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Siemens 3RT2023-2DB40 — Contactors

Siemens 3RT2023-2DB40 SIRIUS Power Contactor, 24 VDC Coil, S

MPN3RT2023-2DB40
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Siemens SIRIUS power contactor, 3RT2023-2DB40, S0 frame, 24 VDC coil, spring-type terminals, 45 mm wide, 107 mm deep.

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

Specifications

3RT2023-2DB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2023-2DB40 — 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 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2023-2DB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2023-2DB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2023-2DB40 — 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)
3RT2023-2DB40 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid1 ... 10 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2023-2DB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2023-2DB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2023-2DB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

It carries a 24 VDC coil and uses spring-type terminals for fast wiring without screw torque checks. The contactor snaps onto a 35 mm DIN rail per DIN EN 60715 and can be rotated ±180° on a vertical surface or tilted ±22.5° forward/backward, which gives panel builders flexibility in tight enclosures. At 45 mm wide and 107 mm deep, it fits standard DIN-rail spacing and leaves room for adjacent devices. The height is 85 mm.

The DC coil operates at 24 V rated value, with a pick-up/drop-out time between 15 and 17.5 ms. That 15–17.5 ms window is the mechanical response — the arcing time sits at 10 ms, so the total break time is predictable for coordination studies. The coil draws 6 A at 24 VDC inrush, settling to a lower hold current, so size your 24 VDC supply with that peak in mind. Spring-type terminals accept solid or stranded wire from 1 to 10 mm², or two conductors of 0.5 to 2.5 mm² each. That covers most control and power wiring in a typical panel — no ferrule crimping needed for solid wire, which speeds up termination on a build. Electrical switching frequency maxes out at 1,000 cycles per hour for AC-1, AC-2, AC-3, and AC-3e duty, dropping to 300 cycles per hour for AC-4 (plugging/reversing). That 300 c/h limit on AC-4 is the one that catches people out on high-cycle reversing applications.

Frequently asked questions

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

The 3RT2024-2BB40 is a higher-rated S0 frame contactor (typically 32 A vs 22 A in AC-3) with a 24 VDC coil and screw terminals instead of spring-type. It shares the same 45 mm width and 85 mm height but has a different depth and terminal layout, so a panel designed for the 3RT2023-2DB40 may need minor wiring adjustments. The spring terminals on the 3RT2023-2DB40 are the main differentiator for fast assembly.

What is the depth of the 3RT2023-2DB40?

The depth is 107 mm, measured from the DIN rail mounting surface to the front of the contactor.

What solid wire range does it accept?

It accepts solid conductors from 1 to 10 mm², and stranded from 1 to 10 mm² as well. It can also take two conductors of 0.5 to 2.5 mm² each.

Will the 3RT2023-2DB40 drop into a panel designed for 3RT2024-2BB40?

Both are S0 frame size with the same 45 mm width and 85 mm height, so they share the same DIN-rail footprint and enclosure cutout. The depth differs (107 mm vs the 3RT2024-2BB40's typical 110 mm), so clearance is fine. The main difference is terminal type — spring-type on the 3RT2023-2DB40 versus screw terminals on the 3RT2024-2BB40 — so no rewiring of the panel layout is needed, but the wiring method changes.

MPN
3RT2023-2DB40