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Siemens 3RT2024-4BB40 — Contactors

Siemens 3RT2024-4BB40 SIRIUS Power Contactor, 24 VDC Coil, S

MPN3RT2024-4BB40

Siemens SIRIUS power contactor, 3RT2024-4BB40, size S0, 24 VDC coil, screw and snap-on mounting onto 35 mm DIN rail.

Siemens 3RT2024-4BB40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2024-4BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2024-4BB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V12.5 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V2 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2024-4BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2024-4BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2024-4BB40 — 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)
3RT2024-4BB40 — 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2024-4BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2024-4BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2024-4BB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

The 24 VDC coil is rated with an operating range of 0.8 to 1.1 times the rated value. The coil connection uses a ring cable lug.

Switching performance and operating cycle

Rated for 1 000 operating cycles per hour under AC-1, AC-2, AC-3, and AC-3e duty, and 300 cycles per hour under the heavier AC-4 category (frequent inching or plugging). The arcing time is 10 ms, which is tight enough that the contactor can be used in applications where the arc must extinguish quickly to avoid nuisance tripping of upstream protection.

Environmental limits and auxiliary contacts

Frequently asked questions

What are the key dimensions for panel layout?

Width 45 mm, height 85 mm, depth 107 mm. Minimum clearances: 10 mm upwards/forwards/downwards, 6 mm at the sides.

What coil voltage and connection type does this contactor use?

24 VDC coil with a ring cable lug connection. The operating range is 0.8 to 1.1 times the rated value.

What is the maximum switching frequency?

1 000 operating cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty; 300 cycles per hour for AC-4.

Does this contactor include an auxiliary switch?

Yes, it comes with an auxiliary switch built in.

MPN
3RT2024-4BB40