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Siemens 3RT2027-1BB40 — Contactors

Siemens 3RT2027-1BB40 SIRIUS Power Contactor, 24 V Coil

MPN3RT2027-1BB40
Active

Siemens SIRIUS 3RT2027-1BB40 power contactor, size S0, 24 V DC coil, screw-type terminals, 45 mm width, 107 mm depth, 10 million mechanical cycles.

$80.01Ref. price · indicative, final on quote
Siemens 3RT2027-1BB40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2027-1BB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1BB40 — 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 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-1BB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1BB40 — 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 — 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 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1BB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1BB40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm

Product details

Panel fit and wiring constraints

The 3RT2027-1BB40: All connections use screw-type terminals, including the coil. Depth is 107 mm, height 85 mm.

Switching duty and mechanical endurance

Rated for 10 million mechanical cycles typical, with maximum operating rates varying by duty: 1,000 ops/h in AC-1 (resistive), 750 ops/h in AC-2 (slip-ring motors) and AC-3 (squirrel-cage motors), and 250 ops/h in AC-4 (plugging/inching). The AC-3e rating also caps at 750 ops/h. The coil is rated 24 V DC, with a pick-up/drop-out time of 15 to 18 ms. Arcing time is 10 ms. The coil's full-scale value is 1.1 and initial value 0.8, indicating the operating voltage tolerance band. Motor rating at 230 V is 5 hp.

MPN
3RT2027-1BB40