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Siemens 3RT2027-2FB40 — Contactors

Siemens 3RT2027-2FB40 SIRIUS Power Contactor, 24 VDC Coil, S

MPN3RT2027-2FB40
Active

Siemens SIRIUS power contactor, 3RT2027-2FB40, S0 size, 24 VDC coil, spring-type terminals, screw and snap-on 35 mm DIN rail mounting.

$90.17Ref. 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

3RT2027-2FB40 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-2FB40 — 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
3RT2027-2FB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2027-2FB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-2FB40 — 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)
3RT2027-2FB40 — 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 DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2027-2FB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-2FB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-2FB40 — Mechanical
ParameterValue
Width45 mm
Height102 mm
Depth107 mm

Product details

It carries a 24 VDC coil and uses spring-type terminals for the main and auxiliary circuits, so there is no screw-torque check on a fast swap — strip, push, done. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward and backward. That flexibility helps when you are squeezing it into a tight gland plate layout.

The 24 VDC coil pulls 10 A at its rated voltage, so size your control transformer and fuse accordingly — that is a healthy inrush for a DC coil, and the hold-in current will be lower, but the pick-up surge is what dictates the power supply. Switching frequency limits are given per duty class: 1 000 operations/hour at AC-1 (resistive loads), 750 at AC-2 and AC-3 (motor starting and running), and 250 at AC-4 (plugging and inching). If your application cycles a motor on and off more than 750 times an hour, this contactor will overheat — step up to a larger frame or a dedicated switching device. That -25 °C lower bound matters for unheated enclosures in northern climates — the coil must pull in reliably at cold start. Spring-type terminals accept 1 to 10 mm² solid or stranded, or 2x (0.5 to 2.5 mm²) with ferrules.

Frequently asked questions

What is the coil voltage and pickup current?

The coil is rated 24 VDC, and at that rated voltage it draws 10 A during pickup.

What wire sizes does the spring terminal accept?

The spring-type terminals accept 1 to 10 mm² solid or stranded, or 2x (0.5 to 2.5 mm²) with ferrules.

What are the switching frequency limits?

Maximum 1 000 operations/hour at AC-1, 750 at AC-2 and AC-3, and 250 at AC-4.

Does this contactor include an auxiliary switch?

Yes, it comes with an auxiliary switch built in.

MPN
3RT2027-2FB40