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Siemens 3RT2025-4XB40-0LA2 — Contactors

Siemens 3RT2025-4XB40-0LA2 SIRIUS Contactor, S0, 24 VDC Coil

MPN3RT2025-4XB40-0LA2

Siemens SIRIUS 3RT2025-4XB40-0LA2 contactor, size S0, 24 VDC coil with ring cable lug connection, screw and snap-on mounting for 35 mm DIN rail.

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

Specifications

3RT2025-4XB40-0LA2 — Identification
ParameterValue
Contactor frame sizeS0
3RT2025-4XB40-0LA2 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V15.5 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V3 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2025-4XB40-0LA2 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2025-4XB40-0LA2 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
3RT2025-4XB40-0LA2 — 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)
3RT2025-4XB40-0LA2 — 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
3RT2025-4XB40-0LA2 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2025-4XB40-0LA2 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2025-4XB40-0LA2 — Mechanical
ParameterValue
Width45 mm
Height91 mm
Depth107 mm

Product details

Part Identity and Mounting

Physical Dimensions and Clearances

The contactor footprint is 45 mm wide, 91 mm high, and 107 mm deep.

Coil and Auxiliary Contact Details

The DC coil draws a 3 A inrush peak at 24 V rated value. The contactor includes an auxiliary switch, with DC switching ratings provided for various voltages: 10 A at 24 V, 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, and 2 A at 500 V. At 400 V, the auxiliary contact is rated 3 A, and at 480 V, 14 A. The drop-out delay at DC is 30 to 50 ms, and the arcing time is 10 ms. These matter for timing-critical circuits like safety interlocks or sequence logic.

Duty Ratings and Operating Conditions

Switching frequency varies by duty class: 1,000 operations per hour for AC-1, AC-2, AC-3, and AC-3e, and 300 operations per hour for AC-4. The motor horsepower rating at 230 V is 3 hp. Mechanical life is typical 10,000,000 operations.

Frequently asked questions

What are the key dimensions for panel layout?

Width is 45 mm, height is 91 mm, depth is 107 mm. Allow 10 mm clearance upwards, forwards, and downwards, and 6 mm at the sides.

What is the coil voltage and connection type?

The coil is 24 VDC, terminated with a ring cable lug connection.

MPN
3RT2025-4XB40-0LA2