It uses screw-type terminals for the main contacts and coil, and includes a built-in auxiliary switch. Switching frequency ratings: up to 1 000 operations per hour for AC-1 resistive loads, 750 ops/h for AC-2 and AC-3 motor duty, and 250 ops/h for AC-4 (frequent start/stop or reversing). Dimensions are 45 mm wide by 85 mm high by 97 mm deep, fitting the S0 contactor footprint.
Siemens 3RT2027-1AG20 SIRIUS Power Contactor, S0
MPN3RT2027-1AG20
Active
Siemens 3RT2027-1AG20 SIRIUS power contactor, size S0, screw terminals, 45 mm wide × 85 mm high × 97 mm deep, AC-3 max 750 ops/h.
$54.61Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Contactor frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current, AC-12, max. | 10 A |
| Rated operational current, AC-4 @ 400 V | 22 A |
| Rated value @ 400 V | 3 A |
| Rated value @ 500 V | 2 A |
| Rated value @ 690 V | 1 A |
| Rated value @ 230 V | 5 hp |
| Rated value @ 24 V | 10 A |
| Rated value @ 60 V | 2 A |
| Rated value @ 110 V | 1 A |
| Rated value @ 220 V | 0.3 A |
| Parameter | Value |
|---|---|
| Control supply voltage type | AC |
| Rated value @ 50 Hz | 0.25 |
| Rated value @ 50 Hz | 110 V |
| Parameter | Value |
|---|---|
| Main poles | 3 |
| Main NO contacts | 3 |
| Auxiliary contact reliability | 1 faulty switching per 100 million (17 V, 1 mA) |
| Parameter | Value |
|---|---|
| Short-circuit coordination type 1, fuse | gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA) |
| Short-circuit coordination type 2, fuse | gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA) |
| Aux. switch short-circuit protection, fuse | gG: 10 A (500 V, 1 kA) |
| Parameter | Value |
|---|---|
| Main circuit connection | screw-type terminals |
| Aux. / control circuit connection | screw-type terminals |
| Conductor cross-section, solid | 1 ... 10 mm² |
| Conductor cross-section, solid or stranded | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Conductor cross-section, finely stranded w/ ferrule | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Mounting method | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Side-by-side mounting | Yes |
| Parameter | Value |
|---|---|
| Durability (operating cycles, typ.) | 10 000 000 |
| Durability with aux. switch block (cycles, typ.) | 10 000 000 |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Storage temperature range | -55 ... +80 °C |
| Installation altitude, max. | 2 000 m |
| Parameter | Value |
|---|---|
| Width | 45 mm |
| Height | 85 mm |
| Depth | 97 mm |
| Parameter | Value |
|---|---|
| At AC | 4 ... 16 ms |
Product details
Frequently asked questions
What does the suffix -1AG20 mean in the Siemens 3RT2027 part number?
Decodes coil voltage, terminal type and auxiliary variant so buyers can confirm spec before purchase.
Is the Siemens 3RT2027-1AG20 still active or discontinued, and what is its successor?
Drives last-time-buy and migration decisions for stock and lifecycle managers.
What is the AC-3 kW rating, coil voltage and dimensions of the 3RT2027-1AG20?
Core selection criteria for design and panel-building; must appear in a single datasheet view.
What is the equivalent or cross-reference replacement for the 3RT2027-1AG20?
Unlocks interchangeability for MRO spares, maintenance and broker inventory.
Can a Siemens SIRIUS 3RT2027 be controlled directly from a 24 VDC PLC output?
Validates PLC I/O compatibility and coil surge suppressor requirements.
How does the 3RT2027-1AG20 differ from the 3RT2026 contactor?
Resolves sizing/upgrade ambiguity between adjacent SIRIUS S0 frame sizes.
MPN
3RT2027-1AG20