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Siemens 3RT2027-1AH00 — Contactors

Siemens SIRIUS 3RT2027-1AH00 Power Contactor, S0, 27 A AC-3

MPN3RT2027-1AH00
Active

Siemens SIRIUS power contactor, size S0, 3RT2027-1AH00, rated 27 A at 480 V AC-3, screw-type terminals, 45 mm width, for 35 mm DIN rail.

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

3RT2027-1AH00 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1AH00 — 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
3RT2027-1AH00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz48 V
3RT2027-1AH00 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1AH00 — 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)
3RT2027-1AH00 — 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
3RT2027-1AH00 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1AH00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1AH00 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth97 mm
3RT2027-1AH00 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

It carries a 27 A AC-3 rating at 480 V, which means it handles the inrush and running current of a three-phase induction motor up to that load — the rating that governs real-world motor switching, not the higher resistive (AC-1) figure.

That buys you options when the gland plate or busbar layout forces an odd angle.

Main contacts accept 1–10 mm² solid or stranded (two conductors per terminal: 2x 0.5–1.5 mm² or 2x 0.75–2.5 mm²).

Rated for 750 switching cycles per hour in AC-3 duty (motor start/stop), and 1000 cycles/h in AC-1 (resistive). That is typical for a general-purpose S0 contactor — adequate for conveyor, pump, and fan cycling, but not for high-speed indexing or servo-style reversals (those need AC-4 rated gear at 250 cycles/h).

Frequently asked questions

Where can I buy the 3RT2027-1AH00 and get current pricing?

It is sourced to order against an RFQ through independent distribution channels. Current pricing and availability are confirmed at quote time — submit an RFQ for a firm quote.

What is the AC-3 motor rating at 480 V for this contactor?

The 3RT2027-1AH00 is rated 27 A at 480 V AC-3, which is the rating that governs motor switching duty. That corresponds to roughly 15–20 kW at 480 V three-phase, depending on motor efficiency and power factor.

What compliance documentation does this brand provide?

The Siemens SIRIUS series carries CE marking for the European market. UL, CSA, and other regional approvals are standard for the SIRIUS line, but specific certification data for this order code should be verified from the manufacturer's declaration or nameplate.

MPN
3RT2027-1AH00