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Siemens 3RT2027-1BB40-0UA0 — Contactors

Siemens SIRIUS 3RT2027-1BB40-0UA0 Power Contactor, S0, 24 VD

MPN3RT2027-1BB40-0UA0
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Siemens SIRIUS power contactor, size S0, 24 VDC coil, screw-type terminals, auxiliary switch, 3RT2027-1BB40-0UA0.

$82.55Ref. price · indicative, final on quote
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT2027-1BB40-0UA0 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1BB40-0UA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V22 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V5 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2027-1BB40-0UA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-1BB40-0UA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1BB40-0UA0 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
Short-circuit coordination type 2, fusegG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2027-1BB40-0UA0 — 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
3RT2027-1BB40-0UA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1BB40-0UA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1BB40-0UA0 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

It snaps onto a 35 mm DIN rail per DIN EN 60715, and its mounting position is flexible — it can be rotated ±180° on a vertical surface and tilted ±22.5° forward or backward. This makes it straightforward to integrate into a control panel layout where space or orientation is tight.

The 24 VDC coil has a pickup factor of 0.8 and a drop-out factor of 1.1, meaning it pulls in reliably at 80% of nominal (19.2 V) and drops out at 110% (26.4 V). That gives you a solid hold-in margin even on a lightly loaded DC supply.

Switching Frequency and Duty Cycles

Maximum switching frequency depends on the load category: 1,000 cycles/hour for AC-1 resistive loads, 750 cycles/hour for AC-2 and AC-3 motor loads, and 250 cycles/hour for AC-4 (plugging/inching). If your conveyor zone is doing frequent reversing or jogging, stay under the AC-4 ceiling to avoid overheating the coil and contacts.

Mechanical Endurance and Temperature Range

Main contacts accept 16 to 8 AWG solid or stranded (1 to 10 mm²). Auxiliary contacts accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. That covers most control wiring from 16 AWG thermostat wire up to 8 AWG motor leads. The screw-type terminals are familiar to any panel wireman — no special tooling needed.

Clearance Requirements for Panel Layout

That 6 mm side gap is tighter than the vertical ones — if you're packing contactors side-by-side on a DIN rail, leave at least 6 mm between them for airflow and arc-chamber venting.

Frequently asked questions

What are the key dimensions of this contactor?

The contactor measures 85 mm high, 45 mm wide, and 107 mm deep. It fits the standard S0 footprint for Siemens SIRIUS contactors.

What conductor sizes does it accept?

Main contacts accept 1 to 10 mm² solid or stranded (roughly 16 to 8 AWG). Auxiliary contacts accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded.

What is the coil voltage and pickup/drop-out behavior?

The coil is rated 24 VDC. It picks up at 80% of nominal (19.2 V) and drops out at 110% (26.4 V), giving reliable operation on a standard 24 VDC supply.

MPN
3RT2027-1BB40-0UA0