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Siemens 3RT2046-1AC20 — Contactors

Siemens 3RT2046-1AC20 SIRIUS S3 Power Contactor, 70 mm wide

MPN3RT2046-1AC20
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Siemens SIRIUS, S3 power contactor, 3RT2046-1AC20, screw-type terminals, 70 mm width, 152 mm depth, 140 mm height, screw and snap-on mounting for 35 mm DIN rail.

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

Specifications

3RT2046-1AC20 — Identification
ParameterValue
Contactor frame sizeS3
3RT2046-1AC20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V80 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V20 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2046-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.35
Rated value @ 50 Hz24 V
3RT2046-1AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2046-1AC20 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 160 A (690 V, 100 kA), aM: 100 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2046-1AC20 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2046-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2046-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2046-1AC20 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2046-1AC20 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward — useful when panel layout forces an unconventional orientation. Solid conductor range is 2.5... 16 mm² (stranded 6... 70 mm² for the main circuit), so it accepts standard panel wire sizes without adapters.

Mechanical and electrical endurance

Mechanical life is typical 10,000,000 operations. Main contact switching rates vary by duty: AC-1 (resistive) up to 900 cycles/hour, AC-3 (motor start/run) up to 850 cycles/hour, AC-4 (plugging/inching) up to 250 cycles/hour. The arcing time is 10...20 ms at AC — fast enough to minimize contact wear in repetitive cycling. Auxiliary switch is included (yes), and the contactor is rated for 10 A at 24 V (auxiliary contacts), 3 A at 400 V, and 20 hp at 230 V — so it handles both control and moderate motor loads directly.

Clearance requirements: 10 mm upwards, 10 mm downwards, 20 mm forwards, 10 mm at the side — so a typical 70 mm wide contactor needs at least 90 mm horizontal slot when side-by-side with other devices. The screw-type terminals accept solid 2.5...16 mm² or stranded 6...70 mm², and the auxiliary terminal accepts 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) solid or stranded.

Frequently asked questions

What is the depth of 3RT2046-1AC20?

The depth is 152 mm — this is the dimension from the DIN rail mounting surface to the furthest front projection, critical for enclosure depth planning.

What wire sizes does the 3RT2046-1AC20 accept?

Solid conductors: 2.5... 16 mm²; stranded conductors: 6... 70 mm². Auxiliary terminals accept 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) solid or stranded.

MPN
3RT2046-1AC20