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Siemens 3RT1026-1BF40 — Contactors

Siemens 3RT1026-1BF40 SIRIUS Power Contactor, S0, 110 VDC Co

MPN3RT1026-1BF40

Siemens SIRIUS power contactor, size S0, 110 VDC coil, screw terminals, 11 kW rated motor power at 400 V AC-2, 45 mm width, active lifecycle.

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

3RT1026-1BF40 — Identification
ParameterValue
Contactor frame sizeS0
3RT1026-1BF40 — Ratings & Performance
ParameterValue
Rated operational current, AC-4 @ 400 V15.5 A
Rated value @ 400 V3 A
Rated value @ 500 V11 kW
Rated value @ 690 V11 kW
Rated value @ 230 V6 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1026-1BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT1026-1BF40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1026-1BF40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusefuse gL/gG: 100 A
Short-circuit coordination type 2, fusefuse gL/gG: 35 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT1026-1BF40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Side-by-side mountingYes
3RT1026-1BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1026-1BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
3RT1026-1BF40 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth101 mm

Product details

The 110 VDC coil pulls in at 5.4 W and holds at the same power, so the coil drive circuit needs to supply that continuously — no power-save circuit inside this model. Rated motor power hits 11 kW at 400 V in AC-2 duty (slip-ring motors, moderate overloads) and the same 11 kW at 500 V and 690 V, which covers most European-standard motor ratings up to that frame. General-use switching (AC-12) is rated at 10 A maximum, so it can handle resistive or lightly inductive control loads up to that current. The auxiliary contact block is configured as 0 instantaneous contacts — this is a main-pole-only contactor; add a separate auxiliary block if you need N/O or N/C feedback to the PLC.

Main circuit terminals are screw-type, accepting solid conductors from 2x 0.5 mm² up to max 2x 4 mm², and stranded from 2x 1 mm² up to max 2x 10 mm² (AWG equivalents: 2x 16-12 solid, 2x 14-10 stranded, 1x 8). Strip length and torque are standard for S0 screw terminals — no special tooling needed. Front face carries an IP20 rating — safe for finger-probe access in an enclosure. The terminal area itself is IP00, so the contactor must live inside a panel that provides the overall IP rating.

Short-circuit coordination and protection

Sizing the fuse to Type 2 keeps the contactor reusable after a fault — worth specifying if the panel is hard to access for replacement.

The auxiliary contact rating table covers DC switching at 24 V (10 A), 60 V (2 A), 110 V (1 A), and 220 V (0.3 A), plus AC at 230 V (6 A) and 400 V (3 A).

Frequently asked questions

What is the closest functional alternative — 3RT1023-1AL20?

The 3RT1023-1AL20 is a different coil voltage (230 VAC) and a different frame size (S00 vs S0). It will not physically drop into a panel wired for the S0 frame without changing the DIN rail footprint and rewiring the coil circuit. The 3RT1026-1BF40 is the correct S0-frame, 110 VDC coil variant.

What are the key dimensions for panel layout?

Width 45 mm, height 85 mm, depth 101 mm. Side-by-side mounting requires no gap. Maximum operating altitude is 2 000 m without derating.

What conductor sizes does the screw terminal accept?

Solid: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded: 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), max 2x 10 mm². AWG equivalents: 2x 16-12 solid, 2x 14-10 stranded, 1x 8.

MPN
3RT1026-1BF40