatable ±90° and tiltable ±22.5° front-to-back. That flexibility helps when retrofitting into existing enclosures where the backplate is already drilled.

Frequently asked questions

What is the closest functional second-source — 3RT1055-6QF35?

The 3RT1055-6QF35 is a peer in the same SIRIUS size S6 family. The main difference is the coil voltage and terminal configuration; verify the coil rating matches your control voltage before substituting.

What is 3RT1055-6NB36's listed depth?

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

What compliance documentation is available for 3RT1055-6NB36?

As a Siemens SIRIUS product, it is designed to meet IEC/EN 60947-4-1 standards. RoHS and REACH declarations are typically included in the manufacturer's documentation package; request them with your RFQ.

MPN
3RT1055-6NB36