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Siemens 3RT1055-6AP36-ZX95 — Contactors

Siemens 3RT1055-6AP36-ZX95 SIRIUS Power Contactor, 220-240 V

MPN3RT1055-6AP36-ZX95
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Siemens SIRIUS S6 power contactor, 3RT1055-6AP36-ZX95, 220-240 VAC coil, screw-type terminals, 25-120 mm² main circuit, size S6.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT1055-6AP36-ZX95 — Identification
ParameterValue
Contactor frame sizeS6
3RT1055-6AP36-ZX95 — 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
3RT1055-6AP36-ZX95 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.8
Rated value @ 50 Hz220 ... 240 V
3RT1055-6AP36-ZX95 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1055-6AP36-ZX95 — 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)
3RT1055-6AP36-ZX95 — 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
3RT1055-6AP36-ZX95 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1055-6AP36-ZX95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1055-6AP36-ZX95 — Mechanical
ParameterValue
Width120 mm
Height172 mm
Depth170 mm
3RT1055-6AP36-ZX95 — Specifications
ParameterValue
At AC40 ... 60 ms

Product details

The main power circuit accepts stranded conductors from 25 mm² up to 120 mm², which covers motor feeds up to about 55 kW at 400 V (rough rule — verify against your motor FLA). Switching frequency depends on duty: AC-1 (resistive) at 800 ops/h, AC-3 (squirrel-cage motor start/run) at 750 ops/h, AC-4 (plugging/inching) at 130 ops/h. The AC-3e rating mirrors the AC-3 figure at 750 ops/h. For a conveyor line cycling every 30 seconds, that's well within the AC-3 ceiling; for a press brake doing rapid reversals, you'll want to stay under the AC-4 limit. Auxiliary contacts are present — the built-in switch block is rated 10 A at 24 V, 2 A at 48 V and 60 V, and 1 A at 110 V.

This contactor uses screw fixing (bolt-through), not DIN-rail snap-on. Mounting surface must be vertical, with ±90° rotation allowed and ±22.5° tilt forward/back. That gives flexibility for tight enclosures, but it's not a DIN-rail part — budget for a backplate and drilled holes. Footprint: 172 mm high, 120 mm wide, 170 mm deep. That's a substantial block — size S6. Clearance requirements: 10 mm above and below, 20 mm in front, 10 mm to the sides. A standard 600x600 mm enclosure can hold a few of these side by side, but watch the depth if the panel door has a deep component (like a disconnect handle) behind the contactor.

Wiring and terminations

Main power terminals accept stranded 25-120 mm² — that's a single large conductor or two smaller ones. The auxiliary circuit terminals are screw-type as well, accepting 2x (0.5-1.5 mm²) solid or 2x (0.75-2.5 mm²) stranded, max 2x (0.75-4 mm²). Use ferrules on stranded auxiliary wires to avoid strand spread under the screw. Operating delay is 40-60 ms on both AC and DC coil pickup — consistent, not unusually fast. Arcing time is 10-15 ms, which is typical for this frame size. For the coil, the rated value of 0.8 power factor at 50/60 Hz means the inrush current is moderate; the initial value is also 0.8. No suppression built in — add a varistor or RC snubber across the coil if driving from a PLC output.

Frequently asked questions

What is the closest functional second-source for this contactor?

The peer 3RT1055-6AU36 is a close functional match — same S6 frame, same coil voltage family, same main conductor range. The difference is in the auxiliary contact configuration and any special ZX95 options (e.g., special packaging, customer-specific marking). If your panel was built around 3RT1055-6AU36, the ZX95 variant should drop in mechanically, but verify the auxiliary contact count matches your control circuit.

What are the key dimensions for panel layout?

Height 172 mm, width 120 mm, depth 170 mm. Clearance: 10 mm above/below, 20 mm in front, 10 mm to sides. Mounting by screw fixing on a vertical surface with ±90° rotation and ±22.5° tilt allowed.

What conductor sizes does the main and auxiliary circuit accept?

Main circuit: stranded 25-120 mm². Auxiliary circuit: solid 2x (0.5-1.5 mm²), stranded 2x (0.75-2.5 mm²), max 2x (0.75-4 mm²). All terminals are screw-type.

MPN
3RT1055-6AP36-ZX95