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Siemens 3RT2023-4XB40-0LA2 — Contactors

Siemens 3RT2023-4XB40-0LA2 SIRIUS Contactor, 24 V DC, S0 Siz

MPN3RT2023-4XB40-0LA2

Siemens SIRIUS, Size S0 contactor, 24 V DC coil, ring cable lug connection, screw and snap-on DIN rail mounting.

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

Specifications

3RT2023-4XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS0
3RT2023-4XB40-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V8.5 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V1 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2023-4XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2023-4XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2023-4XB40-0LA2 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)
Short-circuit coordination type 2, fusegG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2023-4XB40-0LA2 — Connection & Mounting
ParameterValue
Main circuit connectionRing cable lug connection
Aux. / control circuit connectionring terminal lug connection
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2023-4XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2023-4XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2023-4XB40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height91 mm
Depth107 mm

Product details

The DC coil draws a 3 A inrush peak and is rated for continuous duty across -40 to +70 °C operating ambient, with storage from -55 to +80 °C.

The DC switching ratings define the contactor's real-world load capability: at 24 V it handles 10 A, at 48 V and 60 V it drops to 2 A, at 110 V it's 1 A, at 125 V it's 0.9 A, at 220 V it's 0.3 A, at 400 V it's 3 A, at 480 V it's 7.6 A, and at 500 V it's 2 A. These are the values that govern whether this contactor can switch a given DC load — the 24 V 10 A rating is the high point, but at higher voltages the current capability falls off sharply, so always match the specific voltage on your circuit. Mechanical switching frequency is rated at 1 000 operations per hour for AC-1, AC-2, AC-3, and AC-3e duty, and 300 per hour for AC-4 duty. That means for most motor-starting applications (AC-3) you can cycle it every 3.6 seconds continuously; for plugging or inching (AC-4) the rate drops to one cycle every 12 seconds to manage contact wear. Physical fit is defined by the S0 size: 91 mm high, 45 mm wide, 107 mm deep.

Frequently asked questions

What are the key dimensions for panel fit?

The contactor is 91 mm high, 45 mm wide, and 107 mm deep. It requires 10 mm clearance upwards, forwards, and downwards, and 6 mm at the sides.

What DC loads can this contactor switch?

At 24 V DC it is rated for 10 A. At higher voltages the rating drops: 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 7.6 A at 480 V, and 2 A at 500 V.

Does it include an auxiliary switch?

Yes, the contactor is equipped with an auxiliary switch.

MPN
3RT2023-4XB40-0LA2