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Siemens 3RT2038-1AU00 — Contactors

Siemens 3RT2038-1AU00 SIRIUS Power Contactor

MPN3RT2038-1AU00
Active

Siemens SIRIUS S2 power contactor, 3RT2038-1AU00, 65 A at 480 V AC-3, screw-type coil terminals, screw and snap-on 35 mm DIN-rail mount.

Siemens 3RT2038-1AU00 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RT2038-1AU00 — Identification
ParameterValue
Contactor frame sizeS2

Ratings & Performance

3RT2038-1AU00 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V55 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V15 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A

Control & Coil

3RT2038-1AU00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.37
Rated value @ 50 Hz240 V

Contacts & Poles

3RT2038-1AU00 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)

Protection & Coordination

3RT2038-1AU00 — 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: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)

Connection & Mounting

3RT2038-1AU00 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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

Durability

3RT2038-1AU00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000

Environmental

3RT2038-1AU00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m

Mechanical

3RT2038-1AU00 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm

Specifications

3RT2038-1AU00 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

Integrator's spec read

The Siemens 3RT2038-1AU00 is a SIRIUS S2-frame power contactor rated 65 A at 480 V AC-3 — that is the motor-switching current, not the resistive-heater rating, so size your overload relay for the motor FLA, not this contactor's maximum. Coil connection uses screw-type terminals; the main and auxiliary contacts are also screw-terminated, accepting 2x (0.5 to 1.5 mm²) solid or stranded on the control side.

Duty cycle and thermal limits

Rated for 500 switching cycles per hour in both AC-3 and AC-3e duty — that is the standard motor-starting profile across pumps, fans, and compressors. AC-4 (plugging/reversing) drops to 150 cycles/hour; AC-1 (resistive) allows 700 cycles/hour.

Frequently asked questions

Can 3RT2038-1AU00 handle AC-3e applications?

Yes, the contactor is rated for AC-3e duty at 500 switching cycles per hour maximum, matching the AC-3 rating. This covers standard motor starting for inverter-fed or direct-on-line loads within that profile.

MPN
3RT2038-1AU00