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Siemens 3RT2023-4BB40 — Contactors

Siemens 3RT2023-4BB40 SIRIUS Contactor, 24 VDC Coil, S0 Fram

MPN3RT2023-4BB40

Siemens SIRIUS power contactor, order code 3RT2023-4BB40, S0 frame, 24 VDC coil, screw and snap-on mounting for 35 mm DIN rail, 45 mm width.

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

Specifications

3RT2023-4BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2023-4BB40 — 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
3RT2023-4BB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2023-4BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2023-4BB40 — 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)
3RT2023-4BB40 — 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
3RT2023-4BB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2023-4BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2023-4BB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

The coil is rated for 24 VDC, and at that voltage the auxiliary contacts switch 10 A — the figure that governs your load-side wiring, not the coil draw. It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, with a width of 45 mm and depth of 107 mm — that 45 mm footprint is the S0 standard, so it drops into any panel ganged for S0 contactors without re-spacing the gland plate. The 10 mm clearance to live parts above, below, and forward is the minimum for the S0 air gap — verify your enclosure layout against those numbers before committing the BOM.

Switching frequency and duty cycles

Rated at 1,000 switching cycles per hour for AC-1 (resistive) and AC-3 (motor starting) duty, and 300/h for AC-4 (plugging/inching). The AC-3 rate covers most conveyor and pump starts; the AC-4 limit matters if the contactor sees reversing or jogging cycles — stay under 300/h there. Electrical life depends on the switched load; the AC-3 rating is your real-world wear reference.

Panel integration and mounting notes

Auxiliary contacts are present (Auxiliary Switch: Yes). The magnet coil connection is a ring cable lug — no quick-connect; factor in the lug crimp tool and ring terminal size for your wiring schedule.

Frequently asked questions

What is the width and depth of 3RT2023-4BB40?

Width is 45 mm, depth is 107 mm, height is 85 mm — standard S0 frame dimensions.

Will 3RT2023-4BB40 drop into a panel specified around 3RT2023-1BB44-ZX95?

Both are S0 frame contactors with the same 45 mm width and DIN rail mount, so the physical fit is identical — no rewiring of the gland plate or busbar spacing needed. The difference is the coil voltage: 24 VDC on the 4BB40 versus the 1BB44-ZX95's rating; verify your control transformer output before swapping.

MPN
3RT2023-4BB40