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Siemens 3RT2024-1BB40 — Contactors

Siemens 3RT2024-1BB40 SIRIUS Power Contactor, 24 VDC, Size S

MPN3RT2024-1BB40
Active

Siemens SIRIUS 3RT2024-1BB40 power contactor, Size S0, 24 VDC coil, screw terminals, 45 mm wide, 107 mm deep.

$108.27 – $224.05Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT2024-1BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2024-1BB40 — 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
3RT2024-1BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2024-1BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2024-1BB40 — 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)
3RT2024-1BB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid1 ... 10 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
3RT2024-1BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2024-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2024-1BB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

The Siemens SIRIUS 3RT2024-1BB40 is a Size S0 power contactor with a 24 VDC coil, screw-type coil terminals, and a rated operational current of 16 A for main contacts in AC-3 duty. The auxiliary switch is included.

The AC-3 rating of 16 A at 400 V governs motor switching — this is the figure that decides whether the contactor handles a given three-phase induction motor. The DC-13 rating at 24 V is 10 A, dropping to 3 A at 400 V DC; for DC load switching, the voltage-specific value is the binding limit. Coil pickup is guaranteed between 0.8 and 1.1 times the rated voltage (24 VDC), so the coil pulls in reliably at 19.2 VDC and holds above dropout. Dropout time on DC is 15 to 18 ms.

Wiring and clearance notes

Wire cross-section for solid or stranded is 1 to 10 mm²; fine-stranded with ferrule is 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). Arcing time is 10 ms.

Frequently asked questions

What is the closest functional second-source — 3RT2024-2BB40?

The 3RT2024-2BB40 is the same Size S0 contactor with a 24 VDC coil but uses spring-type terminals instead of screw-type. It drops into the same panel footprint and wiring pattern — no rewiring needed if the terminal type is acceptable.

What is the listed depth of 3RT2024-1BB40?

The depth is 107 mm.

What is the wire cross-section range for solid conductors?

Solid conductors: 1 to 10 mm².

Will 3RT2024-1BB40 drop into a panel specified around 3RT2024-2BB40 without rewiring?

Yes — both are Size S0, 45 mm wide, with the same mounting and clearance requirements. The only difference is the coil terminal type: screw-type on the 1BB40, spring-type on the 2BB40. The wiring pattern is identical.

What compliance documentation does this brand provide for 3RT2024-1BB40?

As a Siemens SIRIUS product, it is typically supplied with RoHS and REACH declarations and carries IEC and UL certifications. Specific document numbers are not listed in this record.

MPN
3RT2024-1BB40