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Siemens 3RT1055-2AR36 — Contactors

Siemens 3RT1055-2AR36 SIRIUS Power Contactor, S6, 440-480 V

MPN3RT1055-2AR36
Active

Siemens SIRIUS power contactor, size S6, order code 3RT1055-2AR36, 440-480 V AC coil, screw fixing, 170 mm depth, 120 mm width, 172 mm height.

$240.03Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT1055-2AR36 — Identification
ParameterValue
Contactor frame sizeS6
3RT1055-2AR36 — 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
3RT1055-2AR36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.8
Rated value @ 50 Hz440 ... 480 V
3RT1055-2AR36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1055-2AR36 — 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)
3RT1055-2AR36 — Connection & Mounting
ParameterValue
Main circuit connectionConnection bar
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.25 ... 2.5 mm²)
Conductor cross-section, solid or stranded2x (0,25 ... 2,5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.25 ... 1.5 mm²)
Mounting methodscrew fixing
Side-by-side mountingYes
3RT1055-2AR36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1055-2AR36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1055-2AR36 — Mechanical
ParameterValue
Width120 mm
Height172 mm
Depth170 mm
3RT1055-2AR36 — Specifications
ParameterValue
At AC40 ... 60 ms

Product details

It carries a 440-480 V AC coil, so it pulls in reliably on standard 400-480 V three-phase control transformers common across European and North American line voltages. The screw-fixing mount and the ±90° rotatable, ±22.5° tiltable vertical mounting surface give panel builders flexibility when laying out a crowded enclosure — you can orient the contactor to fit cable entry or busbar runs without a special adapter plate.

The S6 frame is Siemens' designation for a contactor body that handles the mechanical and thermal demands of switching loads up to the AC-3 duty cycle ratings. The 440-480 V coil means this contactor is not for 24 VDC or 110 VAC control circuits — it is sized specifically for higher-voltage control schemes, common where the control transformer feeds directly from the line side of a motor starter. The 170 mm depth and 172 mm height with 120 mm width define the panel footprint: at 170 mm deep, it needs a back-panel clearance of roughly 200 mm to the enclosure door for arc-flash and wiring bend radius. The solid conductor range of 2x 0.25-2.5 mm² on the coil terminals is fine for standard control wiring; the main power terminals accept stranded 25-120 mm², which covers the cable sizes for motor circuits up to the S6 current rating.

Mounting is by screw fixing — no DIN-rail clip on this S6 frame, so plan for four M6 or M8 bolts into a backplate. The auxiliary switch is included — no separate add-on needed for basic status feedback. The spring-type coil terminals accept the 0.25-2.5 mm² solid or stranded control wiring without needing a screwdriver for the coil connection.

Frequently asked questions

What are the key dimensions of 3RT1055-2AR36?

The contactor measures 170 mm depth, 120 mm width, and 172 mm height.

What coil voltage does 3RT1055-2AR36 use?

The coil is rated for 440-480 V AC, so it is designed for higher-voltage control circuits, not 24 VDC or 110 VAC.

Will 3RT1055-2AR36 drop into a panel specified for 3RT1055-1AB36?

The mechanical footprint (S6 frame, screw fixing, same mounting clearances) is identical, but the coil voltage differs: this is 440-480 V AC versus the 1AB36's DC coil. If the panel's control transformer supplies AC at that voltage, it fits without rewiring; if the panel uses DC control, it will not pull in.

How do I get current pricing and availability for 3RT1055-2AR36?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

MPN
3RT1055-2AR36