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Siemens 3RT6027-1AG20 — Contactors

Siemens 3RT6027-1AG20 SIRIUS Contactor, 27.5 kW at 400 V

MPN3RT6027-1AG20

Siemens SIRIUS 3RT6027-1AG20, Size S0 power contactor, screw terminals, 45 mm wide, 27.5 kW at 400 V 60 °C, AC-3 rated 690 V max, snap-on DIN rail.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT6027-1AG20 — Identification
ParameterValue
Contactor frame sizeS0
3RT6027-1AG20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT6027-1AG20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.25
Rated value @ 50 Hz110 V
3RT6027-1AG20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT6027-1AG20 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 100 A
Short-circuit coordination type 2, fusegL/gG LV HRC 3NA, DIAZED 5SB, NEOZED 5SE: 35 A
Aux. switch short-circuit protection, fusefuse gL/gG: 10 A
3RT6027-1AG20 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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 50022
Side-by-side mountingYes
3RT6027-1AG20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT6027-1AG20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT6027-1AG20 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth97 mm
3RT6027-1AG20 — Specifications
ParameterValue
At AC5 000 1/h

Product details

SIRIUS Size S0 power contactor for motor loads

Rated for AC-3 duty up to 690 V, this contactor delivers 27.5 kW at 400 V and 60 °C, with a 47.5 kW capability at 690 V. The 15.5 kW rating at 230 V covers lower-voltage motor circuits. The AC-3 maximum switching frequency of 750 operations per hour matches typical conveyor and pump cycling — enough for most industrial lines without oversizing.

Screw terminals accept 2x (0.5 to 1.5 mm²) solid or stranded, or 2x (0.75 to 2.5 mm²). The minimum permissible cross-section at 40 °C and 60 °C is 10 mm² for the main circuit — wire the power path with at least 10 mm² to avoid terminal overheating under full load.

Frequently asked questions

Will 3RT6027-1AG20 drop into a panel specified for 3RT6028-1AB00 without rewiring?

Both are Size S0 with the same 45 mm width and screw-terminal pattern, so the physical footprint and mounting are identical. The difference is the current rating — verify the motor FLA against the 3RT6027-1AG20's AC-3 rating before substituting.

MPN
3RT6027-1AG20